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Journal of NanomaterialsVolume 2009 2009, Article ID 384601, 6 pages

Research ArticleDepartment of Electrical Engineering, Graduate Institute of Photonics and Optoelectronics, National Taiwan University, 1 Roosevelt Road Section 4, Taipei 10617, Taiwan

Received 11 May 2009; Accepted 31 August 2009

Academic Editor: Y. Wang

Copyright © 2009 Yi-Hao Pai and Gong-Ru Lin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electrochemical characterization of the uniformly dispersed Pt and Ag nanodots synthesized after in situ scalable electron-beam reduction on copper grid and carbon-fiber electrode is demonstrated. By employing plasma pretreatment to produce functional organosilicon micronetworks-based reaction sites on copper grid, the size and standard deviation of the electrochemically reduced metallic nanodots can be strictly confined. When detuning the accelerating voltage of electron-beam from 3 to 120 kV, the reshaped nanodot diameter enlarges from to  nm due to the gradual self-aggregation. In comparison with sputtering method, the electroactivity of Pt nanodot covered carbon fiber electrode obtained after electron-beam reduction exhibits a larger electroactive surface of 16.56 -mg. The electron-beam reduction provides a better dispersion of the reduced Pt nanodots based catalysts on carbon-fiber electrode, promoting the utilization efficiency of these nanoscale catalyst defined as the ratio of electroactive to geometric area from 2.5% to 7%.





Autor: Yi-Hao Pai and Gong-Ru Lin

Fuente: https://www.hindawi.com/



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