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Controlled Growth of Gold Nanoparticles on Silica Nanowires

Published online by Cambridge University Press:  03 March 2011

Aaron D. LaLonde ,
M. Grant Norton ,
Daqing Zhang ,
Devananda Gangadean ,
Abdullah Alkhateeb ,
Radhakrishnan Padmanabhan  and
David N. McIlroy
Aaron D. LaLonde
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920
M. Grant Norton
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920
Daqing Zhang
Affiliation:
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
Devananda Gangadean
Affiliation:
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
Abdullah Alkhateeb
Affiliation:
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
Radhakrishnan Padmanabhan
Affiliation:
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
David N. McIlroy
Affiliation:
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
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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.

Keywords

MetalNanoparticlePlasma-enhanced CVD (PECVD)

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 3021 - 3027
Copyright
Copyright © Materials Research Society 2005

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