Fabrication of SERS-active Au@Au@Ag double shell nanoparticles for low-abundance pigment detection
- Accepted Date: 2020-07-02
Abstract: Au@Au@Ag double shell nanoparticles were fabricated and characterized using TEM, STEM-Mapping and UV-Vis methods. Using crystal violet (CV) as Raman probe, the SERS activity of the as-prepared Au@Au@Ag nanoparticles was studied by comparing to Au, Au@Ag and Au@Au core-shell nanoparticles prepared by the same methods. Moreover, it can be found that the SERS activity was enhanced obviously by introducing of NaCl. The concentrations of NaCl played a key role in SERS detection. With appropriate concentration of NaCl, the limit of detection as low as 10?10 M CV can be achieved. The possible enhanced mechanism was also discussed. Furthermore, with simple sample pretreatment, the detection limit of 5 μg/g Rhodamine B (RhB) in chili powders can be achieved. The results highlight the potential utility of Au@Au@Ag for detection of illegal food additives with low concentrations.
|Citation:||WenxianWei. Fabrication of SERS-active Au@Au@Ag double shell nanoparticles for low-abundance pigment detection[J]. Chinese Journal of Chemical Physics .|