controlled production and electrical characterization of defects in carbon nanotubes brett goldsmith...
TRANSCRIPT
Controlled production and electrical characterization of defects in carbon
nanotubes
Brett Goldsmith
Collins Group
Department of Physics and Astronomy
Production of Defects (functionalization)
1. Electrochemical defect creation
2. I(V) of nanotubes with an added defect
3. Field sensitivity of a created defect
4. Local resistance of a created defect
5. Enhancement of Chemical reactivity
ReferenceCounter
Source Drain
PMMAcoating
Electrolytedrop
ReferenceCounter
Source Drain
PMMAcoating
Electrolytedrop
1. Electrochemical Setup
• electrochemistry in acidic solution• monitor current through the nanotube
during electrochemistry
PMMA
PMMA
Source
Drain
Mannik et al. PRL (2006) Goldsmith el al. Science (2007)
2. I(V) of Created Defects created defects show tunneling behavior
Tunneling?
Thermally Assisted Tunneling
Mannik et al. PRL (2006)
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”
Source
VSD
Vtip
Drain
VF
a normal nanotube nanotube with a created defect
4. Local Resistance - KFM• Records forces between tip and
sample• Measures Surface Potential• Allows indirect measurement of
local resistance
Source
VSD
Vtip
Drain
VF
Drain
Source
KFM image of a normal nanotubeA nanotube with a created defectScanned Gate image
KFM image
5. Chemical reactivity of Produced Defects
PMMA
PMMA
Pd
Goldsmith el al. Science (2007)
Summary
Engineering the Microworld at The University of California, IrvineUCI Integrated Nanosystems Research Facility
Dr. Phil Collins
Brett GoldsmithAlex KaneBucky KhalapSteve HuntDanny WanACS-PRF
1. Electrochemical functionalization
2. Thermally assisted tunneling
3. Field sensitivity of created defect
4. Local resistance of created defect
5. Chemical reactivity of created defects
ReferenceCounter
Source Drain
PMMAcoating
Electrolytedrop