Single atom catalysts(SACs)have garnered significant attention in the field of catalysis over the past decade due to their exceptional atom utilization efficiency and distinct physical and chemical properties.For the ...Single atom catalysts(SACs)have garnered significant attention in the field of catalysis over the past decade due to their exceptional atom utilization efficiency and distinct physical and chemical properties.For the semiconductor-based electrical gas sensor,the core is the catalysis process of target gas molecules on the sensitive materials.In this context,the SACs offer great potential for highly sensitive and selective gas sensing,however,only some of the bubbles come to the surface.To facilitate practical applications,we present a comprehensive review of the preparation strategies for SACs,with a focus on overcoming the challenges of aggregation and low loading.Extensive research efforts have been devoted to investigating the gas sensing mechanism,exploring sensitive materials,optimizing device structures,and refining signal post-processing techniques.Finally,the challenges and future perspectives on the SACs based gas sensing are presented.展开更多
Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since ...Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications. In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief backgroundintroduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials(PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.展开更多
The lack of stable p-type van der Waals(vdW)semiconductors with high hole mobility severely impedes the step of low-dimensional materials entering the industrial circle.Although p-type black phosphorus(bP)and telluriu...The lack of stable p-type van der Waals(vdW)semiconductors with high hole mobility severely impedes the step of low-dimensional materials entering the industrial circle.Although p-type black phosphorus(bP)and tellurium(Te)have shown promising hole mobilities,the instability under ambient conditions of bP and relatively low hole mobility of Te remain as daunting issues.Here we report the growth of high-quality Te nanobelts on atomically flat hexagonal boron nitride(h-BN)for high-performance p-type field-effect transistors(FETs).Importantly,the Te-based FET exhibits an ultrahigh hole mobility up to 1370 cm^(2) V^(−1) s^(−1) at room temperature,that may lay the foundation for the future high-performance p-type 2D FET and metal-oxide-semiconductor(p-MOS)inverter.The vdW h-BN dielectric substrate not only provides an ultra-flat surface without dangling bonds for growth of high-quality Te nanobelts,but also reduces the scattering centers at the interface between the channel material and the dielectric layer,thus resulting in the ultrahigh hole mobility.展开更多
Combining photodynamic therapy(PDT)with chemodynamic therapy(CDT)has been proven to be a promising strategy to improve the treatment efficiency of cancer,because of the synergistic therapeutic effect arising between t...Combining photodynamic therapy(PDT)with chemodynamic therapy(CDT)has been proven to be a promising strategy to improve the treatment efficiency of cancer,because of the synergistic therapeutic effect arising between the two modalities.Herein,we report an inorganic nanoagent based on ternary NiCoTi-layered double hydroxide(NiCoTi-LDH)nanosheets to realize highly efficient photodynamic/chemodynamic synergistic therapy.The NiCoTi-LDH nanosheets exhibit oxygen vacancy-promoted electron-hole separation and photogenerated holeinduced O_(2)-independent reactive oxygen species(ROS)generation under acidic circumstances,realizing in situ pH-responsive PDT.Moreover,due to the effective conversion between Co^(3+)and Co^(2+)caused by photogenerated electrons,the NiCoTi-LDH nanosheets catalyze the release of hydroxyl radicals(-OH)from H_(2)O_(2)through Fenton reactions,resulting in CDT.Laser irradiation enhances the catalyzed ability of the NiCoTi-LDH nanosheets to promote the ROS generation,resulting in a better performance than TiO_(2)nanoparticles at pH 6.5.In vitro and in vivo experimental results show conclusively that NiCoTi-LDH nanosheets plus irradiation lead to efficient cell apoptosis and significant inhibition of tumor growth.This study reports a new pH-responsive inorganic nanoagent with oxygen vacancy-promoted photodynamic/chemodynamic synergistic performance,offering a potentially appealing clinical strategy for selective tumor elimination.展开更多
