Investigation on SERS of different phase structure TiO₂ nanoparticles

In this paper, anatase and rutile TiO 2 nanoparticles as well as their mixed crystal phase structure TiO 2 nanoparticles were synthesized by a sol‐hydrothermal method, and were served as active substrates for surface‐enhanced Raman scattering (SERS) study. The results show that the 4‐mercaptobenzoic acid probe molecules exhibit different degree SERS enhancements on the surface of different phase structure TiO 2 nanoparticles. The mixed crystal structure TiO 2 with an appropriate proportion of anatase and rutile phase is favourable to SERS enhancement of adsorbed molecules. These are mainly attributed to the contributions of the TiO 2 ‐to‐molecule charge transfer mechanism and the mixed crystal effect.