Most electronics such as sensors,actuators and energy harvesters need piezoceramic films to interconvert mechanical and electrical energy.Transferring the ceramic films from their growth substrates for assembling elec...Most electronics such as sensors,actuators and energy harvesters need piezoceramic films to interconvert mechanical and electrical energy.Transferring the ceramic films from their growth substrates for assembling electronic devices commonly requires chemical or physical etching,which comes at the sacrifice of the substrate materials,film cracks,and environmental contamination.Here,we introduce a van der Waals stripping method to fabricate large-area and freestanding piezoceramic thin films in a simple,green,and cost-effective manner.The introduction of the quasi van der Waals epitaxial platinum layer enables the capillary force of water to drive the separation process of the film and substrate interface.The fabricated lead-free film,Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)(BCZT),shows a high piezoelectric coefficient d_(33)=209±10 pm V−1 and outstanding flexibility of maximum strain 2%.The freestanding feature enables a wide application scenario,including micro energy harvesting,and covid-19 spike protein detection.We further conduct a life cycle analysis and quantify the low energy consumption and low pollution of the water-based stripping film method.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
Capillary‐enabled water energy harvesters(WEHs)are capable of generating directcurrent electricity continuously.However,active‐metal electrodes can introduce metal–air batteries in these WEHs.Given the nearly ident...Capillary‐enabled water energy harvesters(WEHs)are capable of generating directcurrent electricity continuously.However,active‐metal electrodes can introduce metal–air batteries in these WEHs.Given the nearly identical device structures and output characteristics of these two technologies,it is essential to distinguish between them.Herein,we present a systematic study of the water‐activated metal–air battery(WMB)through theoretical analyses and experimental verifications.We conclude the general formation rules of the WMB from a material and device‐structure perspective.Furthermore,we provide a comparative summary of various WEHs and WMBs for easy identification.We aim to improve the comprehension of metal–air batteries in the field of WEHs and assist in distinguishing between these technologies.展开更多
Nowadays, DNA-mediated metal nanomaterials have received more and more attention due to their distinctive properties of easy synthesis, high stability and good biocompatibility. As a kind of efficient template to medi...Nowadays, DNA-mediated metal nanomaterials have received more and more attention due to their distinctive properties of easy synthesis, high stability and good biocompatibility. As a kind of efficient template to mediate the precise synthesis of metal nanomaterials, DNA can not only increase their recognition and biocompatibility, but also precisely control their morphology, structure and further analytical performance. DNA-mediated metal nanomaterials as ultrasensitive and selective probes have unique advantages for in situ rapid analysis of targets in complex samples. Herein, we reviewed the recent progress on synthesis strategies, morphologies, specific properties of DNA-mediated metal nanomaterials including nanoparticles and nanoclusters. Moreover, the applications of DNA-mediated metal nanomaterials to environmental and biological analysis were also summarized. Finally, the developing prospect of DNA-mediated metal nanomaterials in analytical chemistry was discussed and proposed.展开更多
Surface-enhanced Raman scattering(SERS)spectroscopy has been employed as a rapid analysis technology for food security inspection recently.Nowadays,it is still a great challenge to rapidly quantify multiple trace anti...Surface-enhanced Raman scattering(SERS)spectroscopy has been employed as a rapid analysis technology for food security inspection recently.Nowadays,it is still a great challenge to rapidly quantify multiple trace antibiotics potentially abused in aquaculture industry.In this work,a magnetic Ti_(3)C_(2)T_(x)/Fe_(3)O_(4)/Ag substrate was prepared for the development of a reliable rapid SERS quantification method for multiple trace sulfonamides in aquatic products.This magnetic substrate had good uniformity,reproducibility,stability and SERS activity.Moreover,this substrate could integrate the magnetic separation-enrichment and matrix clean-up without cross contamination,which endowed it with good selectivity and antiinterference capability during real sample analysis.The electromagnetic enhancement and chemical enhancement mechanism of this magnetic substrate were studied in detail to reveal its good separationenrichment performance and SERS activity.Finally,a rapid SERS quantification method was established and practically applied for trace phthalic sulfathiazole(PST)and silver sulfadiazine(SSD)in aquatic products by using Ti_(3)C_(2)T_(x)/Fe_(3)O_(4)/Ag magnetic substrates.Trace PST and SSD could be actually detected and quantified as 55.9μg/kg and 64.0μg/kg in aquatic products,respectively.Good recoveries of 83.9%-116%with relative standard deviations(RSDs)of 0.5%-3.2%for PST and 80.2%-102%with RSDs of 1.3%-5.8%for SSD were obtained.This work proposed an efficient and reliable method for rapid quantification of trace multiple sulfonamides in complex aquatic samples during food security inspection.展开更多
基金supported by General Research Grant(Project No.11212021,No.11210822)Early Career Scheme(Project No.CityU 21210619)from the Research Grants Council of the Hong Kong Special Administrative Regionthe Innovation and Technology Fund(ITS/065/20,GHP/096/19SZ)from the Innovation and Technology Commission of the Hong Kong Special Administrative Region.