Although porphyrin-based metal-organic frameworks(MOFs)have been widely explored as photosensitizers for photodynamic therapy,how the size will affect the light-induced catalytic activity for generation of reactive ox...Although porphyrin-based metal-organic frameworks(MOFs)have been widely explored as photosensitizers for photodynamic therapy,how the size will affect the light-induced catalytic activity for generation of reactive oxygen species(ROS)still remain unclear.Herein,we first report the size-controlled synthesis of two-dimensional(2D)porphyrin-based PCN-134 MOF nanosheets by a two-step solvothermal method to explore the size effect on its PDT performance,thus yielding enhanced photodynamic antimicrobial therapy.By simply controlling the reaction temperature in the synthesis process,the bulk PCN-134 crystal,large PCN-134(L-PCN-134)nanosheets with a lateral size of 2–3μm and thickness of 33.2–37.5 nm and small PCN-134 nanosheets(S-PCN-134)with a lateral size of 160–180 nm and thickness of 9.1–9.7 nm were successfully prepared.Interestingly,the S-PCN-134 nanosheets exhibit much higher photodynamic activity for ROS generation than that of the bulk 3D PCN-134 crystal and L-PCN-134 nanosheets under a660 nm laser irradiation,suggesting that the photodynamic activity of PCN-134 MOF increases when the size reduces.Therefore,the S-PCN-134 nanosheets show much enhanced performance when used as a photosensitizer for photodynamic antimicrobial activity and wound healing.展开更多
Over the last decades,bone tissue engineering has increasingly become a research focus in the field of biomedical engineering,in which biomaterials play an important role because they can provide both biomechanical su...Over the last decades,bone tissue engineering has increasingly become a research focus in the field of biomedical engineering,in which biomaterials play an important role because they can provide both biomechanical support and osteogenic microenvironment in the process of bone regeneration.Among these biomaterials,two-dimensional(2D)nanomaterials have recently attracted considerable interest owing to their fantastic physicochemical and biological properties including great biocompatibility,excellent osteogenic capability,large specific surface area,and outstanding drug loading capacity.In this review,we summarize the state-of-the-art advances in 2D nanomaterials for bone tissue engineering.Firstly,we introduce the most explored biomaterials used in bone tissue engineering and their advantages.We then highlight the advances of cutting-edge 2D nanomaterials such as graphene and its derivatives,layered double hydroxides,black phosphorus,transition metal dichalcogenides,montmorillonite,hexagonal boron nitride,graphite phase carbon nitride,and transition metal carbonitrides(MXenes)used in bone tissue engineering.Finally,the current challenges and future prospects of 2D nanomaterials for bone tissue regeneration in process of clinical translation are discussed.展开更多
Although molybdenum trioxide nanomaterials have been widely explored as nanoagents for biomedical applications against bacteria through photothermal therapy,chemodynamic therapy,and catalytic therapy,their utilization...Although molybdenum trioxide nanomaterials have been widely explored as nanoagents for biomedical applications against bacteria through photothermal therapy,chemodynamic therapy,and catalytic therapy,their utilization as photosensitizers for photodynamic therapy(PDT)have been rarely reported so far.Herein,we report the activation of MoO_(3) nanobelts via aqueous co-intercalation of Na+and H_(2)O into their van der Waals gaps as a near-infrared Type I photosensitizer for photodynamic periodontitis treatment.The Na^(+)/H_(2)O intercalation of MoO_(3) nanobelts can shorten its length,generate rich oxygen vacancies,and enlarge its interlayer gaps.Such structural changes thus can induce the color change from white to dark blue with a strong near-infrared(NIR)absorption.When used as a photosensitizer,the I-MoO_(3−x) nanobelts exhibit much higher activities for the generation of superoxide radical(·O_(2)^(−))under an 808 nm laser irradiation than that of the pristine MoO_(3) nanobelts.Therefore,the prepared I-MoO_(3)−x nanobelts show a spectral antibacterial activity against Escherichia coli and Saccharomyces aureus,thus yielding a good clinical therapeutic effect on periodontitis.Our study proves that aqueous intercalation can be a simple but powerful strategy to activate layered MoO_(3) nanomaterials for high-performance PDT.展开更多
