Abstract
Scanning Tunneling Microscope (STM) based Tip-enhanced Raman Spectroscopy (TERS) was used to map Single-walled Carbon Nanotubes (SWCNTs) dispersed on silicon surfaces. A software program developed with Labview platform was used to perform the mapping. STM tips made of gold (Au) were fabricated by electrochemical etching and employed in our TERS system to realize nanoscale spatial resolutions and obtain enhanced signals. Mapping of the SWCNTs was also performed using a micro-Raman system. It was found that the SWCNTs could be well resolved by the TERS system but could not be resolved by the micro-Raman system. Further analysis shows that, the ultimate resolution of the TERS system can reach around 30 nm, while the micro-Raman system shows a resolution around 5 μm.
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