Working Model of an Atomic Force Microscope

Dr. Randall Headrick, David Hammond, Michael Hamblin, and Kirsten Bonson

University of Vermont
Main Model
    
      Relatively few laboratory experiments are available for introductory lab courses relating to nanoscience and nanotechnology. In order to explain the working principles of an atomic force microscope (AFM) to an introductory level physics class, we have created an inexpensive working model of an AFM using a modified phonograph stylus in place of the AFM cantilever and tip. The sample to be studied is positioned under the stylus using a micrometer stage, and a 10 mW laser diode is used to produce a beam, which reflects off a very small mirror glued to the end of the stylus. No electronic detection is used, rather students can measure the deflection of the tip directly from the movement of the laser beam on a piece of graph paper placed 50 cm from the mirror. The laser beam is deflected roughly a centimeter for each 10 microns of stylus deflection, making it simple for students to collect data. A one-dimensional trace is typically performed, however the instrument could be easily modified to produce a full two-dimensional scan.

      Due to increasing interest in this model and in the project in general, we have decided to make this site explaining the assembly of the working AFM model and the resources we used. In addition, we have included a link to the larger demonstration model which has been used to introduce students to the concept of atomic force microscopy before they use our working models in the lab.     



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AFM Poster


    Working Model of an Atomic Force Microscope Poster for NES APS / AAPT Meeting
(Click Here)

Demo Model


    Large-scale Demonstration Model                                                                                 
(Click Here)

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Model Construction:


Tip and Cantilever

Frame and Adjustment

Mirrors and Laser

Sample(s)

AutoCAD Drawings





Application:


In The Lab





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                                  Special Thanks To:

National Science Foundation under grant DMR-0348354 *

                                 College of Arts and Sciences Dean's Office at UVM*



*The opinions of this website are the author's alone and do not necessarily reflect the views of the National Science Foundation or the University of Vermont