In the controlled synthesis of noble metal nanostructures using wet-chemical methods, normally, metal salts/complexes are used as precursors, and surfactants/ligands are used to tune/stabilize the morphology of nanost...In the controlled synthesis of noble metal nanostructures using wet-chemical methods, normally, metal salts/complexes are used as precursors, and surfactants/ligands are used to tune/stabilize the morphology of nanostructures. Here, we develop a facile electrochemical method to directly convert Pt wires to Pt concave icosahedra and nanocubes on carbon paper through the linear sweep voltammetry in a classic three-electrode electrochemical cell. The Pt wire, carbon paper and Ag/AgCl(3 mol L-1 KCl) are used as the counter, working and reference electrodes, respectively.Impressively, the formed Pt nanostructures exhibit better electrocatalytic activity towards the hydrogen evolution compared to the commercial Pt/C catalyst. This work provides a simple and effective way for direct conversion of Pt wires into well-defined Pt nanocrystals with clean surface. We believe it can also be used for preparation of other metal nanocrystals,such as Au and Pd, from their bulk materials, which could exhibit various promising applications.展开更多
Crystal phase can greatly affect the physicochemical properties and applications of nanomaterials.However,it stil remains a great challenge to synthesize nanostructures with the same composition and morphology but dif...Crystal phase can greatly affect the physicochemical properties and applications of nanomaterials.However,it stil remains a great challenge to synthesize nanostructures with the same composition and morphology but different phases in order to explore the phase-dependent properties and applications.Herein,we report the crystal phase-controlled synthesis of PtCu alloy shells on 4H Au nanoribbons(NRBs),referred to as 4H-Au NRBs,to form the 4H-Au@PtCu core-shell NRBs.By tuning the thickness of PtCu,4H-PtCu and face-centered cubic(cc)phase PICu(cc-PtCu)alloy shells are successtully grown on the 4H-Au NRB cores.This thickness-dependent phase-controlled growth strategy can also be used to grow PtCo alloys with 4H or fcc phase on 4H-Au NRBs.Significantly,when used as electrocatalysts for the ethanol oxidation reaction(EOR)in alkaline media,the 4H-Au@4H-PtCu NRBs show much better EOR performance than the 4H-Au@fcc-PtCu NRBs,and both of them possess superior performance compared to the commercial Pt black.Our study provides a strategy on phase-contolled synthesis of nanomaterials used for crystal phase-dependent applications.展开更多
Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune th...Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune their properties and then broaden their application domain,large efforts have been devoted into engineering the structures of 2D TMD nanosheets at atomic scale,especially the alloying technology.Alloying different 2D TMD nanosheets into 2D alloys not only offers the opportunities to fine-tune their physical/chemical properties,but also opens up some unique properties,which are highly desirable for wide applications including electronics,optoelectronics and catalysis.This review summarizes the recent progress in the preparation,characterization and applications of 2D alloyed TMD nanosheets.展开更多
The layered transition metal dichalcogenides(TMDs)and transition metal phosphides are low-cost,earth-abundant,and robust electrocatalysts for hydrogen evolution reaction(HER).Integrating them into hybrid nanostructure...The layered transition metal dichalcogenides(TMDs)and transition metal phosphides are low-cost,earth-abundant,and robust electrocatalysts for hydrogen evolution reaction(HER).Integrating them into hybrid nanostructures is potentially promising to further boost the catalytic activity toward HER based on their synergistic effects.Herein,we report a general method for the synthesis of a series of MoSe_(2)-based hybrid nanostructures,including MoSe_(2)-Ni_(2)P,MoSe_(2)-Co_(2)P,MoSe_(2)-Ni,MoSe_(2)-Co,and MoSe_(2)-NiS,by postgrowth of Ni_(2)P,Co_(2)P,Ni,Co,and NiS nanostructures on the presynthesized MoSe_(2) nanosheet-assembled nanospheres,respectively,via a colloidal synthesis method.As a proof-of-concept application,the as-synthesized hybrid nanostructures are used as electrocatalysts for HER,exhibiting high activity and stability in acidic media.Among them,the MoSe_(2)-Co_(2)P composite shows the highest HER activity with an overpotential of 167 mV at 10 mA cm^(-2).展开更多
