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Front. Chem. | doi: 10.3389/fchem.2019.00647

Plasmon enhanced fluorescence and Raman scattering by [Au-Ag alloy NP cluster]@SiO2 core-shell nanostructure

Chengyun Zhang1, Tingting Zhang1,  Zhenglong Zhang1* and Hairong Zheng1
  • 1Shaanxi Normal University, China

Silica-shell coated noble metal nanoparticles have shown a good performance in surface enhanced fluorescence and Raman scattering. However, silica-shell coated single noble nanoparticle cannot effectively enhance the optical signal due to the relative weak near-field enhancement. In this paper, [Au-Ag alloy NP cluster]@SiO2 core-shell nanostructure is employed to achieve the effective electric field enhancement. With the specific structure, simultaneous Raman scattering and fluorescence emission enhancement is obtained, and the enhancement comparison of fluorescence emission with Raman scattering in different type agglomeration of metal NPs is investigated in-situ. With different thickness of SiO2 shell, the optimized Raman and fluorescence enhancement systems are obtained respectively, and corresponding study of power dependence are investigated in detail. The selectively enhanced Raman and fluorescence can be realized via controlling the shell thickness and laser power. Our work provides a non-polarization dependent [metal NP cluster]@SiO2 system, which may have a promising application in portable chemical and biochemistry detecting.

Keywords: Plasmon enhanced spectroscopy, Raman Scattering, fluorescence, Core-shell structure, Au-Ag alloy NP cluster

Received: 19 Apr 2019; Accepted: 10 Sep 2019.

Copyright: © 2019 Zhang, Zhang, Zhang and Zheng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Zhenglong Zhang, Shaanxi Normal University, Xi'an, 710062, Shaanxi Province, China,