Efficient Raman enhancement and intermittent light emission observed in single gold nanocrystals

被引：362

作者：

Krug, JT ^{[1
]}

Wang, GD ^{[1
]}

Emory, SR ^{[1
]}

Nie, SM ^{[1
]}

机构：

[1] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1999年 / 121卷 / 39期

关键词：

D O I：

10.1021/ja992058n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This paper reports two fundamental observations on the size-dependent optical properties of colloidal gold nanoparticles. First, faceted gold nanocrystals in the size range of 63 +/- 3 nm have been found to be highly efficient for surface-enhanced Raman scattering (SERS). These nanocrystals are identified from a heterogeneous population for large optical enhancement at 647-nm laser excitation. Second, spatially isolated single gold particles emit Stokes-shifted Raman photons in an intermittent on-and-off fashion. In contrast to population-averaged studies, blinking surface-enhanced Raman scattering is a signature of single-particle (or even single-molecule) behavior. By directly measuring optical enhancement and time-resolved emission on single nanoparticles, this work opens new possibilities in studying the mechanisms of SERS, in developing metal tips for near-field optical microscopy, and in designing new nanostructured materials.

引用

页码：9208 / 9214

页数：7

共 53 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].