Irreversible accumulated SERS behavior of the molecule-linked silver and silver-doped titanium dioxide hybrid system

Lu Zhou, Jun Zhou (), Wei Lai, Xudong Yang, Jie Meng, Liangbi Su, Chenjie Gu, Tao Jiang, Edwin Yue Bun Pun, Liyang Shao, Lucia Petti, Xiao Wei Sun, Zhenghong Jia, Qunxiang Li, Jiaguang Han and Pasquale Mormile
Additional contact information
Lu Zhou: Ningbo University
Jun Zhou: Ningbo University
Wei Lai: Ningbo University
Xudong Yang: Ningbo University
Jie Meng: University of Science and Technology of China
Liangbi Su: Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences
Chenjie Gu: Ningbo University
Tao Jiang: Ningbo University
Edwin Yue Bun Pun: City University of Hong Kong
Liyang Shao: Southern University of Science and Technology
Lucia Petti: Institute of Applied Sciences and Intelligent Systems-ISASI, CNR, Via Campi Flegrei
Xiao Wei Sun: Southern University of Science and Technology
Zhenghong Jia: Xinjiang University
Qunxiang Li: University of Science and Technology of China
Jiaguang Han: Tianjin University
Pasquale Mormile: Institute of Applied Sciences and Intelligent Systems-ISASI, CNR, Via Campi Flegrei

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract In recent years, surface-enhanced Raman scattering (SERS) of a molecule/metal–semiconductor hybrid system has attracted considerable interest and regarded as the synergetic contribution of the electromagnetic and chemical enhancements from the incorporation of noble metal into semiconductor nanomaterials. However, the underlying mechanism is still to be revealed in detail. Herein, we report an irreversible accumulated SERS behavior induced by near-infrared (NIR) light irradiating on a 4-mercaptobenzoic acid linked with silver and silver-doped titanium dioxide (4MBA/Ag/Ag-doped TiO2) hybrid system. With increasing irradiation time, the SERS intensity of 4MBA shows an irreversible exponential increase, and the Raman signal of the Ag/Ag-doped TiO2 substrate displays an exponential decrease. A microscopic understanding of the time-dependent SERS behavior is derived based on the microanalysis of the Ag/Ag-doped TiO2 nanostructure and the molecular dynamics, which is attributed to three factors: (1) higher crystallinity of Ag/Ag-doped TiO2 substrate; (2) photo-induced charge transfer; (3) charge-induced molecular reorientation.

Date: 2020
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DOI: 10.1038/s41467-020-15484-6

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