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Au-Pt alloy nanocrystals incorporated in silica films

被引：58
作者：
De, G
Rao, CNR
机构：
[1] Indian Inst Sci, Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
[2] Cent Glass & Ceram Res Inst, Sol Gel Div, Kolkata 700032, W Bengal, India
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2005年 / 15卷 / 08期
关键词：
D O I：
10.1039/b412429d
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
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收藏
页码：891 / 894
页数：4
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