文摘Most electronics such as sensors,actuators and energy harvesters need piezoceramic films to interconvert mechanical and electrical energy.Transferring the ceramic films from their growth substrates for assembling electronic devices commonly requires chemical or physical etching,which comes at the sacrifice of the substrate materials,film cracks,and environmental contamination.Here,we introduce a van der Waals stripping method to fabricate large-area and freestanding piezoceramic thin films in a simple,green,and cost-effective manner.The introduction of the quasi van der Waals epitaxial platinum layer enables the capillary force of water to drive the separation process of the film and substrate interface.The fabricated lead-free film,Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)(BCZT),shows a high piezoelectric coefficient d_(33)=209±10 pm V−1 and outstanding flexibility of maximum strain 2%.The freestanding feature enables a wide application scenario,including micro energy harvesting,and covid-19 spike protein detection.We further conduct a life cycle analysis and quantify the low energy consumption and low pollution of the water-based stripping film method.
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Research Grants Council of Hong Kong,Grant/Award Numbers:11212021,11210822。
文摘Capillary‐enabled water energy harvesters(WEHs)are capable of generating directcurrent electricity continuously.However,active‐metal electrodes can introduce metal–air batteries in these WEHs.Given the nearly identical device structures and output characteristics of these two technologies,it is essential to distinguish between them.Herein,we present a systematic study of the water‐activated metal–air battery(WMB)through theoretical analyses and experimental verifications.We conclude the general formation rules of the WMB from a material and device‐structure perspective.Furthermore,we provide a comparative summary of various WEHs and WMBs for easy identification.We aim to improve the comprehension of metal–air batteries in the field of WEHs and assist in distinguishing between these technologies.
基金supported by the National Natural Science Foundation of China(Nos.21475154,21475153 and 21675178)the Special Funds for Public Welfare Research and Capacity Building in Guangdong Province of China(No. 2015A030401036)the Guangzhou Science and Technology Program of China(No. 201604020165),respectively
文摘Nowadays, DNA-mediated metal nanomaterials have received more and more attention due to their distinctive properties of easy synthesis, high stability and good biocompatibility. As a kind of efficient template to mediate the precise synthesis of metal nanomaterials, DNA can not only increase their recognition and biocompatibility, but also precisely control their morphology, structure and further analytical performance. DNA-mediated metal nanomaterials as ultrasensitive and selective probes have unique advantages for in situ rapid analysis of targets in complex samples. Herein, we reviewed the recent progress on synthesis strategies, morphologies, specific properties of DNA-mediated metal nanomaterials including nanoparticles and nanoclusters. Moreover, the applications of DNA-mediated metal nanomaterials to environmental and biological analysis were also summarized. Finally, the developing prospect of DNA-mediated metal nanomaterials in analytical chemistry was discussed and proposed.
基金financially supported by the National Natural Science Foundation of China(Nos.22074161 and 21976213)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515010107)+3 种基金the Science and Technology Planning Project of Guangzhou City(No.202102080167)the Research and Development Plan for Key Areas of Food Safety in Guangdong Province of China(No.2019B020211001)the National Key Research and Development Program of China(No.2019YFC1606101)the State Key Program of National Natural Science of China(No.22134007)。
文摘Surface-enhanced Raman scattering(SERS)spectroscopy has been employed as a rapid analysis technology for food security inspection recently.Nowadays,it is still a great challenge to rapidly quantify multiple trace antibiotics potentially abused in aquaculture industry.In this work,a magnetic Ti_(3)C_(2)T_(x)/Fe_(3)O_(4)/Ag substrate was prepared for the development of a reliable rapid SERS quantification method for multiple trace sulfonamides in aquatic products.This magnetic substrate had good uniformity,reproducibility,stability and SERS activity.Moreover,this substrate could integrate the magnetic separation-enrichment and matrix clean-up without cross contamination,which endowed it with good selectivity and antiinterference capability during real sample analysis.The electromagnetic enhancement and chemical enhancement mechanism of this magnetic substrate were studied in detail to reveal its good separationenrichment performance and SERS activity.Finally,a rapid SERS quantification method was established and practically applied for trace phthalic sulfathiazole(PST)and silver sulfadiazine(SSD)in aquatic products by using Ti_(3)C_(2)T_(x)/Fe_(3)O_(4)/Ag magnetic substrates.Trace PST and SSD could be actually detected and quantified as 55.9μg/kg and 64.0μg/kg in aquatic products,respectively.Good recoveries of 83.9%-116%with relative standard deviations(RSDs)of 0.5%-3.2%for PST and 80.2%-102%with RSDs of 1.3%-5.8%for SSD were obtained.This work proposed an efficient and reliable method for rapid quantification of trace multiple sulfonamides in complex aquatic samples during food security inspection.