Layered van der Waals(vdW)materials,consisting of atomically thin layers,are of paramount importance in physics,chemistry,and materials science owing to their unique properties and various promising applications.Howev...Layered van der Waals(vdW)materials,consisting of atomically thin layers,are of paramount importance in physics,chemistry,and materials science owing to their unique properties and various promising applications.However,their fast and large‐scale growth via a general approach is still a big challenge,severely limiting their practical implementations.Here,we report a universal method for rapid(~60 min)and large‐scale(gram scale)growth of phase‐pure,high‐crystalline layered vdW materials from their elementary powders via microwave plasma heating in sealed ampoules.This method can be used for growth of 30 compounds with different components(binary,ternary,and quaternary)and properties.The ferroelectric and transport properties of mechanically exfoliated flakes validate the high crystal quality of the grown materials.Our study provides a general strategy for the fast and large‐scale growth of layered vdW materials with appealing physiochemical properties,which could be used for various promising applications.展开更多
基金supported by the National Key Research and Development Program of China(2022YFB3204700)the National Natural Science Foundation of China(52122513)+2 种基金the Natural Science Foundation of Heilongjiang Province(YQ2021E022)the Natural Science Foundation of Chongqing(2023NSCQ-MSX2286)the Fundamental Research Funds for the Central Universities(HIT.BRET.2021010)。
文摘Single atom catalysts(SACs)have garnered significant attention in the field of catalysis over the past decade due to their exceptional atom utilization efficiency and distinct physical and chemical properties.For the semiconductor-based electrical gas sensor,the core is the catalysis process of target gas molecules on the sensitive materials.In this context,the SACs offer great potential for highly sensitive and selective gas sensing,however,only some of the bubbles come to the surface.To facilitate practical applications,we present a comprehensive review of the preparation strategies for SACs,with a focus on overcoming the challenges of aggregation and low loading.Extensive research efforts have been devoted to investigating the gas sensing mechanism,exploring sensitive materials,optimizing device structures,and refining signal post-processing techniques.Finally,the challenges and future perspectives on the SACs based gas sensing are presented.
文摘Research on two-dimensional(2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications. In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief backgroundintroduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials(PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.
基金supported by the financial supports from National Natural Science Foundation of China(Grant No.61904110)Young Teachers’Startup Fund for Scientific Research of Shenzhen University(Grant No.860-000002110426)+2 种基金the funding support from the National Natural Science Foundation of China(52122002)the Start-Up Grant(Project No.9610495)from City University of Hong KongECS scheme(City U 21201821)from the Research Grant Council of Hong Kong。
文摘The lack of stable p-type van der Waals(vdW)semiconductors with high hole mobility severely impedes the step of low-dimensional materials entering the industrial circle.Although p-type black phosphorus(bP)and tellurium(Te)have shown promising hole mobilities,the instability under ambient conditions of bP and relatively low hole mobility of Te remain as daunting issues.Here we report the growth of high-quality Te nanobelts on atomically flat hexagonal boron nitride(h-BN)for high-performance p-type field-effect transistors(FETs).Importantly,the Te-based FET exhibits an ultrahigh hole mobility up to 1370 cm^(2) V^(−1) s^(−1) at room temperature,that may lay the foundation for the future high-performance p-type 2D FET and metal-oxide-semiconductor(p-MOS)inverter.The vdW h-BN dielectric substrate not only provides an ultra-flat surface without dangling bonds for growth of high-quality Te nanobelts,but also reduces the scattering centers at the interface between the channel material and the dielectric layer,thus resulting in the ultrahigh hole mobility.
基金National Natural Science Foundation of China(21971007)the Beijing Natural Science Foundation(2212044).C.T+1 种基金thanks the funding support from the National Natural Science Foundation of China(52122002 and 22005259)the Start-Up Grant(9610495)from City University of Hong Kong.
