Size-controlled synthesis of gold nanoparticles from bulk gold substrates by sonoelectrochemical methods

Yu Chuan Liu, Li Huei Lin, Wen H. Chiu

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Size-controlled gold nanoparticles, ranging from 2 to 15 nm in diameter, were first prepared from gold substrates in 0.1 N HCl aqueous solutions without the addition of any stabilizers by sonoelectrochemical methods. First, an Au substrate was cycled in a deoxygenated aqueous solution containing 0.1 N HCl from -0.28 to + 1.22 V vs Ag/AgCl at 500 mV/s with 100 scans. The durations at the cathodic and anodic vertexes are 10 and 5 s, respectively. After this process, Au- and Cl-containing complexes were left in the solution. The Au working electrode was then immediately replaced by a Pt electrode, and cathodic over-potentials of 0.2, 0.4, and 0.6 V from the open circuit potential (OCP) of ca. 0.82 V vs Ag/AgCl were applied under sonification to synthesize Au nanoparticles. The prepared nanoparticles increase in size from 2 to 15 nm with the increase of the cathodic overpotential applied from 0.2 to 0.6 V. Furthermore, the ratio of Au nanoparticles to Aucontaining nanocomplexes in solutions can be controlled by adjusting the sonoelectrochemical reduction time.

Original languageEnglish
Pages (from-to)19237-19240
Number of pages4
JournalJournal of Physical Chemistry B
Volume108
Issue number50
DOIs
Publication statusPublished - Dec 16 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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