Research Paper

Journal of Nanoparticle Research

, Volume 11, Issue 8, pp 2137-2143

Ripening of nanowire-supported gold nanoparticles

  • Timothy TurbaAffiliated withSchool of Mechanical and Materials Engineering, Washington State University Email author 
  • , M. Grant NortonAffiliated withSchool of Mechanical and Materials Engineering, Washington State University
  • , Ishwar NiraulaAffiliated withDepartment of Physics, University of Idaho
  • , David N. McIlroyAffiliated withDepartment of Physics, University of Idaho

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Abstract

Gold nanoparticles have applications ranging from catalysts for low temperature oxidation of CO to solar energy capture in the infrared. For all these applications, particle size and shape are critical. In this study, nanoparticle gold formed on GaN nanowires by plasma-enhanced chemical vapor deposition was annealed at temperatures ranging from 150 to 270 °C for 24 h. Particle size was measured before and after annealing using a field emission scanning electron microscope. Ripening of the gold particles was observed even at the lowest annealing temperatures of the study. The particle growth kinetics showed an Arrhenius relationship with activation energy of 27.38 kJ/mol. This value suggests that ripening occurs by particle migration and coalescence rather than adatom diffusion.

Keywords

Gold nanoparticles Ripening GaN nanowires Particle migration and coalescence Nanomaterials Nanocomposites