Highly reproducible SERS substrate based on polarization-free Ag nanoparticles decorated SiO2/Si core-shell nanowires array
Xiao-Ying Liu,
Jian-An Huang,
Bo Yang,
Xue-Jin Zhang,
Yong-Yuan Zhu
Affiliations
Xiao-Ying Liu
Key Laboratory of Modern Acoustics and National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
Jian-An Huang
Key Laboratory of Modern Acoustics and National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
Bo Yang
Key Laboratory of Modern Acoustics and National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
Xue-Jin Zhang
Key Laboratory of Modern Acoustics and National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
Yong-Yuan Zhu
Key Laboratory of Modern Acoustics and National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
SiO2/Si core-shell nanowires array coated with gap-rich silver nanoparticles were demonstrated as a highly reproducible surface-enhanced Raman scattering (SERS) substrate. SERS detection of a relative standard deviation of 8% for 10−4 M R6G with a spot size of ∼2 μm and 900 spots over an area of 150 × 150 μm2 was reported. The high reproducibility is ascribed to the polarization-independent electrical field distribution among three-dimensional nanowire structure with an optimized thickness of SiO2 shell layer.
