Selective synthesis of three-dimensional ZnO@Ag/SiO2@Ag nanorod arrays as surface-enhanced Raman scattering substrates with tunable interior dielectric layer

doi:10.1088/1674-1056/ab4d45

Abstract We describe the synthesis of three-dimensional (3D) multilayer ZnO@Ag/SiO₂@Ag nanorod arrays by the physico-chemical method. The surface-enhanced Raman scattering (SERS) performance of the 3D multilayer ZnO@Ag/SiO₂@Ag nanorod arrays is studied by varying the thickness of dielectric layer SiO₂ and outer-layer noble Ag. The 3D ZnO@Ag/SiO₂@Ag nanorod arrays create a huge number of SERS “hot spots” that mainly contribute to the high SERS sensitivity. The great enhancement of SERS results from the electron transfer between ZnO and Ag and different electromagnetic enhancements of Ag nanoparticles (NPs) with different thicknesses. Through the finite-difference time-domain (FDTD) theoretical simulation, the enhancement of SERS signal can be ascribed to a strong electric field enhancement produced in the 3D framework. The simplicity and generality of our method offer great advantages for further understanding the SERS mechanism induced by the surface plasmon resonance (SPR) effect.

Keywords: ZnO multilayer composite structure surface-enhanced Raman scattering (SERS) dielectric layer electromagnetic field enhancement

Received: 06 June 2019
Revised: 24 August 2019
Accepted manuscript online:

PACS:	42.55.Ye	(Raman lasers)
	02.70.Bf	(Finite-difference methods)
	42.62.Fi	(Laser spectroscopy)

Fund: Project supported by the Fund from the Science and Technology Department of Jilin Province, China (Grant No. 20170520108JH), the Beihua University Youth Nurtural Fund, China (Grant No. 2017QNJJL15), the Beihua University PhD Research Start-up Fund, China (Grant No. 202116140), and the Undergraduate Innovation Project, China (Grant No. 220718100).

Corresponding Authors: Jia-Jia Mu
E-mail: allthat2010@126.com

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Jia-Jia Mu(牟佳佳), Chang-Yi He(何畅意), Wei-Jie Sun(孙伟杰), Yue Guan(管越) Selective synthesis of three-dimensional ZnO@Ag/SiO₂@Ag nanorod arrays as surface-enhanced Raman scattering substrates with tunable interior dielectric layer 2019 Chin. Phys. B 28 124204

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Selective synthesis of three-dimensional ZnO@Ag/SiO2@Ag nanorod arrays as surface-enhanced Raman scattering substrates with tunable interior dielectric layer

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Selective synthesis of three-dimensional ZnO@Ag/SiO₂@Ag nanorod arrays as surface-enhanced Raman scattering substrates with tunable interior dielectric layer