Measurement of the distribution of site enhancements in surface-enhanced Raman scattering
Measurement of the distribution of site enhancements in surface-enhanced Raman scattering
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DOI：
10.1126/science.1159499
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发表时间：
2008-07-18
期刊：
影响因子：
56.9
通讯作者：
Dlott, Dana D.
中科院分区：
文献类型：
--
作者：
Fang, Ying;Seong, Nak-Hyun;Dlott, Dana D.
在纳米织构的贵金属表面上，观察到表面增强的拉曼散射（Sers），其中拉曼散射被增强因子G，其通常约为一百万，但是在因子（G）之上的是局部增强因子η的广泛分布。我们已经测量了这种分布的苯硫酚分子在330纳米的银涂层的纳米球晶格使用波长为532纳米的入射光。一系列具有增加的电场的激光脉冲在具有逐渐减小的电磁增强因子的位点处烧除分子。发现增强分布P（eta）d eta是与（（eta））（-1.75）成比例的幂律，最小值和最大值分别为2.8 x 10（4）和4.1 x 10（10）。最热的位点（eta > 10（9））仅占总数的63/1，000，000，但对整体Sers强度的贡献为24%。
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.