Preparation of Ag/Ag2W2O7 nanoribbons and their SERS detection for dye molecules

Ag[sub.2]W[sub.2]O[sub.7] nanoribbons were synthesized by hydrothermal method and then Ag/Ag[sub.2]W[sub.2]O[sub.7] NRs were developed by in situ chemical-reduction with NaBH[sub.4]. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy, and UV-vis spectroscopy, high-resolution transmission electron microscope (HRTEM), and Raman spectrum. In addition, methylene blue and Rhodamine B were selected as probe molecules to explore surface-enhanced Raman scattering effect of Ag/Ag[sub.2]W[sub.2]O[sub.7] NRs. It was found that the detection of limit and enhancement factor for methylene blue is 8.91 × 10[sup.−13] m and 2.78 × 10[sup.7], whereas the counterpart for Rhodamine B is 8.71 × 10[sup.−12] m and 4.34 × 10[sup.6] on the Ag/Ag[sub.2]W[sub.2]O[sub.7] NRs substrate. Relative standard deviation was not exceed 19% when methylene blue concentration reached 1.0 × 10[sup.−6] m, it can be seen that the substrate has good uniformity, strength stability and high repeatability, which can be applied to the detection of organic dyes and additives.