Extremely sensitive and reusable surface-enhanced Raman scattering substrate based on 3D Ag-titanium dioxide nanowires

摘要

A three dimensional surface enhanced Raman scattering (SERS) substrate has been obtained by assembling Ag nanoparticles onto multilayered TiO2 nanowires (NWs) synthesized via modified hydrothermal method. The as-prepared Ag-TiO2 NW substrate exhibits high SERS sensitivity, achieving a detection limit of 10(-19) M for R6G solution. The rough surfaces and 3D porous network structure of Ag-TiO2 NWs cause strong adsorption of probe molecules. The small curvature radii, rough surfaces of the TiO2 NWs, and their intercrossed 3D network contribute to formation of abundant nanogaps. The substrate exhibits recyclability due to photocatalytic activity of TiO2. The Outstanding performance of the substrate facilitates the industrial application in the ultrasensitive chemical and biological molecule detection. (C) 2020 Elsevier B.V. All rights reserved.