Two-step fabrication technique of gold tips for use in point-contact spectroscopy

S. Narasiwodeyar, M. Dwyer, M. Liu, W. K. Park, L. H. Greene

Research output: Contribution to journalArticlepeer-review


For a successful point-contact spectroscopy (PCS) measurement, metallic tips of proper shape and smoothness are essential to ensure the ballistic nature of a point-contact junction. Until recently, the fabrication of Au tips suitable for use in point-contact spectroscopy has remained more of an art involving a trial and error method rather than an automated scientific process. To address these issues, we have developed a technique with which one can prepare high quality Au tips reproducibly and systematically. It involves an electronic control of the driving voltages used for an electrochemical etching of a gold wire in a HCl-glycerol mixture or a HCl solution. We find that a stopping current, below which the circuit is set to shut off, is a single very important parameter to produce an Au tip of desired shape. We present detailed descriptions for a two-step etching process for Au tips and also test results from PCS measurements using them.

Original languageEnglish (US)
Article number033903
JournalReview of Scientific Instruments
Issue number3
StatePublished - Mar 2015

ASJC Scopus subject areas

  • Instrumentation


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