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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Noninjection Synthesis of CdS and Alloyed CdSxSe12x Nanocrystals Without Nucleation Initiators | Nanoscale Res Lett 2010 5 966-971 DOI 10.1007 s11671-010-9593-2 NANO EXPRESS Noninjection Synthesis of CdS and Alloyed CdSxSei-x Nanocrystals Without Nucleation Initiators Yu Zou Dongsheng Li Deren Yang Received 11 March 2010 Accepted 27 March 2010 Published online 11 April 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract CdS and alloyed CdSxSe1-x nanocrystals were prepared by a simple noninjection method without nucleation initiators. Oleic acid OA was used to stabilize the growth of the CdS nanocrystals. The size of the CdS nanocrystals can be tuned by changing the OA Cd molar ratios. On the basis of the successful synthesis of CdS nanocrystals alloyed CdSxSe1-x nanocrystals can also be prepared by simply replacing certain amount of S precursor with equal amount of Se precursor verified by TEM XRD EDX as well as UV-Vis absorption analysis. The optical properties of the alloyed CdSxSe1-x nanocrystals can be tuned by adjusting the S Se feed molar ratios. This synthetic approach developed is highly reproducible and can be readily scaled up for potential industrial production. Keywords Nanocrystals CdS CdSxSe1-x Noninjection synthesis Oleic acid Introduction Colloidal semiconductor nanocrystals have been intensively studied due to their unique physical properties. They exhibit quantum confinement effect such as size-dependent optical and electric properties for applications in optoelectronic devices 1-3 and biological fluorescence labeling 4 5 . CdS with a bulk band gap of 2.42 eV 512 nm and exciton Bohr radius of 3 nm is a candidate for quantum-dot blue light-emitting diodes 6 and Y. Zou D. Li D. Yang State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering Zhejiang University 310027 Hangzhou People s Republic of China e-mail mselds@zju.edu.cn can be used in photovoltaic devices 7 . In order to tune the optical properties of CdS quantum dots for specific applications two schemes have
