Single-Molecule Surface-Enhanced Raman Scattering Spectrum of Non-Resonant Aromatic Amine Showing Raman Forbidden Bands
Single-Molecule Surface-Enhanced Raman Scattering Spectrum of Non-Resonant Aromatic Amine Showing Raman Forbidden Bands
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发表时间：
2016-10
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通讯作者：
Yuko S Yamamoto;Yuya Kayano;Y. Ozaki;Zhenglong Zhang;T. Kozu;T. Itoh;S. Nakanishi
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作者：
Yuko S Yamamoto;Yuya Kayano;Y. Ozaki;Zhenglong Zhang;T. Kozu;T. Itoh;S. Nakanishi
本文报道了对氨基苯硫酚（PATP）的单分子表面增强拉曼散射（Sers）光谱。在4-ABT浓度为8 * 10^-10 M时测量，光谱显示出拉曼禁模。用非共振可见光激光获得的4-ABT的SM-SERS光谱不同于以前报道的4-ABT的Sers光谱，并且不能用量子力学计算重建。仔细的经典分配（不基于量子力学计算）的报告，并指出，在4-ABT的报告光谱的差异主要是由于拉曼禁带的外观。拉曼禁带的存在可以解释为4-ABT吸附在银纳米结构上的电荷转移（CT）效应，表明在Sers热点处的拉曼选择规则被打破。
We present the experimentally obtained single-molecule (SM) surface-enhanced Raman scattering (SERS) spectrum of 4-aminibenzenethiol (4-ABT), also known as para-aminothiophenol (PATP). Measured at a 4-ABT concentration of 8 * 10^-10 M, the spectra show Raman forbidden modes. The SM-SERS spectrum of 4-ABT obtained using a non-resonant visible laser is different from the previously reported SERS spectra of 4-ABT, and could not be reconstructed using quantum mechanical calculations. Careful classical assignments (not based on quantum-mechanical calculations) are reported, and indicate that differences in the reported spectra of 4-ABT are mainly due to the appearance of Raman forbidden bands. The presence of Raman forbidden bands can be explained by the charge-transfer (CT) effect of 4-ABT adsorbed on the silver nanostructures, indicating a breakdown of Raman selection rules at the SERS hotspot.