Tip-enhanced near-field Raman spectroscopy probing single dye-sensitized TiO_2 nanoparticles

摘要

The correlated metallic tip-enhanced Raman spectroscopy and atomic force microscopy (AFM) technique was used to characterize dye-sensitized titanium oxide (TiO_2) nanoparticles. We have obtained the near-field Raman spectra that are associated with the photo-induced charge transfer reaction in Ru(4,4'-dicarboxy-2,2'-bipyridine)_2(NCS)_2-sensitized TiO_2 single nanoparticles. This method demonstrates that tip-enhanced near-field Raman spectroscopy is an effective approach for understanding inhomogeneous interfacial electron transfers with nanoscale spatial resolution.