Kim Jung Hoon, Woo Hee Jin, Kim Chang Kyung, Yoon Chong Seung
Division of Materials Science and Engineering, Hanyang University, Seoul, Korea.
Nanotechnology. 2009 Jun 10;20(23):235306. doi: 10.1088/0957-4484/20/23/235306. Epub 2009 May 18.
3.5 nm sized Pt nanocatalysts supported on silicon oxide nanowires (SiO(X)NWs) were fabricated by decorating the SiO(X)NWs with Pt nanoparticles using a simple physical deposition system without any surface pretreatment. High curvature of the nanowire surface together with the weak metal-substrate interaction helped to maintain discrete particle morphology with spherical shapes during deposition. Catalytic efficiency of the SiO(X)NWs coated with Pt nanoparticles was demonstrated through reduction of methylene blue in the presence of sodium borohydride. It was demonstrated that the highly curved nanowire surface allowed the Pt nanoparticles to be loaded with increased particle density, providing a larger surface area for the catalytic reaction. It was also shown that a simple heat treatment in vacuum improves the effectiveness of the Pt nanoparticles as a catalyst without loss of catalytic activity when used repeatedly. We expect that this metal nanoparticle-decorated nanowire can be easily extended to other heterogeneous reactions and can also be used as a template for building three-dimensional hierarchical nanostructures.
通过使用简单的物理沉积系统在没有任何表面预处理的情况下用铂纳米颗粒修饰氧化硅纳米线（SiO(X)NWs），制备了负载在氧化硅纳米线上的3.5纳米尺寸的铂纳米催化剂。纳米线表面的高曲率以及较弱的金属-衬底相互作用有助于在沉积过程中保持离散的球形颗粒形态。通过在硼氢化钠存在下还原亚甲基蓝，证明了涂覆有铂纳米颗粒的SiO(X)NWs的催化效率。结果表明，高度弯曲的纳米线表面允许以增加的颗粒密度负载铂纳米颗粒，为催化反应提供更大的表面积。还表明，在真空中进行简单的热处理可提高铂纳米颗粒作为催化剂的有效性，并且在重复使用时不会损失催化活性。我们期望这种金属纳米颗粒修饰的纳米线能够轻松扩展到其他多相反应，并且还可以用作构建三维分级纳米结构的模板。
