Photoinduced Electron Transfer Process Visualized on Single Silver Nanoparticles.
Photoinduced Electron Transfer Process Visualized on Single Silver Nanoparticles.
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DOI：
10.1021/acsnano.6b08282
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发表时间：
2017-01
期刊：
影响因子：
17.1
通讯作者：
Gang Lei;P. Gao;Tong Yang;Jun Zhou;Hong Zhi Zhang;Shanshan Sun;M. Gao;C. Huang
中科院分区：
文献类型：
--
作者：
Gang Lei;P. Gao;Tong Yang;Jun Zhou;Hong Zhi Zhang;Shanshan Sun;M. Gao;C. Huang
了解光致电子转移（PET）机制对于提高太阳能材料和光敏系统的光电转换效率至关重要。在此，我们通过局域表面等离子体共振（LSPR）光谱耦合暗场显微镜实时监测单个银纳米颗粒（AgNP）上对氨基苯硫酚（p-ATP）（一种重要的SERS信号分子）光诱导化学转化为4,4'-二巯基偶氮苯，直观地展示了PET过程。由p-ATP的电子传递延迟引起的双向局域表面等离子体共振散射光谱先向红移，然后向低色移动，揭示了反应过程中从p-ATP通过AgNPs到O2的PET路径，并使我们能够数字化不同时间段AgNP表面相应的电子损失和增益。这种可视化 PET 过程可以提供一种简单而有效的方法来探索 PET 的性质，并有助于解释 p-ATP 方面的 SERS 机制。
Understanding the photoinduced electron transfer (PET) mechanism is vital to improving the photoelectric conversion efficiency for solar energy materials and photosensitization systems. Herein, we visually demonstrate the PET process by real-time monitoring the photoinduced chemical transformation of p-aminothiophenol (p-ATP), an important SERS signal molecule, to 4,4'-dimercaptoazobenzene on single silver nanoparticles (AgNPs) with a localized surface plasmon resonance (LSPR) spectroscopy coupled dark-field microscopy. The bidirectional LSPR scattering spectral shifts bathochromically at first and hypsochromically then, which are caused by the electron transfer delay of p-ATP, disclose the PET path from p-ATP to O2 through AgNPs during the reaction, and enable us to digitalize the corresponding electron loss and gain on the surface of AgNP at different time periods. This visualized PET process could provide a simple and efficient approach to explore the nature of PET and help to interpret the SERS mechanism in terms of p-ATP.