Reversible metal-semiconductor transition of ssDNA-decorated single-walled carbon nanotubes.
basic_science · Level V
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- Record sourced from PubMed, PMID 19256471.
- Also identified by DOI 10.1021/nl8029948.
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Abstract
A field effect transistor (FET) measurement of a single-walled carbon nanotube (SWNT) shows a transition from a metallic one to a p-type semiconductor after helical wrapping of DNA. Water is found to be critical to activate this metal-semiconductor transition in the ssDNA-SWNT hybrid. Raman spectroscopy confirms the same change in electrical behaviors. According to our ab initio calculations, a band gap can open up in a metallic SWNT with wrapped ssDNA in the presence of water molecules due to charge transfer.
Medical subject headings
- DNA, Single-Stranded
- Metals
- Nanotubes, Carbon
- Semiconductors