Electrical properties of semiconducting single-walled carbon nanotubes (SWNTs) are controlled by encapsulating DNA into their inner nano-spaces using an ion irradiation method in electrolyte plasmas. Especially, DNA with guanine can drastically change the p-type characteristic of pristine SWNTs into the n-type characteristic, while DNA with cytosine just enhances the p-type characteristic. By measuring ultraviolet photoelectron spectra of SWNTs and DNA, it is clarified that the ionization potential of SWNTs is larger than that of DNA with guanine. This difference causes the charge transfer from DNA to SWNTs, resulting in the n-type semiconducting properties of the guanine encapsulated SWNTs.
ASJC Scopus subject areas
- Physics and Astronomy(all)