Research on Raman Enhancement of Silicon Dioxide Substrate Modified by Different Thickness of Au Nanoparticles Based on Sensors

摘要

In this paper, a series of orthogonal experiments on the silicon dioxide (SiO_2) substrate of the fiber optic sensor are carried out. The surface modification of the substrate with different thicknesses of Au nanoparticles is carried out, and the surface-enhanced Raman spectra of the optic-based materials are studied. The Raman spectra of various cases are analyzed, and the samples are compared under different conditions. At the same time, the surface morphology and composition of the samples are observed. The mechanism of sample formation is analyzed, including the influence of various experimental conditions on the samples. The optimized conditions were selected to make the Raman enhancement factor of SiO_2 substrate reach 105 or higher, which provides a theoretical basis for the combination of surface-enhanced Raman spectroscopy and optical fiber sensing technology. It also provides guidance for materials, structures and processes in chemical quantity, especially for biomass detection by optical fiber sensing technology. Besides, the application provides an important reference value for the field of biochemistry.