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Journal Article

Preparation of gold tips suitable for tip-enhanced Raman spectroscopy and light emission by electrochemical etching

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Picardi,  Gennaro
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Pettinger,  Bruno
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Ren, B., Picardi, G., & Pettinger, B. (2004). Preparation of gold tips suitable for tip-enhanced Raman spectroscopy and light emission by electrochemical etching. Review of Scientific Instruments, 75(4), 837-841. doi:10.1063/1.1688442.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-0CD1-D
Abstract
We describe a method of preparing gold scanning tunneling microscopy (STM) tips by direct current electrochemical etching in concentrated HCl and ethanol solution. Gold tips with tip apex radius lower than 30 nm can be reproducibly prepared by this method. The influence of the solution composition, etching voltage on the surface structure, and sharpness has been investigated. These tips can be efficiently used for STM imaging, tip-enhanced Raman spectroscopy, and light emission investigations on the same sample.