Au-Pt alloy nanocrystals incorporated in silica films
Au-Pt alloy nanocrystals incorporated in silica films
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DOI：
10.1039/b412429d
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发表时间：
2005-01-01
影响因子：
--
通讯作者：
Rao, CNR
中科院分区：
文献类型：
--
作者：
De, G;Rao, CNR
通过溶胶-凝胶旋涂法在 SiO2 薄膜基质中制备了 Au、Pt 和 Au-Pt 合金纳米晶体，然后在 10% H-2-90% Ar 中于 450℃ 下加热。 X 射线衍射图显示 Au 和 Au-Pt 纳米晶体具有优先 (111) 取向。当增加 Pt 浓度时，部分 Pt 不会与 Au 形成合金，而是在 Au-Pt 合金核周围形成壳。合金成分本身达到 Au(50) : Pt(50)，并且 Pt 壳形成在 Au(75) : Pt(25) 合金成分之上的合金周围。由于Au-Pt合金和核壳结构的形成，Au的544 nm处的表面等离子体共振（SPR）带逐渐消失。
Au, Pt and Au-Pt alloy nanocrystals have been prepared in thin SiO2 film matrices by sol-gel spin-coating, followed by heating at 450degreesC in 10% H-2-90% Ar. X-Ray diffraction patterns reveal that the Au and Au-Pt nanocrystals have a preferential (111) orientation. Upon increasing the Pt concentration, part of the Pt does not alloy with Au, but instead forms a shell around the Au-Pt alloy core. The alloy composition itself goes up to Au(50) : Pt(50), and the Pt shells are formed around the alloy above an alloy composition of Au(75) : Pt(25). The surface plasmon resonance (SPR) band at 544 nm of Au gradually disappears due to the formation of Au-Pt alloys and core - shell structures.