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

Abstract

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.

Authors:
; ; ; ;  [1]
  1. Department of Physics and Material Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
22392418
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ELECTRIC CONTACTS; ELECTRIC POTENTIAL; ELECTROCHEMISTRY; ETCHING; FABRICATION; GLYCEROL; GOLD; HYDROCHLORIC ACID; ROUGHNESS; SHAPE; SMOOTH MANIFOLDS; SPECTROSCOPY

Citation Formats

Narasiwodeyar, S., Dwyer, M., Liu, M., Park, W. K., E-mail: wkpark@illinois.edu, and Greene, L. H. Two-step fabrication technique of gold tips for use in point-contact spectroscopy. United States: N. p., 2015. Web. doi:10.1063/1.4913661.
Narasiwodeyar, S., Dwyer, M., Liu, M., Park, W. K., E-mail: wkpark@illinois.edu, & Greene, L. H. Two-step fabrication technique of gold tips for use in point-contact spectroscopy. United States. doi:10.1063/1.4913661.
Narasiwodeyar, S., Dwyer, M., Liu, M., Park, W. K., E-mail: wkpark@illinois.edu, and Greene, L. H. Sun . "Two-step fabrication technique of gold tips for use in point-contact spectroscopy". United States. doi:10.1063/1.4913661.
@article{osti_22392418,
title = {Two-step fabrication technique of gold tips for use in point-contact spectroscopy},
author = {Narasiwodeyar, S. and Dwyer, M. and Liu, M. and Park, W. K., E-mail: wkpark@illinois.edu and Greene, L. H.},
abstractNote = {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.},
doi = {10.1063/1.4913661},
journal = {Review of Scientific Instruments},
number = 3,
volume = 86,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}