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V:\Desktop\Scanning Tunneling Microsopy


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Final project

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V:\Desktop\Scanning Tunneling Microsopy

  1. 1. Final Project<br />Robbie Lee<br />Scanning Tunneling Microsopy<br />
  2. 2. What is STM?<br />
  3. 3. STM is a microscope that can image at the atomic level. STM uses an atomically sharp tip to scan the surface of a sample. It scans across the sample using a constant current between the tip and the surface to map out the topography of the sample at an atomic level. STM is being used to develop nanotechnology.<br />
  4. 4. How Does It Work?<br />
  5. 5. What Kind of Tip Do I Use?<br />
  6. 6. What Kind of Sample Do I Use?<br />
  7. 7. What I Have Done(1)<br />
  8. 8. What I Have Done(2)-Dibenzo[a,l]pentacene<br />
  9. 9. Structure of Dibenzo[a,l]pentancene<br />
  10. 10. Why Failure?<br />Too Much Current; I used 1nA of current which was too much for the Dibenzo[a,l]pentacene. Too much current made bumps on the surface, which I thought of molecules <br />Silence; noisy sound occurs vibration<br /> Vacuum; less interference of air and sound<br />Cool temperature; it helps surface settle down<br />
  11. 11. How Can We Do To Change That?<br />Use similar conditions to scan Dibenzo[a,l]pentacene<br />Less Vibration<br />Less Noisome<br />Cool Temperature<br />
  12. 12. What I Have Learned<br />Large Tunneling Current vs. Small Tunneling Current<br />What To Do If The Scope Does Not Work Properly/Not Approacing<br />Vapor Deposit<br />Annealing<br />
  13. 13. Reflections on Experiencing in Research Class<br />