Silica‐supported silver nano‐particles for surface‐enhanced Raman spectroscopy

Abstract

We have developed and prepared a new type of substrate by impregnating silica with silver for surfaceenhanced Raman scattering (SERS). The effects of several experimental conditions of preparation, including the drying temperature, the molar ratio of Ag to Si, the calcination time and the calcination temperature, were investigated and varied to give a better surface enhancement efficiency of the substrate. X-ray diffraction and transmission electron microscopy were used to measure the relative abundance of silver metal and the size of silver particles in the substrates. The results provided useful information that would be helpful in explaining the surface-enhanced performance of silica-supported silver substrates prepared under different conditions. The SERS spectra of several organic dyes were used to demonstrate the performance of the silver-silica substrate.

Novel Silver/Poly(vinyl alcohol) Nanocomposites for Surface‐Enhanced Raman Scattering‐Active Substrates

“…Figure 3 shows the XRD patterns of the PVA/Ag composite films stabilized at different PGA concentrations. According to Liu et al,19 Ag should have a diffraction pattern at 2 θ = 38.1 and 44.2°. It can be seen that the PVA/Ag film did not show a significant signal for the Ag phase in the absence of PGA.…”

Raman Spectroscopic Detection for Perchlorate at Low Concentrations

“…Although different methods for preparing Ag colloids may be equally effective in observing the SERS effect for perchlorate detection, 13 we used a modified method from Creighton et al 14 for the present study. In brief, a pale yellow Ag sol suspension was prepared by mixing 5 mL of 0.01 M AgNO 3 with 10 mL of freshly prepared sodium borohydride (0.01-0.015 M) solution, in which Ag ϩ ions are reduced to form Ag nanocolloidal particles.…”

Silver-Coated Zeolite Crystal Films as Surface-Enhanced Raman Scattering Substrates

“…1 , followed by calcination to reduce the silver ions to metallic silver. 10 Silica spheres containing homogeneously dispersed silver quantum dots prepared by photochemical reduction of silver ions in a microemulsion reaction matrix during the hydrolysis of tetraethyl orthosilicate (TEOS) have also been used as SERS substrates. 11 In addition to the various reduction procedures, vapor deposition is also a widely utilized technique to produce silver particles on solid supports.…”