Scanning gate spectroscopy and its application to carbon nanotube defects.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 21280660.
- Also identified by DOI 10.1021/nl103935r and PMC identifier 3053432.
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Abstract
A variation of scanning gate microscopy (SGM) is demonstrated in which this imaging mode is extended into an electrostatic spectroscopy. Continuous variation of the SGM probe's electrostatic potential is used to directly resolve the energy spectrum of localized electronic scattering in functioning, molecular scale devices. The technique is applied to the energy-dependent carrier scattering that occurs at defect sites in carbon nanotube transistors, and fitting energy-resolved experimental data to a simple transmission model determines the electronic character of each defect site. For example, a phenolic type of covalent defect is revealed to produce a tunnel barrier 0.1 eV high and 0.5 nm wide.
Medical subject headings
- Microscopy
- Nanotubes, Carbon
- Spectrum Analysis