文摘Combining photodynamic therapy(PDT)with chemodynamic therapy(CDT)has been proven to be a promising strategy to improve the treatment efficiency of cancer,because of the synergistic therapeutic effect arising between the two modalities.Herein,we report an inorganic nanoagent based on ternary NiCoTi-layered double hydroxide(NiCoTi-LDH)nanosheets to realize highly efficient photodynamic/chemodynamic synergistic therapy.The NiCoTi-LDH nanosheets exhibit oxygen vacancy-promoted electron-hole separation and photogenerated holeinduced O_(2)-independent reactive oxygen species(ROS)generation under acidic circumstances,realizing in situ pH-responsive PDT.Moreover,due to the effective conversion between Co^(3+)and Co^(2+)caused by photogenerated electrons,the NiCoTi-LDH nanosheets catalyze the release of hydroxyl radicals(-OH)from H_(2)O_(2)through Fenton reactions,resulting in CDT.Laser irradiation enhances the catalyzed ability of the NiCoTi-LDH nanosheets to promote the ROS generation,resulting in a better performance than TiO_(2)nanoparticles at pH 6.5.In vitro and in vivo experimental results show conclusively that NiCoTi-LDH nanosheets plus irradiation lead to efficient cell apoptosis and significant inhibition of tumor growth.This study reports a new pH-responsive inorganic nanoagent with oxygen vacancy-promoted photodynamic/chemodynamic synergistic performance,offering a potentially appealing clinical strategy for selective tumor elimination.
基金the funding support from the National Natural Science Foundation of China(No.52102348)the funding support from the National Natural Science Foundation of China(No.52173143)+6 种基金the funding support from the National Natural Science Foundation of China(No.22005259)the Science and Technology Innovation Talent Program of University in Henan Province(No.23HASTIT016)the funding support from China Postdoctoral Science Foundation(No.2021M701113)the Start-Up Grant(No.9610495)from City University of Hong Kongthe funding support from the National Natural Science Foundation of China(No.21905195)Natural Science Foundation of Tianjin City(No.20JCYBJC00800)the PEIYANG Young Scholars Program of Tianjin University(No.2020XRX-0023)。
文摘Although porphyrin-based metal-organic frameworks(MOFs)have been widely explored as photosensitizers for photodynamic therapy,how the size will affect the light-induced catalytic activity for generation of reactive oxygen species(ROS)still remain unclear.Herein,we first report the size-controlled synthesis of two-dimensional(2D)porphyrin-based PCN-134 MOF nanosheets by a two-step solvothermal method to explore the size effect on its PDT performance,thus yielding enhanced photodynamic antimicrobial therapy.By simply controlling the reaction temperature in the synthesis process,the bulk PCN-134 crystal,large PCN-134(L-PCN-134)nanosheets with a lateral size of 2–3μm and thickness of 33.2–37.5 nm and small PCN-134 nanosheets(S-PCN-134)with a lateral size of 160–180 nm and thickness of 9.1–9.7 nm were successfully prepared.Interestingly,the S-PCN-134 nanosheets exhibit much higher photodynamic activity for ROS generation than that of the bulk 3D PCN-134 crystal and L-PCN-134 nanosheets under a660 nm laser irradiation,suggesting that the photodynamic activity of PCN-134 MOF increases when the size reduces.Therefore,the S-PCN-134 nanosheets show much enhanced performance when used as a photosensitizer for photodynamic antimicrobial activity and wound healing.
基金support from the National Natural Science Foundation of China(NSFC:21971007)and the Beijing Natural Science Foundation(2212044).X.W thanks the funding support from the National Natural Science Foundation of China(Grant IDs:81630064 and 81871786)and National Key R&D Program of China 2018YFF0301105.C.T.thanks the funding support from the National Natural Science Foundation of China(Project Nos.22005259 and 52122002),and the Start-Up Grant(Project No.9610495)from City University of Hong Kong.
文摘Over the last decades,bone tissue engineering has increasingly become a research focus in the field of biomedical engineering,in which biomaterials play an important role because they can provide both biomechanical support and osteogenic microenvironment in the process of bone regeneration.Among these biomaterials,two-dimensional(2D)nanomaterials have recently attracted considerable interest owing to their fantastic physicochemical and biological properties including great biocompatibility,excellent osteogenic capability,large specific surface area,and outstanding drug loading capacity.In this review,we summarize the state-of-the-art advances in 2D nanomaterials for bone tissue engineering.Firstly,we introduce the most explored biomaterials used in bone tissue engineering and their advantages.We then highlight the advances of cutting-edge 2D nanomaterials such as graphene and its derivatives,layered double hydroxides,black phosphorus,transition metal dichalcogenides,montmorillonite,hexagonal boron nitride,graphite phase carbon nitride,and transition metal carbonitrides(MXenes)used in bone tissue engineering.Finally,the current challenges and future prospects of 2D nanomaterials for bone tissue regeneration in process of clinical translation are discussed.
