New pathway for the synthesis of ultrafine silver nanoparticles from bulk silver substrates in aqueous solutions by sonoelectrochemical methods

Yu Chuan Liu, Li Huei Lin

研究成果: 雜誌貢獻文章同行評審

173 引文 斯高帕斯(Scopus)

摘要

Ultrafine silver nanoparticles with diameters less than 2 nm were first prepared in 0.1 M HCl aqueous solutions without addition of any stabilizer by sonoelectrochemical methods from silver substrates. First, an Ag substrate was cycled in a deoxygenated aqueous solution containing 0.1 M HCl from -0.30 to +0.30 V vs Ag/AgCl at 5 mV/s with 30 scans. After that Ag- and Cl-containing complexes were found existing in this aqueous solution. Then the Ag working electrode was immediately replaced by a Pt electrode and a cathodic overpotential of 0.2 V was applied under sonication to synthesize Ag nanoparticles. The resulting Ag nanoparticles are too small to exhibit any surface plasmon absorption, as illustrated in the UV-Vis absorption spectrum. An interesting phenomenon was also found from X-ray photoelectron spectroscopy (XPS) analyses that the binding energy of the prepared Ag nanoparticles shifts towards a higher value by ca. 0.2 eV, as compared with that of the employed Ag substrates. Furthermore, the particle sizes of the prepared Ag nanoparticles can be increased from less than 2 to 20 nm by increasing the cathodic overpotential applied from 0.2 to 0.8 V.

原文英語
頁(從 - 到)1163-1168
頁數6
期刊Electrochemistry Communications
6
發行號11
DOIs
出版狀態已發佈 - 十一月 2004
對外發佈

ASJC Scopus subject areas

  • 化學工程 (全部)
  • 分析化學
  • 電化學

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