期刊
SMALL
卷 5, 期 6, 页码 750-757出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200801920
关键词
atomic layer deposition; nanoparticles; platinum; strontium titanate; X-ray analysis
类别
资金
- US Department of Energy [DE-FG02-03ER15457, DE-AC02-06CH11357]
- National Science Foundation [DMR-0520513]
With an eye toward using surface morphology to enhance heterogeneous catalysis, Pt nanoparticles are grown by atomic layer deposition (ALD) on the surfaces of SrTiO3 nanocubes. The size, dispersion, and chemical state of the Pt nanoparticles are controlled by the number of ALD growth cycles. The SrTiO3 nanocubes average 60 nm on a side with {001} faces. The Pt loading increases linearly with Pt ALD cycles to a value of 1.1 X 10(-6) g cm(-2) after five cycles. Scanning electron microscopy images reveal discrete, well-dispersed Pt nanoparticles. Small- and wide-angle X-ray scattering show that the Pt nanoparticle spacing and size increase as the number of ALD cycles increases. X-ray absorption spectroscopy shows a progression from platinum(II) oxide to metallic platinum and a decrease in Pt-O bonding with an increase in Pt-Pt bonding as the number of ALD cycles increases.
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