Journal of Materials Research

Articles

Controlled Growth of Gold Nanoparticles on Silica Nanowires

Aaron D. LaLondea1, M. Grant Nortona1, Daqing Zhanga2, Devananda Gangadeana2, Abdullah Alkhateeba2, Radhakrishnan Padmanabhana2 and David N. McIlroya2

a1 School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920

a2 Department of Physics, University of Idaho, Moscow, Idaho 83844-0903

Abstract

Production of gold nanoparticles with the specific goal of particle size control has been investigated by systematic variation of chamber pressure and substrate temperature. Gold nanoparticles have been synthesized on SiO2 nanowires by plasma-enhanced chemical vapor deposition. Determination of particle size and particle size distribution was done using transmission electron microscopy. Average nanoparticle diameters were between 4 and 12 nm, with particle size increasing as substrate temperature increased from 573 to 873 K. A bimodal size distribution was observed at temperatures ≥723 K indicating Ostwald ripening dominated by surface diffusion. The activation energy for surface diffusion of gold on SiO2 was determined to be 10.4 kJ/mol. Particle sizes were found to go through a maximum with increases in chamber pressure. Competition between diffusion within the vapor and dissociation of the precursor caused the pressure effect.

(Received March 28 2005)

(Accepted August 02 2005)

Key Words:

  • Metal;
  • Nanoparticle;
  • Plasma-enhanced CVD (PECVD)

Correspondence:

c1 Address all correspondence to this author. e-mail: norton@mme.wsu.edu

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