標題: Controlled synthesis and growth of perfect platinum nanocubes using a pair of low-resistivity fastened silicon wafers and their electrocatalytic properties
作者: Tiwari, Jitendra N.
Tiwari, Rajanish N.
Lin, Kunlin
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Fastened silicon wafers;charge density;Pt nanocubes;catalytic activity;liquid feed fuel cells
公開日期: 1-六月-2011
摘要: Perfect platinum (Pt) nanocubes with high density have been synthesized by controlled reduction of hexachloroplatinic acid in the presence of H(2)SO(4) and HCl, employing a pair of low-resistivity fastened silicon (FS) wafers at room temperature. The presence of the additive charges (induced by prior etching of the silicon surface with HF to remove any SiO(2) layer) between the interfaces of the FS surface results in a high charge density and facilitates fast deposition of Pt nanoparticles via electroless plating. The charge density, stirring time, and homogeneity of the aqueous solution influenced the geometrical shapes of the Pt nanoparticles. The parameters were finely tuned in order to control the nucleation and growth rates and obtain perfect Pt nanocubes. The perfect Pt nanocubes were single crystalline with exposed {100} facets. Per equivalent Pt surface areas, the perfect Pt nanocubes showed enhanced catalytic activity relative to truncated Pt nanocubes or spherical Pt nanoparticles for the electrooxidation of liquid feed fuels such as methanol and ethanol. Moreover, there a strong correlation was observed between the optical, electrical, thermal, magnetic, and catalytic properties of the perfect Pt nanocubes which should lead to a variety of technological applications of these materials.
URI: http://dx.doi.org/10.1007/s12274-011-0110-4
http://hdl.handle.net/11536/23400
ISSN: 1998-0124
DOI: 10.1007/s12274-011-0110-4
期刊: NANO RESEARCH
Volume: 4
Issue: 6
起始頁: 541
結束頁: 549
顯示於類別:期刊論文


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  1. 000290804100003.pdf