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Preparation and Optical Properties of Semiconductor Nanocrystals through Chemical Process

Author: JiangZuoZuo
Tutor: TanGuoLong
School: Wuhan University of Technology
Course: Materials Science
Keywords: Semiconductor Nanocrystals Microstructure Optical Properties
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 71
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Abstract


Due to the excellent physical and chemical properties of the nanoscale semiconductor, and the potential application in the optoelectronic component, electrochemistry, nano mechanism and biologic component, the semiconductor nanocrystals have been one of the hot spots in the field of physical, chemical, and biological materials. This paper focuses on the synthesis of Se nanocrystals by the a facile chemical method, meanwhile, the CdSe1-χSχ (0<x<1), CuSe, Cu2-χSe, Cu2Se nanocrystals could be also synthesized by the same method. The main contents are demonstrated as follows:1. Se nanocrystals have been successfully synthesized by a chemical process. The X-ray diffraction (XRD) pattern shows that the major phase of the product was hexagonal Se. High-resolution transmission electron microscopy (HRTEM) images confirmed the hexagonal structure of Se nanocrystals. The size of Se nanocrystals ranges from2to6nm. The Se nanocrystals shows homegeneous size distribution. The solution of the Se nanocrystals exhibits red colour, and the absorption peaks for the Se nanocrystals locate within the range of540to630nm by the UV-vis absorption spectroscopy.2. CdSe1-χSχ(0<x<1) nanocrystals have been successfully synthesized by a chemical process. XRD and HRTEM images confirm the formation of CdSe1-χSχ(0<x<1) nanocrystals in zinc blende structure, and the size of Se nanocrystals ranges from3to6nm. The UV-vis spectra of as-prepared CdSe1-χSχ(0<x<1) nanocrystals are tunable from330nm to440nm, which blue shifts to shorter wavelength side in comparison with that of pure CdSe nanocrystals. The cubic CdSe1-χSχ(0<x<1) nanocrystals demonstrate narrow PL emissions spectra between464and615nm, being tunable upon particle size. Transmission electron microscopy images show the uniformity for the size distribution of the ternary QDs.3. CuSe, Cu2-χSe, Cu2Se nanocrystals have been successfully synthesized by a chemical simple way. HR-TEM images confirmed that CuSe, Cu2-χSe, nanocrystals were hexagonal and cubic respectively. The size of the nanocrysfals are between2to5nm. The as-prepared CuSe, Cu2-χSe, Cu2Se nanocrystals were measured by UV-visible spectroscopy. The samples show that absorption peaks appeared at372nm,496nm,781nm.

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