| Summary: | 碩士 === 淡江大學 === 化學學系碩士班 === 99 === Several protecting molecules were employed to modify the surface of gold nanoparticles (AuNPs). The extra functional groups of the protecting thiol molecules used are both carboxylice acid and alkane in the other end. DL-mercaptosuccinic acid, meso-2,3-dimercaptosuccinic acid, and 4-mercaptobenzoic acid are included in the former. The latter contains of 1-butanethiol and 1-dodecanethiol. Furthermore, the activities of the thiol-protected gold nanoparticles were studied in redox reactions. MSA irreversibly desorbed from the surface of the AuNPs in the process. But the similar phenomenon could not be observed for 1-butanethiol and 1-dodecanethiol. In the thiol-exchange reaction for free thiol in solution and thiol-protected AuNPs, alkyl thiol-modified gold nanoparticles did not exchange with the free MSA, but a product of dithiol could be formed. The formation of could be related to both gold nanoparticles and O2. Finally, the catalytic experiments show that AuNPs has the highest catalytic activity compared with MSA-modified AuNPs and alkyl-thiol modified AuNPs with the poor activity.
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