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Controlled production and electrical characterization of defects in carbon nanotubes

Controlled production and electrical characterization of defects in carbon nanotubes. Brett Goldsmith Collins Group Department of Physics and Astronomy. Production of Defects (functionalization). Electrochemical defect creation I(V) of nanotubes with an added defect

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Controlled production and electrical characterization of defects in carbon nanotubes

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  1. Controlled production and electrical characterization of defects in carbon nanotubes Brett Goldsmith Collins Group Department of Physics and Astronomy

  2. Production of Defects (functionalization) • Electrochemical defect creation • I(V) of nanotubes with an added defect • Field sensitivity of a created defect • Local resistance of a created defect • Enhancement of Chemical reactivity

  3. 1. Electrochemical Setup Source PMMA PMMA • electrochemistry in acidic solution • monitor current through the nanotube during electrochemistry Drain Mannik et al. PRL (2006) Goldsmith el al. Science (2007)

  4. 2. I(V) of Created Defects created defects show tunneling behavior

  5. Tunneling?

  6. Thermally Assisted Tunneling Mannik et al. PRL (2006)

  7. Drain Source VSD VF Vtip 3. Localized Field Sensitivity - SGM • Record current through the nanotube circuit while scanning with a gate probe. • Measures local field sensitivity • Shows where the device is “gate sensitive” nanotube with a created defect a normal nanotube

  8. Drain Source VSD VF Vtip 4. Local Resistance - KFM • Records forces between tip and sample • Measures Surface Potential • Allows indirect measurement of local resistance A nanotube with a created defect Scanned Gate image KFM image of a normal nanotube Drain KFM image Source

  9. 5. Chemical reactivity of Produced Defects PMMA Pd PMMA Goldsmith el al. Science (2007)

  10. Dr. Phil Collins Brett Goldsmith Alex Kane Bucky Khalap Steve Hunt Danny Wan Summary • Electrochemical functionalization • Thermally assisted tunneling • Field sensitivity of created defect • Local resistance of created defect • Chemical reactivity of created defects ACS-PRF

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