基金This study is supported by the National Natural Science Foundation of China(Nos.52173143 and 52102348)the Science and Technology Innovation Talent Program of the University in Henan Province(No.23HASTIT016)Chaoliang Tan thanks the funding support from the National Natural Science Foundation of China-Excellent Young Scientists Fund(Hong Kong and Macao)(No.52122002).
文摘Although molybdenum trioxide nanomaterials have been widely explored as nanoagents for biomedical applications against bacteria through photothermal therapy,chemodynamic therapy,and catalytic therapy,their utilization as photosensitizers for photodynamic therapy(PDT)have been rarely reported so far.Herein,we report the activation of MoO_(3) nanobelts via aqueous co-intercalation of Na+and H_(2)O into their van der Waals gaps as a near-infrared Type I photosensitizer for photodynamic periodontitis treatment.The Na^(+)/H_(2)O intercalation of MoO_(3) nanobelts can shorten its length,generate rich oxygen vacancies,and enlarge its interlayer gaps.Such structural changes thus can induce the color change from white to dark blue with a strong near-infrared(NIR)absorption.When used as a photosensitizer,the I-MoO_(3−x) nanobelts exhibit much higher activities for the generation of superoxide radical(·O_(2)^(−))under an 808 nm laser irradiation than that of the pristine MoO_(3) nanobelts.Therefore,the prepared I-MoO_(3)−x nanobelts show a spectral antibacterial activity against Escherichia coli and Saccharomyces aureus,thus yielding a good clinical therapeutic effect on periodontitis.Our study proves that aqueous intercalation can be a simple but powerful strategy to activate layered MoO_(3) nanomaterials for high-performance PDT.
基金supported by the Ministry of Education under AcRF Tier 2 (ARC 19/15, No. MOE2014-T2-2-093 MOE2015-T2-2-057+6 种基金 MOE2016-T2-2-103 MOE2017-T2-1-162)AcRF Tier 1 (2016-T1-001-147 2016-T1-002-051 2017-T1-001-150 2017-T1-002-119)Nanyang Technological University under StartUp Grant (M4081296.070.500000) in Singapore
文摘In the controlled synthesis of noble metal nanostructures using wet-chemical methods, normally, metal salts/complexes are used as precursors, and surfactants/ligands are used to tune/stabilize the morphology of nanostructures. Here, we develop a facile electrochemical method to directly convert Pt wires to Pt concave icosahedra and nanocubes on carbon paper through the linear sweep voltammetry in a classic three-electrode electrochemical cell. The Pt wire, carbon paper and Ag/AgCl(3 mol L-1 KCl) are used as the counter, working and reference electrodes, respectively.Impressively, the formed Pt nanostructures exhibit better electrocatalytic activity towards the hydrogen evolution compared to the commercial Pt/C catalyst. This work provides a simple and effective way for direct conversion of Pt wires into well-defined Pt nanocrystals with clean surface. We believe it can also be used for preparation of other metal nanocrystals,such as Au and Pd, from their bulk materials, which could exhibit various promising applications.
基金MOE under AcRF Tier 2(Nos.MOE2016-T2-2-103 and MOE2017-T2-1-162)NTU under Start-Up Grant(No.M4081296.070.500000)in Singapore+2 种基金We would like to acknowledge the Facility for Analysis,Characterization,Testing and Simulation,Nanyang Technological University,Singapore,for use of their electron microscopy and X-ray facilities.Z.X.F.and H.Z.thank the financial support from ITC via Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM)acknowledge the start-up grants(Nos.9380100,9610480 and 7200651)grants(Nos.9610478 and 1886921)in City University of Hong Kong.
