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

• 来源期刊: 中国物理B（英文版）
• 关键词: ZnO multilayer composite structure surface-enhanced Raman scattering (SERS) dielectric layer electromagnetic field enhancement
• 年，卷（期）: 2019,（12）
• 页码范围: 189-194
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab4d45

摘要

We describe the synthesis of three-dimensional (3D) multilayer ZnO@Ag/SiO2@Ag nanorod arrays by the physicochemical 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.