2020/10/29 by Yanfen Wang, Shuai Ma, Hai Yu +6
Materials Science · #Advanced Nanomaterials in Catalysis #Gold and Silver Nanoparticles Synthesis and Applications #Quantum Dots Synthesis And Properties
paper · doi:10.1088/1361-6528/abc5f4
openalex publication_date 2020/10/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Abstract Ag/TiO 2 nanostructure arrays were constructed on fluorine-doped tin oxide (FTO) via a controllable hydrothermal route and a magnetron sputtering method with a variety of TiO 2 arrays decorated by Ag nanoparticles. Effects of different TiO 2 arrays on the microstructure, composition, and optical properties of the samples were revealed. As surface enhanced Raman scattering (SERS) active substrates, we discussed the sensitivity and reproducibility of Ag/TiO 2 nanostructure arrays for Rhodamine 6G (R6G) molecule detection. It was found that TiO 2 nanosheet (TiO 2 (S)) array as a supporting made Ag nanoparticles have a uniform and continuous distribution, which achieved much higher SERS signals. The obtained Ag/TiO 2 (S) substrate had an improved enhancement factor of 4.31 × 10 5 compared with the other Ag/TiO 2 nanostructure arrays of nanorods, nanotubes, and nanotrees. Furthermore, Ag/TiO 2 (S) active substrate showed good reproducibility with low relative standard deviation values. Such a remarkable SERS activity could be due to the synergistic effect of electromagnetic enhancement and charge transfer enhancement. Moreover, the TiO 2 (S) array with high-exposed 101 facets provided a large adhesion area and generated a strong interaction with external atoms, which would produce high-density ‘hot spots’ of SERS.