Investigation on SERS of different phase structure TiO₂ nanoparticles

Abstract

In this paper, anatase and rutile TiO2 nanoparticles as well as their mixed crystal phase structure TiO2 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 TiO2 nanoparticles. The mixed crystal structure TiO2 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 TiO2‐to‐molecule charge transfer mechanism and the mixed crystal effect. Copyright © 2015 John Wiley & Sons, Ltd.

Composition, microstructure and SERS properties of titanium nitride thin film prepared via nitridation of sol–gel derived titania thin films

“…. No apparent Raman signal was found from R6G molecule adsorbed on the thin film substrates nitrided at 600 °C, which was consistent with the other literature reported . As the R6G molecules were adsorbed on the thin film substrates nitrided at 700 °C and above temperatures, the characteristic Raman signal of R6G molecule was detected in all the samples, indicating that all the five samples had SERS activity.…”

Jahn-Teller reconstructed surface of the doped manganites shown by means of surface-enhanced Raman spectroscopy

“…The strongly localized character of the surface plasmon, i.e., its electric field E (r) SP scales with 1/r 3 , limits the probing area down to a few nanometers (d SP ≈ 4-5 nm) [38,39], making the study of the manganite surface by means of Raman spectroscopy in principle possible. However, up to now only a few studies were performed on oxides, mostly focused on nanoparticles rather than thin films [40][41][42]. Moreover, to the best of our knowledge, only one TERS study on a strongly correlated material, the double perovskite La 2 CoMnO 6 [43], was published, but no surface-oriented studies of the mixed-valence manganites, La 1−x A x MnO 3 , were reported up to now.…”

Recent advances in linear and non‐linear Raman spectroscopy. Part X

“…They found that the mixed crystal structure TiO 2 with an appropriate proportion of anatase and rutile phase is favorable to SERS enhancement of adsorbed molecules. These results are mainly attributed to the contributions of the TiO2‐to‐molecule charge transfer mechanism and the mixed crystal effect . Zhang et al .…”

“…These results are mainly attributed to the contributions of the TiO2-to-molecule charge transfer mechanism and the mixed crystal effect. [19] Zhang et al studied the size-dependent evolution of phonon confinement in colloidal Si nanoparticles using SERS. By introducing a variable confinement factor, α, into a well-known phenomenological phonon confinement model (PCM) developed by Richter et al, acceptable fits were achieved to downshifted and asymmetrically broadened Raman spectra of Si NPs with different diameters.…”