Accelerated growth from amorphous clusters to metallic nanoparticles observed in electrochemical deposition of platinum within nanopores of porous silicon
Accelerated growth from amorphous clusters to metallic nanoparticles observed in electrochemical deposition of platinum within nanopores of porous silicon
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DOI：
10.1016/j.elecom.2016.07.013
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发表时间：
2016-10
影响因子：
5.4
通讯作者：
A. Muñoz-Noval;Kazuhiro Fukami;A. Koyama;D. Gallach;D. Hermida-Merino;G. Portale;A. Kitada;K. Murase;T. Abe;S. Hayakawa;T. Sakka
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文献类型：
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作者：
A. Muñoz-Noval;Kazuhiro Fukami;A. Koyama;D. Gallach;D. Hermida-Merino;G. Portale;A. Kitada;K. Murase;T. Abe;S. Hayakawa;T. Sakka
研究了多孔硅纳米孔填充初期非晶铂团簇的形成。利用X射线吸收精细结构谱（XAFS）研究了Pt在纳米多孔硅中的化学状态和局域结构随时间的变化。最初，Pt沉积物显示出不可忽略的量的PtO2，其由来自大气的表面氧化形成，这表明颗粒尺寸相当小。扩展XAFS（EXAFS）的深入分析强烈表明，在沉积的早期阶段，铂是非晶态的。基于Pt络合阴离子在纳米孔中的限制效应，讨论了非晶态Pt的形成机理。
This study examined the formation of amorphous platinum (Pt) clusters in nanopores of porous silicon at an initial stage of pore filling. The time dependency of the chemical state and local structure of Pt in the nanoporous silicon were characterized by X-ray absorption fine structure spectroscopy (XAFS). Initially, the Pt deposits showed non-negligible amounts of PtO2, formed by surface oxidation from the atmosphere, suggesting that the particle size was quite small. Deep analysis of extended XAFS (EXAFS) strongly suggested that Pt at the early stage of deposition was amorphous. The mechanism of amorphous Pt formation is discussed based on the confinement effect for Pt complex anions in nanopores.