Surface morphological modification of Pt thin films induced by growth temperature

Formation of self-organized platinum nanoparticles and their microphotoluminescence enhancement in the visible light region

“…Annealing at the high temperature allows mass transport of small clusters across the surface to form larger clusters in a process analogous to the Ostwald ripening mechanism. 16,17 Island formation mechanism analogous to Ostwald ripening could also be observed in our experiments. Figures 3͑a͒ and 3͑b͒ show feature variation in the surface morphology with the annealing temperature for those samples shown in Figs.…”

Burrowing of Pt nanoparticles into SiO2 during ion-beam irradiation

“…Pt nanoparticles were selected for these experiments since noble metal nanoparticles on amorphous substrates such as SiO 2 , Al 2 O 3 , and glassy carbon have been widely used for heterogeneous catalysis. [15][16][17][18][19][20] Pt, moreover, is relatively inert in air, making possible ex situ characterization of irradiated samples. For the irradiation experiments of Pt nanoparticles on alumina, an additional 1000 Å layer of Al 2 O 3 was deposited onto the thermally oxidized Si wafers by rf sputtering at a rate of 0.1 Å s Ϫ1 prior to the Pt deposition.…”

Self-Organized Surface Nanopatterning by Ion Beam Sputtering

“…However, a different scenario has to be considered for IBS nanostructuring of thin metallic films. These systems are usually polycrystalline and mainly formed by grains that are randomly oriented, and with sizes that are usually much smaller than the film thickness [85,180]. For such systems, the existence of ES barriers becomes improbable due to the lack of well-defined atomic steps at the surface [85].…”