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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > September  >
In the Laboratory
Getting Close with the Instructional Scanning Tunneling Microscope
Carl Steven Rapp
East Tennessee State University, University School, Box 70632, Johnson City, TN 37614

Cover
September 1997
Vol. 74 No. 9
p. 1087

Abstract
Scanning Tunneling Electron Microscopy (STEM) is a powerful technique that provides magnification of conducting surfaces to the atomic level. My recent experience as a member of a group of twenty teachers selected to work for eight summer weeks with scientists at Xerox Corporation and professors at the University of Rochester has opened new vistas for me and my high school students. We learned to use the Burleigh Instructional Scanning Tunneling Microscope (ISTM), an instrument designed for educational use by the University of Rochester, Xerox Corporation, and Burleigh Instrument Inc. While the images we can produce are not of the same quality as are often seen in the research literature, care in making a sharp, uncontaminated scanning tip and data collection in a vibration-free area, can result in pictures that are more than adequate for the introduction of "atomic eyes" to my classroom.

The ISTM is useful in the study of the effect of acids and bases on metals and the surfaces of semiconductors (some experiments are described below). Cutting the platinum-iridium tip or preparing the tungsten tip and mounting the sample are hands-on activities that give students a glimpse of the technological nanoworld. This state-of-the-art instrumentation is making it possible for students to actually view atoms in their own classroom. What is truly amazing, however, is that the ISTM can be set up and atomic resolution images obtained in about an hour.

See Letter re: this article.

More Information
*  Citation
Rapp, Carl Steven. J. Chem. Educ. 1997 74 1087.
*  Keywords
Instrumental Methods, Introductory/High School Chemistry, Atomic Properties/Structure, and Computer Assisted Instruction
*  History
Created:
Last Updated:
July 28, 1999
June 23, 2005
Link to Letter added (May 2004).
  Home > JCE Print > Journal of Chemical Education > Issues > 1997 > September > Page 1087



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