A tip-enhanced Raman instrument was set up based on a homemade optical fiber Raman head, a dispersive spectrograph, and a scanning tunneling microscope (STM) system. Electrochemical preparation of tip-enhanced Raman spectroscopy (TERS) Au tips was refined by using the etching current as ending point control, resulting in a success rate as high as 90%. The high quality Au tips allow the recording of STM images with molecular resolution and TERS spectra of nonresonant surface species on a single-crystal surface.
Tip-enhanced Raman spectroscopy for investigating adsorbed species on a single-crystal surface using electrochemically prepared Au tips
Xi Wang, Zheng Liu, Mu-De Zhuang, Hai-Ming Zhang, Xiang Wang, Zhao-Xiong Xie, De-Yin Wu, Bin Ren, Zhong-Qun Tian; Tip-enhanced Raman spectroscopy for investigating adsorbed species on a single-crystal surface using electrochemically prepared Au tips. Appl. Phys. Lett. 3 September 2007; 91 (10): 101105. https://doi.org/10.1063/1.2776860
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