Modulation of SERS spectrum by controlling the spatial distribution of plastic nanoparticles
邱琛恆1*, 黃正良2, 蔡明善1
1Department of Electrophysics, National Chiayi University, Chiayi, Taiwan
2Department of Applied Chemistry, National Chiayi University, Chiayi, Taiwan
* presenting author:Ming-shan Tsai, email:mstsai@mail.ncyu.edu.tw
Surface enhanced Raman scattering (SERS) is modulated through controlling the nanospheres SiO2 concentration in gel solution. Ag nanoparticles of ~ 30 nm are coated on ITO glass to form the cell. The solution is prepared by controlling different concentration of plastic nanospheres SiO2 added in 0.32 M 4-aminothiophenol (4ATP) and then filled into the cell. 4ATP via electrostatic interaction can move its molecule to functionalize Ag nanoparticles. The negatively charged SiO2 controlled by external field could hinder 4ATP to adsorb on ITO glass, so the SERS signal could effectively modulated.


Keywords: Raman scattering, surface plasmon, metal nanoparticles, SiO2 nanospheres