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Rational design of AgGaS/ZnS/ZnS quantum dots with a near-unity photoluminescence quantum yield via double shelling scheme
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作者 H.X.Lu H.Liu +5 位作者 Z.Z.Fu Y.Y.Chen H.Q.Dai Z.Hu w.l.zhang R.Q.Guo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第2期235-242,共8页
In this study,a two-step method was used to synthesize highly luminescent AgGaS/ZnS/ZnS quantum dots(QDs).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismat... In this study,a two-step method was used to synthesize highly luminescent AgGaS/ZnS/ZnS quantum dots(QDs).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer ZnS shell,thereby facilitating the formation of a thick outer shell.After the two-step shelling process,the synthesized AgGaS/ZnS/ZnS QDs showed an excellent photoluminescence quantum yield(PLQY)of 96.4%with a peak wavelength of 508 nm,repre-senting the highest PLQY reported thus far for AgGaS QDs.Furthermore,the effect of halogen ions in Zn precursors on the shelling process was investigated.It was proposed that the capacity of halogen ions to coordinate with the QDs influenced the balance between Zn cation diffusion and ZnS shelling reaction.Specifically,the ZnS shelling reaction was dominant when ZnCl_(2)was employed,while Zn cation diffusion was the dominant process under the I^(−)-rich environment.This work provides insights into the interfacial restructuring during the ZnS shelling and offers a clear map for the tailored synthesis of core/shell QDs. 展开更多
关键词 AgGaS Quantum dots PHOTOLUMINESCENCE Core/shell Alloyed core/shell interface
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Hot Corrosion Behavior of Hf-Doped NiAl Coating in the Mixed Salt of Na_(2)SO_(4)+K_(2)SO_(4)at 900℃
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作者 w.l.zhang W.Li +5 位作者 L.B.Fu X.Peng J.Sun S.M.Jiang J.Gong C.Sun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2023年第9期1409-1420,共12页
The hot corrosion behavior of the NiAl coating and the 5Hf-NiAl coating induced by mixed salt at 900℃was investigated.Comparing with the NiAl coating,the 5Hf-NiAl coating exhibited superior hot corrosion resistance b... The hot corrosion behavior of the NiAl coating and the 5Hf-NiAl coating induced by mixed salt at 900℃was investigated.Comparing with the NiAl coating,the 5Hf-NiAl coating exhibited superior hot corrosion resistance because the addition of Hf promoted the formation of protective oxide scale and reduced the growth rate of oxide scale.Therefore,internal sulfides were not present in the 5Hf-NiAl coating after hot corrosion for 140 h.Cr exhibited different distribution in the two coatings since the addition of Hf changed the hot corrosion process of the coating.Hf and Ti in the 5Hf-NiAl coating trapped and captured sulfur,preventing the penetration of sulfur into the coating.The hot corrosion mechanism of the two coating and the effects of Hf on this process were discussed in this work. 展开更多
关键词 Hot corrosion HAFNIUM Oxide scale TITANIUM SULFIDE
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Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings 被引量:4
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作者 w.l.zhang Y.B.Song +3 位作者 X.P.Zeng R.Ma Z.J.Yang Y.J.Rao 《Photonics Research》 SCIE EI 2016年第3期102-105,共4页
In this paper, we proposed a way to realize an Er-doped random fiber laser(RFL) with a disordered fiber Bragg grating(FBG) array, as well as to control the lasing mode of the RFL by heating specific locations of the d... In this paper, we proposed a way to realize an Er-doped random fiber laser(RFL) with a disordered fiber Bragg grating(FBG) array, as well as to control the lasing mode of the RFL by heating specific locations of the disordered FBG array. The disordered FBG array performs as both the gain medium and random distributed reflectors, which together with a tunable point reflector form the RFL. Coherent multi-mode random lasing is obtained with a threshold of between 7.5 and 10 mW and a power efficiency between 23% and 27% when the reflectivity of the point reflector changes from 4% to 50%. To control the lasing mode of random emission, a specific point of the disordered FBG array is heated so as to shift the wavelength of the FBG(s) at this point away from the other FBGs.Thus, different resonance cavities are formed, and the lasing mode can be controlled by changing the location of the heating point. 展开更多
关键词 MODE Temperature-controlled mode selection of Er-doped random fiber laser with disordered Bragg gratings
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Formation process and oxidation behavior of MCrAlY+AlSiY composite coatings on a Ni-based superalloy 被引量:1
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作者 S.M.Li L.B.Fu +6 位作者 w.l.zhang W.Li J.Sun T.G.Wang S.M.Jiang J.Gong C.Sun 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第25期65-77,共13页
An AlSiY coating and two MCrAlY+AlSiY composite coatings with different thickness of MCrAlY interlayer were prepared by arc ion plating(AIP)and vacuum annealing.The isothermal oxidation behavior of coatings at 1100℃ ... An AlSiY coating and two MCrAlY+AlSiY composite coatings with different thickness of MCrAlY interlayer were prepared by arc ion plating(AIP)and vacuum annealing.The isothermal oxidation behavior of coatings at 1100℃ for 300 h was also investigated to characterize the microstructure evolution of coatings during annealing.The composite coatings exhibited a better high-temperature oxidation resistance at 1100℃ .The reason is that the addition of MCrAlY layer can greatly contribute to prevent the diffusion of refractory elements to the outer layer.The inhibition of Al inward diffusion can be much stronger,as the Si content increases in the outer layer during annealing. 展开更多
关键词 Composite coating ANNEALING Arc ion plating SEM OXIDATION
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Generation of cascaded four-wave-mixing with graphene-coated microfiber 被引量:1
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作者 Y.Wu B.C.Yao +8 位作者 Q.Y.Feng X.L.Cao X.Y.Zhou Y.J.Rao Y.Gong w.l.zhang Z.G.Wang Y.F.Chen K.S.Chiang 《Photonics Research》 SCIE EI 2015年第2期64-68,共5页
A graphene-coated microfiber(GCM)-based hybrid waveguide structure formed by wrapping monolayer graphene around a microfiber with length of several millimeters is pumped by a nanosecond laser at ~1550 nm, and multiord... A graphene-coated microfiber(GCM)-based hybrid waveguide structure formed by wrapping monolayer graphene around a microfiber with length of several millimeters is pumped by a nanosecond laser at ~1550 nm, and multiorder cascaded four-wave-mixing(FWM) is effectively generated. By optimizing both the detuning and the pump power, such a GCM device with high nonlinearity and compact size would have potential for a wide range of FWM applications, such as phase-sensitive amplification, multi-wavelength filter, all-optical regeneration and frequency conversion, and so on. 展开更多
关键词 GCM FWM Generation of cascaded four-wave-mixing with graphene-coated microfiber wave
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