The formation of supported monodisperse Au nanoparticles by UV/ozone oxidation process

Randomly oriented ZnO nanowires grown on amorphous SiO2 by metal-catalyzed vapour deposition

“…In either of the above described mechanisms, it is clear that the substrate temperature will play a very important role by increasing the diffusion of adsorbed species, the Zn oxidation rates involved in the formation of ZnO, and the average size of the Au clusters [9]. All of these should contribute to an increase of the NW sizes with increasing T S , as indeed observed in the present study.…”

“…The results on different substrates demonstrate that the substrate material and structure play a very important role in the determination of the reaction kinetics that lead to the formation of the ZnO nanostructures. On Si (1 0 0), the size distribution of formations is wider than for the SiO 2 substrate, which could be due to a corresponding wider size distribution of Au nanoclusters expected from the larger surface energy of the crystalline material than that of the oxide [9]. In addition, ZnO crystallite nucleation and relatively ordered growth seem to be promoted on Si (1 0 0) by epitaxy related to crystalline Si directions.…”

“…Substrates were amorphous SiO2 layers (0.5 m-thick, grown on Si by thermal oxidation) where a thin (5 nm) Au layer had been deposited and annealed at 500 • C for 15 min to produce nanometer-sized Au clusters on it [9]. The Au nanoclusters are known to act as metal catalysts for one-dimensional growth for various systems [1].…”

Electrical, photoelectrical and morphological properties of ZnO nanofiber networks grown on SiO2 and on Si nanowires

“…In all cases, NF growth was promoted by Au nano-clusters deposited on the substrates 11 . These metallic nanoislands act as catalysts for one-dimensional growth (nanowires, nanocolumns) for different systems 4,[11][12][13] . Three ZnO NFN samples (S 0 , S 1 , S 2 ) were fabricated by the vapour-transport method.…”

A comparative study of the effect of gold seed particle preparation method on nanowire growth

“…From the perspective of controllability of particle surface density, i.e., the particle number concentration per area, and particle diameter, the TFA particles differ considerably from the other particle types. From the literature it is known that annealing temperature [14] and film thickness [5] can affect the particle distribution to some extent, with higher temperatures and thicker films yielding lower particle number concentrations and larger diameter particles. Regardless of film thickness, annealing time or annealing temperature, however, it is extremely difficult to achieve a low surface density and to independently control particle diameter and surface density.…”