Controlled growth of platinum nanoparticles on strontium titanate nanocubes by atomic layer deposition.
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 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.
Christensen
Steven T
ST
Department of Materials Science and Engineering Northwestern University Evanston, IL 60208-3108, USA.
Elam
Jeffrey W
JW
Rabuffetti
Federico A
FA
Ma
Qing
Q
Weigand
Steven J
SJ
Lee
Byeongdu
B
Seifert
Soenke
S
Stair
Peter C
PC
Poeppelmeier
Kenneth R
KR
Hersam
Mark C
MC
Bedzyk
Michael J
MJ
D003460:Crystallization / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D046911:Macromolecular Substances; D010087:Oxides; D010984:Platinum; D014025:Titanium; C119252:strontium titanium oxide; D013324:Strontium