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Surface effects of monolayer-protected gold nanoparticles on the redox reactions between ferricyanide and thiosulfate |
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| Authors: | Di?Li Chunyan?Sun Yunjie?Huang |
| Institution: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China 2. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;Department of Chemistry, Tsinghua University, Beijing 100084, China 3. Department of Chemistry, University of California, Santa Cruz, Santa Cruz, CA 95064, USA |
| Abstract: | Electron transfer through the self-assembled monolayers (SAMs) on gold nanopar-ticles is investigated by using the monolayer protected gold nanoclusters (MPCs) as elec-tron-transfer mediators. 3-Mercaptopropionic acid (MPA) and 11-meraptoundecanoic acid (MUA) MPCs were employed to catalyze the redox reaction between potassium ferricyanide and sodium thiosulfate. The catalytic mechanism was proposed that the MPCs act as diffusing elec-tron-mediators and electron transfers to and from the MPCs surface. Therefore the electron transfer rate through the capping layers would be proportional to the MPCs catalyzed reaction rate, which was monitored by the UV absorbance of ferricyanide. The calculated apparent rate constant was orders of magnitude smaller than that of the maximum of tunneling current, which was attributed to the splited energy level of the nanoscale particles. |
| Keywords: | electron transfer three-dimensional self-assembled monolayers redox reaction electron transfer mediator sur-face effect |
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