文摘Crystal phase can greatly affect the physicochemical properties and applications of nanomaterials.However,it stil remains a great challenge to synthesize nanostructures with the same composition and morphology but different phases in order to explore the phase-dependent properties and applications.Herein,we report the crystal phase-controlled synthesis of PtCu alloy shells on 4H Au nanoribbons(NRBs),referred to as 4H-Au NRBs,to form the 4H-Au@PtCu core-shell NRBs.By tuning the thickness of PtCu,4H-PtCu and face-centered cubic(cc)phase PICu(cc-PtCu)alloy shells are successtully grown on the 4H-Au NRB cores.This thickness-dependent phase-controlled growth strategy can also be used to grow PtCo alloys with 4H or fcc phase on 4H-Au NRBs.Significantly,when used as electrocatalysts for the ethanol oxidation reaction(EOR)in alkaline media,the 4H-Au@4H-PtCu NRBs show much better EOR performance than the 4H-Au@fcc-PtCu NRBs,and both of them possess superior performance compared to the commercial Pt black.Our study provides a strategy on phase-contolled synthesis of nanomaterials used for crystal phase-dependent applications.
基金the funding support from the Start-Up Grant(No.9610495)from City University of Hong KongNational Natural Science Foundation of China(No.22005259)the funding support from JSPS-KAKENHI(Nos.19K15399,21K04839)。
文摘Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune their properties and then broaden their application domain,large efforts have been devoted into engineering the structures of 2D TMD nanosheets at atomic scale,especially the alloying technology.Alloying different 2D TMD nanosheets into 2D alloys not only offers the opportunities to fine-tune their physical/chemical properties,but also opens up some unique properties,which are highly desirable for wide applications including electronics,optoelectronics and catalysis.This review summarizes the recent progress in the preparation,characterization and applications of 2D alloyed TMD nanosheets.
基金This work was supported by MOE under AcRF Tier 2(ARC 19/15,Nos.MOE2014-T2-2-093,MOE2015-T2-2-057,MOE2016-T2-2-103,and MOE2017-T2-1-162)AcRF Tier 1(2016-T1-001-147,2016-T1-002-051,2017-T1-001-150,and 2017-T1-002-119)+2 种基金Nanyang Technological University under the Start-Up Grant(M4081296.070.500000)in SingaporeS.H.thanks the support from the Fundamental Research Funds for the Central Universities(No.PA2018GDQT0013)in ChinaWe would like to acknowledge the Facility for Analysis,Characterization,Testing and Simulation,Nanyang Technological University,Singapore,for use of their electron microscopy(and/or X-ray)facilities.H.Z.thanks the support from the Innovation and Technology Commission via the Hong Kong Branch of National Precious Metals Material Engineering Research Center and the Start-Up Grant from the City University of Hong Kong.
文摘The layered transition metal dichalcogenides(TMDs)and transition metal phosphides are low-cost,earth-abundant,and robust electrocatalysts for hydrogen evolution reaction(HER).Integrating them into hybrid nanostructures is potentially promising to further boost the catalytic activity toward HER based on their synergistic effects.Herein,we report a general method for the synthesis of a series of MoSe_(2)-based hybrid nanostructures,including MoSe_(2)-Ni_(2)P,MoSe_(2)-Co_(2)P,MoSe_(2)-Ni,MoSe_(2)-Co,and MoSe_(2)-NiS,by postgrowth of Ni_(2)P,Co_(2)P,Ni,Co,and NiS nanostructures on the presynthesized MoSe_(2) nanosheet-assembled nanospheres,respectively,via a colloidal synthesis method.As a proof-of-concept application,the as-synthesized hybrid nanostructures are used as electrocatalysts for HER,exhibiting high activity and stability in acidic media.Among them,the MoSe_(2)-Co_(2)P composite shows the highest HER activity with an overpotential of 167 mV at 10 mA cm^(-2).
文摘Layered van der Waals(vdW)materials,consisting of atomically thin layers,are of paramount importance in physics,chemistry,and materials science owing to their unique properties and various promising applications.However,their fast and large‐scale growth via a general approach is still a big challenge,severely limiting their practical implementations.Here,we report a universal method for rapid(~60 min)and large‐scale(gram scale)growth of phase‐pure,high‐crystalline layered vdW materials from their elementary powders via microwave plasma heating in sealed ampoules.This method can be used for growth of 30 compounds with different components(binary,ternary,and quaternary)and properties.The ferroelectric and transport properties of mechanically exfoliated flakes validate the high crystal quality of the grown materials.Our study provides a general strategy for the fast and large‐scale growth of layered vdW materials with appealing physiochemical properties,which could be used for various promising applications.
