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STM

STM. Scanning Tunneling Microscope Viewing Scans and Questions (Activity) Developed by Malory M. Peterson, Summer 2006 Nanotechnology Grant National Science Foundation #0532516. Becoming Familiar With the STM. Start by checking out the STM and identifying the different parts of the machine.

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STM

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  1. STM Scanning Tunneling Microscope Viewing Scans and Questions (Activity) Developed by Malory M. Peterson, Summer 2006 Nanotechnology Grant National Science Foundation #0532516

  2. Becoming Familiar With the STM • Start by checking out the STM and identifying the different parts of the machine. • Tip • Controller • Sample • Sample Holder • On your worksheet, Draw a schematic of how the STM works. Make sure you understand your schematic.

  3. Scans • Look at the large scans (400 nm – 500 nm) and locate level areas. • Zoom in • Review the smaller scan area (2 nm – 4 nm) and draw a picture on your worksheet of what the scan looks like. • Identify a molecule, if you can, and estimate its size. • Do not forget to label the axis in your drawing.

  4. Additional Questions • What does nanotechnology mean? • What is the purpose of the air bags and sand on the STM cart? • Remembering that heat makes particles excited; would it be easier or harder to scan at higher temperatures? Why? • Why does the STM tip have to be as sharp as possible (ideally, the size of a single atom)? • What are two ways we “see” the layers in the HOPG. • What do the letters in STM stand for? • How does “indirect observation” relate to the STM?

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