American Chemical Society
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Thermal Conversion of Electronic and Electrical Properties of AuCl3-Doped Single-Walled Carbon Nanotubes

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journal contribution
posted on 2011-02-22, 00:00 authored by Seon-Mi Yoon, Un Jeong Kim, Anass Benayad, Il Ha Lee, Hyungbin Son, Hyeon-Jin Shin, Won Mook Choi, Young Hee Lee, Yong Wan Jin, Eun-Hong Lee, Sang Yoon Lee, Jae-Young Choi, Jong Min Kim
By using carbon-free inorganic atomic layer involving heat treatment from 150 to 300 °C, environmentally stable and permanent modulation of the electronic and electrical properties of single-walled carbon nanotubes (SWCNTs) from p-type to ambi-polar and possibly to n-type has been demonstrated. At low heat treatment temperature, a strong p-doping effect from Au3+ ions to CNTs due to a large difference in reduction potential between them is dominant. However at higher temperature, the gold species are thermally reduced, and thermally induced CNT−Cl finally occurs by the decomposition reaction of AuCl3. Thus, in the AuCl3-doped SWCNTs treated at higher temperature, the p-type doping effect is suppressed and an n-type property from CNT−Cl is thermally induced. Thermal conversion of the majority carrier type of AuCl3-doped SWNTs is systematically investigated by combining various optical and electrical tools.