Ripening of nanowire-supported gold nanoparticles
- 205 Downloads
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.
KeywordsGold nanoparticles Ripening GaN nanowires Particle migration and coalescence Nanomaterials Nanocomposites
- Bore MT, Pham HN, Ward TL and Datye AK (2004) Role of pore curvature on the thermal stability of gold nanoparticles in mesoporous silica. Chem Commun (Camb) 2620–2621. doi:10.1039/b407575g
- Dobrokhotov V, McIlroy DN, Norton MG, Abuzir A, Yeh WJ, Stevenson I, Pouy R, Bochenek J, Cartwright M, Wang L, Dawson J, Beaux M, Berven CA (2006a) Principles and mechanisms of gas sensing by GaN nanowires functionalized with gold nanoparticles. J Appl Phys 99:104302–104307. doi:10.1063/1.2195420 CrossRefADSGoogle Scholar
- Landolt-Boernstein (1990) Numerical data and functional relationships in science and technology, diffusion in solid metals and alloys, vol 26. Springer, Berlin, p 640Google Scholar