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Realizing zinc blende GaAs/AlGaAs Axial and Radial Heterostructure Nanowires by Tuning the Growth Temperature

Journal of Materials Science & Technology 2011年第6期27卷 507-512页

作者： Jingwei Cuo Hui Huang Xiaomin Ren Xin Yan Shiwei Cai Wei Wang Yongqing Huang Qi Wang and Xi Zhang Key Laboratory of Information Photonics & Optical Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Vertical zinc blende GaAs/AlGaAs heterostructure nanowires were grown at different temperatures by metalorganic chemical vapor deposition via Au-assisted vapor-liquid-solid *** was found that radial growth can be enhanced by increasing the growth *** growth of radial heterostructure can be realized at temperature higher than 500℃,while the growth temperature of axial heterostructure is lower than 440℃.The room temperature photoluminescence properties of the nanowires were investigated and the relevant growth mechanism was discussed.

关键词： Nanowire GaAs AlGaAs Heterostructure zinc blende

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Surface saturation control on the formation of wurtzite polytypes in zinc blende SiC nanofilms grown on Si-(100) substrates

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Chinese Physics B 2013年第8期22卷 542-546页

作者：刘兴昉孙国胜刘斌闫果果关敏张杨张峰董林郑柳刘胜北田丽欣王雷赵万顺曾一平 Key Laboratory of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences

We investigate the formations of wurtzite （WZ） SiC nano polytypes in zinc blende （ZB） SiC nanofilms hetero-grown on Si-（100） substrates via low pressure chemical vapor deposition （LPCVD） by adjusting the Si/C ratio of the introduced precursors. Through SEM, TEM, and Raman characterizations, we find that the nanofilms consist of discrete WZ SiC nano polytypes and ZB SiC polytypes composed of WZ polytypes （WZ ＋ ZB） and disordered ZB SiC polytypes, respectively, according to Si/C ratios of 0.5, 1.5, and 3. We attribute the WZ polytype formation to being due to a kinetic mechanism based on the Si/C surface saturation control.

关键词： SiC wurtzite zinc blende nanofilm

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Synthesis of zinc blende CdTe Nanocrystals and Facile Shape Conversion from Multipods to Dot-shaped Particles

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Chemical Research in Chinese Universities 2011年第5期27卷 739-741页

作者： SHEN Huai-bin XING Ming LI Lin-song WANG Hong-zhe CHEN Xia College of Life Science Jilin University Changchun 130012 P. R. China Key Laboratory for Special Functional Materials Ministry of Education Henan University Kaifeng 475004 P. R. China

Branched CdTe nanocrystals with zinc blende structure were directly synthesized in the early growth stage at a high initial concentration of cadmium precursor and a high molar ratio of Cd precursor to Te precuesor. Activation of the cadmium precursor by octadecylamine was found to be critical for the formation of branched CdTe nanocrystals. Furthermore, these as-prepared CdTe nanocrystals can evolve into nearly monodisperse dots through Ostwald ripening and still keep strong photoluminescence. These results manifest a new route to synthesize branch- and dot-shaped CdTe nanocrystals with zinc blende structure.

关键词： CdTe zinc blende Branch-shaped nanocrystal

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CdS quantum dot aerogels for photocatalytic hydrogen evolution

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Nano Research 2024年第12期17卷 10292-10301页

作者： Vinicius Alevato Daniel Streater Cole Premtaj Jier Huang Stephanie L.Brock Department of Chemistry Wayne State UniversityDetroitMI 48202USA Department of Chemistry Marquette UniversityMilwaukeeWI 53201USA Department of Chemistry&Shiller Institute for Integrated Science and Society Boston CollegeBostonMA 02467USA

CdS quantum dots(QDs)have been extensively studied as photocatalysts and sensitizers for visible-light-driven water ***,their efficiencies are limited by the need to accumulate sufficient redox equivalents to produce_(H2)and consequent photocorrosion associated with slow hole-transfer *** address these limitations,we report the formation of CdS QD assemblies(aerogels,AGs)capable of facilitating energy/charge transport between individual QDs,and evaluate their performance as photocatalysts for hydrogen evolution as a function of structure,wurtzite(w-)***(zb-),and different annealing *** formation of AGs from QDs resulted in increased rates of_(H2)production under visible light illumination:from 1458(QD)to 6650(AG)μmol_(H2)·h^(-1)·g^(-1)on zbCdS and from 1221(QD)to 3325(AG)μmol_(H2)·h^(-1)·g^(-1)on *** is attributed to exciton delocalization between adjacent QDs facilitating charge/energy *** processing of CdS AGs up to 250℃ improved their activity,increasing the degree of exciton delocalization,while annealing them to 300℃ caused sintering of the primary QD particles within the AGs and a decrease in activity associated with loss in surface *** best photocatalyst,zbCdS AG annealed at 250℃,had an average_(H2)production rate of 13,604±2017μmol_(H2)·h^(-1)·g^(-1),an apparent quantum yield of 2.8%at 425±12.5 nm,and was stable for 2 h before beginning to deactivate due to *** study confirms the potential of CdS AGs as matrixes for the design of more active and stable composite photocatalysts for water splitting.

关键词： sol-gel chemistry photocorrosion apparent quantum yield wurtzite zinc blende

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