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Photocatalytic activity of silver/silica core–shell nanoparticles for reversible azo-dimerization

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Abstract

Surface-enhanced Raman scattering (SERS) is a promising technique for the study of plasma-driven photocatalytic reactions. It can not only detect the chemical information of probe molecules but also provide a suitable catalytic substrate for surface catalytic reactions. In this paper, SiO2-coated silver nanoparticles (Ag@SiO2) were designed and synthesized, as the photocatalyst for the surface plasmon-enhanced chemical reactions. Driven by the localized surface plasmon resonance (LSPR) over the surface of Ag@SiO2, 4,4′-dimercaptoazobenzene (DMAB) was successfully synthesized by the photocatalytic dimerization of 4-aminothiophenol (PATP) under the excitation of 532 nm laser. The reaction was found reversible under the same experimental conditions. In addition, we designed and synthesized a novel SERS substrate based on Ag@SiO2. Meanwhile, the SERS substrate based on Ag nanofilms (AgNF) also was prepared for comparison. With the same condition excitation laser, Raman signal enhancement effects are different when applying AgNF and Ag@SiO2, which could be attributed to the fact that the inert SiO2 shell eliminates the CE mechanism of the Raman signal. These results provide a simple strategy to figure out the mechanism of the catalytic reaction based on SERS.

Graphical abstract

Driven by the LSPR over the surface of Ag@SiO2, DMAB was successfully synthesized by the PATP under the excitation of a 532 nm laser. The reaction was found reversible under the same experimental conditions.

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (Grant Nos. 11774244, 11804237).

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Authors and Affiliations

  1. The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing, 100080, China

    Lisheng Zhang

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  1. Lisheng Zhang
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Correspondence to Lisheng Zhang.

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Zhang, L. Photocatalytic activity of silver/silica core–shell nanoparticles for reversible azo-dimerization. Eur. Phys. J. Plus 136, 1173 (2021). https://doi.org/10.1140/epjp/s13360-021-02167-4

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  • DOI: https://doi.org/10.1140/epjp/s13360-021-02167-4

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