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Selective Etching via Soft Lithography of Conductive Multilayered Gold Films with Analysis of Electrolyte Solutions

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Ralph W. Gerber and Maria T. Oliver-Hoyo

Department of Chemistry, North Carolina State University, Raleigh, NC 27695

J. Chem. Educ., 2008, 85 (8), p 1108

DOI: 10.1021/ed085p1108

Publication Date (Web): August 1, 2008

Abstract

This experiment is designed to expose undergraduate students to the process of selective etching by using soft lithography and the resulting electrical properties of multilayered films fabricated via self-assembly of gold nanoparticles. Students fabricate a conductive film of gold on glass, apply a patterned resist using a polydimethylsiloxane stamp, and etch the unprotected gold. The resulting pattern is evaluated for changes in current, voltage flow, and resistance relative to the initial properties of the nonetched films. Students determine how changes in resistance applied to a conductive pattern affect the flow of current and voltage. Comparisons are made among different electrolyte solutions to demonstrate the electrical difference between strong, weak, and nonelectrolyte solutions, and how stronger electrolytes provide for better current flow.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Subject):

Nanotechnology

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

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  Effective teacher professional development programs for inclusion of nanoscience into the curriculum are paramount.
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