Open Access Nano Express

Size-Controlled Synthesis of Colloidal Gold Nanoparticles at Room Temperature Under the Influence of Glow Discharge

Xi Liang12, Zhou-jun Wang13 and Chang-jun Liu1*

Author Affiliations

1 Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, 300072, Tianjin, People’s Republic of China

2 Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, TX, 77005-1892, USA

3 Department of Chemistry, Texas A & M University, College Station, TX, 77843-3255, USA

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Nanoscale Research Letters 2009, 5:124-129  doi:10.1007/s11671-009-9453-0

Published: 10 October 2009

Abstract

Highly dispersed colloidal gold (Au) nanoparticles were synthesized at room temperature using glow discharge plasma within only 5 min. The prepared Au colloids were characterized with UV–visible absorption spectra (UV–vis), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) equipped with an energy dispersion X-ray spectrometer (EDX). UV–vis, XPS and EDX results confirmed that Au3+ ions in HAuCl4 solution could be effectively reduced into the metallic state at room temperature with the glow discharge plasma. TEM images showed that Au nanoparticles were highly dispersed. The size of colloidal Au nanoparticles could be easily tuned in the nanometer range by adjusting the initial concentration of HAuCl4 solution. Moreover, the as-synthesized Au colloids (dav = 3.64 nm) exhibited good catalytic activity for glucose oxidation. The nucleation and growth of colloidal Au particles under the influence of the plasma was closely related with the high-energy electrons generated by glow discharge plasma.

Keywords:
Size; Au colloids; Plasma; Reduction; Glucose oxidation