Sensitive substrate is the key factor, which may affect the enhancement effect of the SERS detection. SiO 2 /Ag hybrid nanospheres were synthesized by using (3-Aminopropyl) trimethoxysilane (APTES) modified SiO 2 nanospheres and [Ag(NH 3 ) 2 ] + ions, which would be used as very sensitive and homogeneous surface enhanced Raman scattering (SERS) substrates. Our results show that the –NH 2 groups were grafted on the surface of SiO 2 due to the modification of APTES, which promoted adsorption of Ag nanoparticles on the SiO 2 matrix. The effects of APTES on the micromorphology, chemical structure, and SERS performance of SiO 2 /Ag hybrid nanospheres were investigated by the SEM, XRD, and SERS measurements. Results indicated that the Ag nanoparticles were crystalline and the diameter of AgNPs ranged from 50 to 100 nm. SERS measurement showed that the surface electromagnetic enhancement would increase with number of AgNPs on SiO 2 nanospheres surface, and the mechanism explained by the FDTD simulation. Furthermore, our results indicate the highly uniformity and reproducibility of these substrates with the relative standard deviation (RSD) of peak intensity was 7.74%. The SiO 2 /Ag nanospheres with had high sensitivity, uniformity and reproducibility should be potential SERS applications.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Surfaces and Interfaces