Measurement of the distribution of site enhancements in surface-enhanced Raman scattering

被引：1138

作者：

Fang, Ying ^{[1
]}

Seong, Nak-Hyun ^{[1
]}

Dlott, Dana D. ^{[1
]}

机构：

[1] Univ Illinois, Sch Chem Sci, Urbana, IL 61801 USA

来源：

SCIENCE | 2008年 / 321卷 / 5887期

关键词：

D O I：

10.1126/science.1159499

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 [理学]; 0710 [生物学]; 09 [农学];

摘要：

On nanotextured noble-metal surfaces, surface-enhanced Raman scattering (SERS) is observed, where Raman scattering is enhanced by a factor, G, that is frequently about one million, but underlying the factor (G) over bar is a broad distribution of local enhancement factors, eta. We have measured this distribution for benzenethiolate molecules on a 330-nanometer silver-coated nanosphere lattice using incident light of wavelength 532 nanometers. A series of laser pulses with increasing electric fields burned away molecules at sites with progressively decreasing electromagnetic enhancement factors. The enhancement distribution P(eta)d eta was found to be a power law proportional to ((eta))(-1.75), with minimum and maximum values of 2.8 x 10(4) and 4.1 x 10(10), respectively. The hottest sites (eta > 10(9)) account for just 63 in 1,000,000 of the total but contribute 24% to the overall SERS intensity.

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页码：388 / 392

页数：5

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