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In this report, the Raman enhancement of adsorbed dye molecules on a spin-cast 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, we determined 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 charge-transfer intensity contribution to the overall SERS enhancement. The as-prepared film showed itself to be extremely sensitive for the detection of CV dye molecules with a surface coverage of 12.732 pg cm−2, and the calculated enhancement factor reached 3.42 × 109.

materials advances

The surface-enhanced resonance Raman scattering of dye molecules adsorbed on two-dimensional titanium carbide Ti3C2Tx (MXene) film