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Signatures of Chemical Defects in Carbon Nanotube Electronic Devices

Signatures of Chemical Defects in Carbon Nanotube Electronic Devices. Brett Goldsmith Collins Lab Department of Physics and Astronomy. A broad look at defects. Tools to Study CNT Defects. Fan, Nature Materials. December, 2005. Drain. Source. V SD. V F. V tip.

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Signatures of Chemical Defects in Carbon Nanotube Electronic Devices

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  1. Signatures of Chemical Defects in Carbon Nanotube Electronic Devices Brett Goldsmith Collins Lab Department of Physics and Astronomy

  2. A broad look at defects

  3. Tools to Study CNT Defects Fan, Nature Materials. December, 2005

  4. Drain Source VSD VF Vtip Scanning Probe Microscopy - KFM • Kelvin Force Microscopy (KFM): • Records forces between tip and sample • Measures Surface Potential • Allows indirect measurement of local resistance Source Drain

  5. Drain Source VSD VF Vtip Scanning Probe Microscopy - SGM • Scanned Gate Microscopy (SGM): • Records current through the nanotube circuit • Measures local field sensitivity • Shows where the device is “gate sensitive” topography topography + SGM

  6. Growth Defects - KFM Ballistic Nanotube Nanotube with Growth Defects

  7. Growth Defects – KFM detail Ballistic Nanotube Nanotube with Growth Defects:

  8. Growth Defects - SGM topography topography + SGM

  9. WE RE CE Vg Defect Creation on Nanotubes • Many ways to create defects: • Mechanical • Chemical • Irradiation • Electrochemical Jaan Mannik V18.7

  10. Basic Effects of Oxidation

  11. Basic Effects of Oxidation Weak Oxidation

  12. Basic Effects of Strong Oxidation Strong Oxidation

  13. Mild Oxidation - SGM topography topography + SGM

  14. One SWNT after Progressively Harsh Treatments • Surface Potential along as-grown CNT: Surface Potential after mild oxidation: Surface Potential after strong oxidation:

  15. Weak Defects - KFM Mildly Oxidized Nanotube Ballistic Nanotube

  16. Summary • Microscopy techniques such as KFM and SGM show that oxidation and growth defects have similar effects on CNT circuits. Dr. Yuwei Fan Dr. Jaan Mannik Brett Goldsmith Alex Kane Derek Kingrey Bucky Khalap Kevin Loutherback Fatima Alim Yasser Elliasal ACS-PRF

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