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Controlled Growth of Platinum Nanoparticles on Strontium Titanate Nanocubes by Atomic Layer Deposition
Author(s) -
Christensen Steven T.,
Elam Jeffrey W.,
Rabuffetti Federico A.,
Ma Qing,
Weigand Steven J.,
Lee Byeongdu,
Seifert Soenke,
Stair Peter C.,
Poeppelmeier Kenneth R.,
Hersam Mark C.,
Bedzyk Michael J.
Publication year - 2009
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200801920
Subject(s) - atomic layer deposition , platinum , platinum nanoparticles , materials science , nanoparticle , strontium titanate , chemical engineering , scanning electron microscope , catalysis , deposition (geology) , layer (electronics) , nanotechnology , analytical chemistry (journal) , thin film , chemistry , composite material , paleontology , engineering , biochemistry , chromatography , sediment , biology
With an eye toward using surface morphology to enhance heterogeneous catalysis, Pt nanoparticles are grown by atomic layer deposition (ALD) on the surfaces of SrTiO 3 nanocubes. The size, dispersion, and chemical state of the Pt nanoparticles are controlled by the number of ALD growth cycles. The SrTiO 3 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 × 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 PtO bonding with an increase in PtPt bonding as the number of ALD cycles increases.