Selectively Deposited Silver Coatings on Gold-Capped Silicon Nanowires for Surface-Enhanced Raman Spectroscopy

被引：12
作者：
Becker, M. [1 ,2 ]
Stelzner, Th. [1 ]
Steinbrueck, A. [1 ]
Berger, A. [1 ,2 ]
Liu, J. [2 ]
Lerose, D. [2 ]
Goesele, U. [2 ]
Christiansen, S. [1 ,2 ]
机构：
[1] Inst Photon Technol, D-07745 Jena, Germany
[2] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany
来源：
CHEMPHYSCHEM | 2009年 / 10卷 / 08期
关键词：
dyes/pigments; gold; nanostructures; Raman spectroscopy; silver; SINGLE MOLECULES; NANOPARTICLES; AG; PYRIDINE; SPECTRA; LIGHT; SERS; DNA; AU;
D O I：
10.1002/cphc.200800809
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：
Gold caps on silicon nanowires are hemispherical and only a few tens of nanometers in diameter when grown from metal catalysts by the vapor-liquid-solid growth mechanism using chemical vapor deposition. These gold caps are capable of enhancing Raman signals based on the surface-enhanced Raman scattering effect. The Raman signal can be enhanced even further (by at least one order of magnitude) when silver is selectively deposited onto these gold caps by autometallography (electroless deposition). By changing the silver deposition conditions, different coating morphologies can be realized on the gold caps that range from very thin, smooth layers to uneven and extremely rough coatings. The SERS signal enhancement and the spatial homogeneity of the achievable enhancement are compared for the different silver coatings using a model dye molecule.
引用
收藏
页码：1219 / 1224
页数：6
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