Nanosurface-confined nucleation and patterned growth of Pt and TiO2.
The nanosurface-confined nucleation and growth processes of Pt and TiO2 were investigated when Pt was sputter deposited and TiO2 was sol-gel coated on a unique surface-designed substrate. The substrate was an anodic aluminum oxide (AAO) film with self-assembled grouped nanopores (SGNPs). The SGNPs gave rise to unique nucleation sites comprising very small-sized boundaries and nanopores. Pt sputter deposition onto the SGNPs showed restricted growth of nanogranules. The TiO2 sol-gel coating onto the SGNPs resulted in unique formations of nanopore and network structures. The unique nucleation phenomena of Pt and TiO2 on the nanometer-sized surfaces are explained by a combination of two effects: confinement of the degree of freedom at the nucleation sites and growth direction. This is different from conventional surface nucleation that yields the growth of islands, layer-by-layer deposition, and epitaxy.
Huh
Seung H
SH
Nanomaterial Application Division, Korea Institute of Ceramic Engineering and Technology, 233-5 Gasan-Dong, Guemcheon-Gu, Seoul 153-801, Korea.
Jin
Eun J
EJ
Riu
Doh H
DH
Choi
Jinsub
J
Cho
Kwang Y
KY
D000537:Aluminum Oxide / Q000737:chemistry; D003460:Crystallization; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D036103:Nanotechnology / Q000379:methods*; D044367:Phase Transition; D010777:Photochemistry / Q000379:methods*; D010984:Platinum / Q000737:chemistry*; D012825:Silicon; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
C009495:titanium dioxide; D010984:Platinum; D014025:Titanium; D000537:Aluminum Oxide; D012825:Silicon