Fig. 3: Single-molecule level TERS images and effect of the Al2O3 capping layer.
From: Conformational heterogeneity of molecules physisorbed on a gold surface at room temperature
TERS mapping images of single BCB molecules measured with the excitation laser power of 220 μW and acquisition time of 0.5 s at each pixel at room temperature. TERS peak intensity images for in-plane symmetric stretching mode of O-C2 and N-C2 observed at ~580 cm−1 (a) and in-plane asymmetric stretching mode of O-C2 observed at ~1160 cm−1 (b). c TERS peak-to-peak intensity ratio image of ~580 cm−1 and ~1160 cm−1 peaks, arithmetically calculated from TERS images a and b after subtracting a background fluorescence signal. Yellow dashed circles in a–c indicate the same positions in the TERS images. d Time-series TERS spectra at a single fixed position. Source data are provided as a Source Data file.
