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
Department of Materials Science and Engineering Northwestern University Evanston, IL 60208-3108, USA.
Small. 2009 Mar;5(6):750-7. doi: 10.1002/smll.200801920.
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.
着眼于利用表面形态来增强多相催化，通过原子层沉积（ALD）在SrTiO₃纳米立方体表面生长铂纳米颗粒。铂纳米颗粒的尺寸、分散性和化学状态由ALD生长循环的次数控制。SrTiO₃纳米立方体的边长平均为60纳米，具有{001}面。铂负载量随铂ALD循环次数线性增加，五个循环后达到1.1×10⁻⁶ g cm⁻²的值。扫描电子显微镜图像显示出离散的、分散良好的铂纳米颗粒。小角和广角X射线散射表明，随着ALD循环次数的增加，铂纳米颗粒的间距和尺寸增大。X射线吸收光谱显示，随着ALD循环次数的增加，从氧化铂（II）向金属铂转变，Pt - O键减少，Pt - Pt键增加。
