Well-Controlled Synthesis of Au@Pt Nanostructures by Gold-Nanorod-Seeded Growth

被引：101

作者：

Feng, Lili ^{[1
,3
]}

Wu, Xiaochun ^{[1
]}

Ren, Lirong ^{[1
]}

Xiang, Yanjuan ^{[2
]}

He, Weiwei ^{[1
,3
]}

Zhang, Ke ^{[1
]}

Zhou, Weiya ^{[2
]}

Xie, Sishen ^{[2
]}

机构：

[1] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China

[2] Inst Phys, Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

[3] Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2008年 / 14卷 / 31期

基金：

中国国家自然科学基金;

关键词：

crystal growth; gold; nanostructures; platinum; surface plasmon resonance;

D O I：

10.1002/chem.200800544

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pt nanodots were formed oil Au nanorods (NRs) by using a simple seed-mediated growth. Their density and distribution on the Au NR can he finely tuned by varying the reaction parameters. At lower Pt/Au ratios, the Pt nanodots mainly appear at endcaps and side edges of the Au rod. At higher Pt/Au ratios, they distribute homogeneously over the whole Au rod. The obtained Pt nanostructure is a single crystal owing to the epitaxial growth of Pt on the Au rod. Due to the unique surface plasmon resonance (SPR) features of the AU NRs. the Au core/Pt shell (AU@Pt) nanostructures also exhibit well-defined and red-shifted longitudinal SPR hands in the visible and near-infrared region. The position and intensity can be regulated by the thickness and amount of the Pt shell. At a thinner Pt thickness, the Au@'Pt NRs show higher dielectric sensitivity than the corresponding Au NRs. It thus opens up the potential of Pt nanostructures for SPR-based sensing.

引用

页码：9764 / 9771

页数：8

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