Journal article
Controlled Growth of Gold Nanoparticles on Silica Nanowires
Journal of materials research, Vol.20(11), pp.3021-3027
11/2005
Handle:
https://hdl.handle.net/2376/109249
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.
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Details
- Title
- Controlled Growth of Gold Nanoparticles on Silica Nanowires
- Creators
- Aaron D LaLonde - School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920M. Grant Norton - School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920Daqing Zhang - Department of Physics, University of Idaho, Moscow, Idaho 83844-0903Devananda Gangadean - Department of Physics, University of Idaho, Moscow, Idaho 83844-0903Abdullah Alkhateeb - Department of Physics, University of Idaho, Moscow, Idaho 83844-0903Radhakrishnan Padmanabhan - Department of Physics, University of Idaho, Moscow, Idaho 83844-0903David N McIlroy - Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
- Publication Details
- Journal of materials research, Vol.20(11), pp.3021-3027
- Academic Unit
- Mechanical and Materials Engineering, School of
- Publisher
- Cambridge University Press; New York, USA
- Number of pages
- 7
- Identifiers
- 99900547799201842
- Language
- English
- Resource Type
- Journal article