The effect of STM parameters on tip-enhanced Raman spectra

• DOI: 10.1039/c7fd00164a
• Publication Date: 2017-05-17T15:23:15Z
• Authors: Natalia Martín Sa...; Amala Elizabeth; Jonas H. K. Pfist...; Katrin F. Domke
• Keywords: Thiophenol; Biasing; Intensity

In this work, we evaluate the dependence of tip-enhanced Raman (TER) spectra a monolayer thiophenol at Au(111) electrode on scanning tunneling microscope’s current set-point and bias voltage parameters. We find an increase TER intensity upon or decrease as expected from gap-distance reduction. The relations obtained follow theoretical model considering simple change when tuning mentioned that value affects to larger extent than set-point. Therefore it is advisable work in low-bias regime aiming for ultrasensitive measurements.