Systematic control of the size, density and configuration of Pt nanostructures on sapphire (0 0 0 1) by the variation of deposition amount and dwelling time

Self‐Organization Based Fabrication of Bimetallic PtPd Nanoparticles on Transparent Conductive Oxide Substrates

“…For example, Kunwar, Pandey et al obtained monometallic Pd and Pt NPs on a flat sapphire substrate by solid‐state dewetting of deposited Pd or Pt thin films by means of thermal process in oven, maintaining the temperature below the melting temperature of Pt and Pd . This process leads to the formation of NPs from the deposited film through surface diffusion, nucleation, Volmer‐Weber growth and surface energy minimization mechanism . So, Kunwar et al obtained NPs with size that increases when the thickness of the deposited films increases from 1 to 40 nm.…”

“…The production of metallic nanoparticles on surfaces has received great attention due to the enormous surface‐volume ratio compared to the correspondent bulk materials, and which make them useful for many applications in several fields as in plasmonics, energy production and storage, photonics . Among the various species of metallic nanoparticles (NPs), Pt and Pd NPs find important devices applications for sensing detection, catalysis, direct alcohol fuel cells, hydrogen storage, etc .…”

Fabrication of Ag nanostructures by the systematic control of annealing temperature and duration on GaN (0001) via the solid state dewetting

“…In the Ostwald's ripening, the evolution of NPs can be influenced by the relation, µ r = µ ∞ + (2 γΩ )/ r , where the µ r and µ ∞ are the chemical potential of NPs with the radius r and infinitely large NPs, i.e., flat surface. The γ is the isotropic surface energy and Ω is the atomic volume . From the above equation, the chemical potential of smaller NP is higher and, therefore, the adatoms from the smaller NPs can desorb and diffuse toward the bigger ones that possess the lower chemical potential.…”

Improved control on the morphology and LSPR properties of plasmonic Pt NPs through enhanced solid state dewetting by using a sacrificial indium layer

“…30 In comparison with the conventional dewetting of pure Pt on sapphire, the In component accelerates the overall dewetting process and hence the well-structured and isolated Pt NPs can be developed. 31,32 In the case of pure Pt, only minor surface roughness development with the formation of hillocks and pinholes was observed below 600 C and the Pt NPs were compact and irregular even at 900 C because of the low surface diffusivity of Pt atoms as discussed. 31,32 Apparently, in this work, the void nucleation, growth and NP formation was obtained at relatively lower temperature and the Pt NPs were regular and well-separated as compared with the pure Pt dewetting, which can be correlated to the dewetting enhancement by the sacricial In component as mentioned.…”