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Title: Catalytic performance of silicon based nanomaterials
Other Titles: Na mi gui ji cai liao de cui hua neng li
Authors: Tsang, Alpha Chi Him (曾子謙)
Department: Department of Biology and Chemistry
Degree: Doctor of Philosophy
Issue Date: 2010
Publisher: City University of Hong Kong
Subjects: Nanostructured materials.
Notes: CityU Call Number: TA418.9.N35 T75 2010
xiii, 145 leaves : ill. (some col.) 30 cm.
Thesis (Ph.D.)--City University of Hong Kong, 2010.
Includes bibliographical references (leaves 127-143)
Type: thesis
Abstract: One dimensional silicon nanomaterials have been popular gradually for optoelectronic, chemical and bio-chemical devices due to their semi-conducting ability and the convenience for chemical modification by different chemical species. In order to achieve these goals, efforts have been made regarding synthesis of silicon nanowires (SiNWs). Oxide assisted growth (OAG) and electroless etching are two of the most effective ways for large scale production of SiNWs. At the same time, silicon quantum dots (SiQDs) prepared from electrochemical etching has also been popular. In this study, the photocatalytic ability of non-modified H-SiNWs in the selective hydroxylation of benzene, decomposition of organic dyes, and reversible redox of methylene blue (MB) in alternative dark-light environment were investigated by GC-MS and UV-Vis spectroscopy respectively. The results were compared with those when catalyzed by SiQDs. Other photocatalytic properties of SiQDs were studied. Results showed that SiQDs have more stable photocatalytic capability than H-SiNWs. The catalytic ability of metal-modified SiNWs (M/SiNWs) was investigated in the oxidation of hydrocarbons under mild condition and in absence of solvents. The catalytic properties of M/SiNW arrays, in wafer scale, were also performed in the electrocatalytic oxidation of methanol. Results in both parts showed that M/SiNWs have good catalytic activity.
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