Accession Number:

ADA282464

Title:

Electrochemical Deposition of Metal Nano-Disk Structures Using the Scanning Tunneling Microscope

Descriptive Note:

Interim rept. May 1993-Jun 1994

Corporate Author:

CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY

Report Date:

1994-07-13

Pagination or Media Count:

12.0

Abstract:

Silver nanodisk structures were electrochemically deposited on graphite surfaces using a scanning tunneling microscope STM. The deposition of metal occurs via a two-step mechanism involving the fast 2-5 microsec formation of a 7A-deep pit in the graphite surface, followed by nucleation and diffusion limited electrochemical deposition at this pit. An electrolysis time of 50 microsec produces diffusion-limited nanostructure dimensions of approx. 200-400A in diameter and 20-50A in height. Silver nanodisk structures are stable in dilute aqueous solutions containing Ag at small approx. 20mV sample- negative imaging biases, but are unstable with respect to dissolution at sample positive biases or when immersed in a pure water ambient irrespective of the applied bias. The mechanism of discharge of a nanometer-scale battery consisting of copper anodes and silver cathodes is examined. Scanning tunneling microscopy, STM, Lithography, Deposition

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Crystallography
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE