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Scanning Tunneling Microscope - How Nanoscientists see Atoms

This podcast is drawn from the "Virtual Lab" of WeCanFigureThisOut.org. This Virtual Lab uses 3D virtual reality animations to explain electronics, microelectronics and nanotechnology. This podcast explains how scanning tunneling microscopes (STM's) work. STM's are one the nanoscientist's best tools for seeing individual atoms.

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  1. 16

    All of the scenes together

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  2. 15

    This podcast is drawn from the Virtual Lab presentations of WeCanFigureThisOut.org. The copyrighted material of this site was developed under funding from National Science Foundation CCLI, NIRT, MRSEC and NUE programs. This project is led by John C. Bean

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  3. 14

    Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

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  4. 13

    To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

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  5. 12

    The heart of the STM is an atomically sharp probe.

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  6. 11

    A voltage induces electrons to jump from the probe's tip to the sample atoms.

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  7. 10

    A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

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  8. 9

    But how can it move the probe over these tiny nanometer distances?

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  9. 8

    Voltages to a piezoelectric crystal move the probe in and out.

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  10. 7

    Another crystal moves it side to side.

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  11. 6

    A third crystal moves it up and down.

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  12. 5

    Let's see how these work together to create an atomic scale map of the sample surface.

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  13. 4

    The voltage to the back crystal determines pixel color. Voltages on the other crystals move the probe and pixels side-to-side and up-and-down.

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  14. 3

    But how do we first position the probe only a nanometer or so from the sample surface?

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  15. 2

    It's done by ratcheting this cylinder in until an electron current is sensed.

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  16. 1

    This STM is so simple that we use it in UVA classes. But it also earned two physicists the Nobel Prize in 1986.

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ABOUT THIS SHOW

This podcast is drawn from the "Virtual Lab" of WeCanFigureThisOut.org. This Virtual Lab uses 3D virtual reality animations to explain electronics, microelectronics and nanotechnology. This podcast explains how scanning tunneling microscopes (STM's) work. STM's are one the nanoscientist's best tools for seeing individual atoms.

HOSTED BY

John C. Bean - WeCanFigureThisOut.org

CATEGORIES

science technology

Frequently Asked Questions

How many episodes does Scanning Tunneling Microscope - How Nanoscientists see Atoms have?

Scanning Tunneling Microscope - How Nanoscientists see Atoms currently has 16 episodes available on PodParley. New episodes are automatically indexed when they're published to the podcast feed.

What is Scanning Tunneling Microscope - How Nanoscientists see Atoms about?

This podcast is drawn from the "Virtual Lab" of WeCanFigureThisOut.org. This Virtual Lab uses 3D virtual reality animations to explain electronics, microelectronics and nanotechnology. This podcast explains how scanning tunneling microscopes (STM's) work. STM's are one the nanoscientist's best...

How often does Scanning Tunneling Microscope - How Nanoscientists see Atoms release new episodes?

Scanning Tunneling Microscope - How Nanoscientists see Atoms has 16 episodes. Check the episode list to see recent publication dates and frequency.

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You can listen to Scanning Tunneling Microscope - How Nanoscientists see Atoms on PodParley by clicking any episode. We provide an embedded audio player for direct listening, and you can also subscribe via your preferred podcast app using the RSS feed.

Who hosts Scanning Tunneling Microscope - How Nanoscientists see Atoms?

Scanning Tunneling Microscope - How Nanoscientists see Atoms is created and hosted by John C. Bean - WeCanFigureThisOut.org.
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