Surface-enhanced resonance Raman scattering of dye molecule adsorbed on two-dimensional titanium carbide Ti3C2Tx (MXene) film

In this report, Raman enhancement of adsorbed dye molecules onto the spin-casted two-dimensional (2D) titanium carbide Ti3C2Tx (MXene) film via resonance Raman scattering so-called MXenes-enhanced resonance Raman scattering (MERRS) was observed. Based on the energy level diagram of the molecule-MXene system and we determine that the location of the charge-transfer transition from the HOMO of crystal violet (CV) to the Fermi level should be at or close to 1.9 eV. This indicates a considerable contribution of charge-transfer intensity to the overall SERS enhancement. The as-prepared film showed extremely sensitive for the detection of CV dye molecule with a surface coverage of 12.732 pg/cm2, and the calculated enhancement factor reaches 3.42 × 109.