Electric Field Induced Surface Modification of Au

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Description

We discuss the role of localized high electric fields in the modification of Au surfaces with a W probe using the Interfacial Force Microscope. Upon bringing a probe close to a Au surface, we measure both the interfacial force and the field emission current as a function of separation with a constant potential of 100 V between tip and sample. The current initially increases exponentially as the separation decreases. However, at a distance of less than {approximately} 500{angstrom} the current rises sharply as the surface begins to distort and rapidly close the gap. Retraction of the tip before contact is ... continued below

Physical Description

31 p.

Creation Information

Erchak, A. A.; Franklin, G. F.; Houston, J. E.; Mayer, T. M. & Michalske, T. A. February 15, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

We discuss the role of localized high electric fields in the modification of Au surfaces with a W probe using the Interfacial Force Microscope. Upon bringing a probe close to a Au surface, we measure both the interfacial force and the field emission current as a function of separation with a constant potential of 100 V between tip and sample. The current initially increases exponentially as the separation decreases. However, at a distance of less than {approximately} 500{angstrom} the current rises sharply as the surface begins to distort and rapidly close the gap. Retraction of the tip before contact is made reveals the formation of a mound on the surface. We propose a simple model, in which the localized high electric field under the tip assists the production of mobile Au adatoms by detachment from surface steps, and a radial field gradient causes a net flux of atoms toward the tip by surface diffusion. These processes give rise to an unstable surface deformation which, if left unchecked, results in a destructive mechanical contact. We discuss our findings with respect to earlier work using voltage pulses in the STM as a means of nanofabrication.

Physical Description

31 p.

Notes

OSTI as DE00003598

Medium: P; Size: 31 pages

Source

  • Journal Name: Journal of Applied Physics; Other Information: Submitted to Journal of Applied Physics

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  • Report No.: SAND99-0392J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 3598
  • Archival Resource Key: ark:/67531/metadc674586

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  • February 15, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 12, 2017, 1:10 p.m.

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Erchak, A. A.; Franklin, G. F.; Houston, J. E.; Mayer, T. M. & Michalske, T. A. Electric Field Induced Surface Modification of Au, article, February 15, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc674586/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.