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Preparation and Properties of Low-dimensional Ⅱ-Ⅵ Semiconductor Nanomaterials

Author: DiGuangMei
Tutor: LiuKaiPing
School: Chang'an University
Course: Materials Science
Keywords: low-dimensionalⅡ-Ⅵgroup semiconductor nanomaterial ZnO CdSe organic matters assisted hydrothermal method reflux preparation property study
CLC: TB383.1
Type: Master's thesis
Year: 2007
Downloads: 101
Quote: 2
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Abstract


Low-dimensionalⅡ-Ⅵgroup semiconductor nanomaterials have received intensive interests due to their novel physical,chemical,and biological properties as well as the potential applications in nanodevices and bio-medicine field.Synthesis ofⅡ-Ⅵgroup semiconductor nanomaterials which morphology and size can be controlled artificially is of importance for the fundamental research and application.ZnO nanomaterials with different morphology were prepared by organic matters assisted hydrothermal method in the paper.The results of research suggested that organic matters had great influence to the morphology of samples,The samples were rod-like,slice and needle cluster ZnO respectively by adding EDTA Disodium Salt（EDTA）,cetyltrimethylammonium bromide（CTAB） and Polyacrylamide（PAM）.The samples prepared by Sodium dodecylbenzene sulfonate（SDBS）assisted hydrothermal method had irregular morphology similar to that prepared by pure hydrothermal method.The influence of the quantity of EDTA, temperature and reaction time were also studied.From supersaturation of view,combining Anion Coordination Polyhedron Growth Unity Theory and soft template theory of organic matters,we explained roughly the influence of organics to the growth of ZnO.The water-soluble CdSe QDs were also prepared using thio-ligands as capping agents by water-hath reflux method in the paper.And the CdSe with different size were got by size-selective precipitation method.The influence of thio-ligands,temperature,pH value, Cd2+/HSe- molar ratio,precursor concentration and cadmium salt to the growth of CdSe QDs were studied.The results suggested that thio-ligands,temperature,pH value and Cd2+/HSe-molar ratio had considerable influence:The crystal growth rate in the presence of mercaptoacetic acid（MAA） was faster than that in the presence of 3-mercaptopropionic acid（3-MPA）;The reaction temperature was higher,the growth rate of CdSe QDs was faster; The pH value of precursor had influence to the growth of CdSe QDs,when the pH value was 11.5,the stability of sample was best;As the Cd2+/HSe- molar ratio became bigger,the growth rate of CdSe QDs became slower.Precursor concentration and cadmium salt have little influence to the growth of CdSe QDs.

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