Nano Archive

Ripening of nanowire-supported gold nanoparticles

Turba, Timothy and Norton, M. Grant and Niraula, Ishwar and McIlroy, David N. (2009) Ripening of nanowire-supported gold nanoparticles. Journal of Nanoparticle Research, 11 (8). pp. 2137-2143.

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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.

Item Type:Article
Uncontrolled Keywords:Gold nanoparticles - Ripening - GaN nanowires - Particle migration and coalescence - Nanomaterials - Nanocomposites
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanostructured materials
ID Code:7955
Deposited By:IoN
Deposited On:07 Jan 2010 15:46
Last Modified:07 Jan 2010 15:46

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