Reduction-Controlled Viologen in Bisolvent as an Environmentally Stable n-Type Dopant for Carbon Nanotubes
- Authors
- Kim, Soo Min; Jang, Jin Ho; Kim, Ki Kang; Park, Hyeon Ki; Bae, Jung Jun; Yu, Woo Jong; Lee, Ha Il; Kim, Gunn; Loc, Duong Dinh; Kim, Un Jeong; Lee, Eun-Hong; Shin, Hyeon-Jin; Choi, Jae-Young; Lee, Young Hee
- Issue Date
- Jan-2009
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.131, no.1, pp 327 - 331
- Pages
- 5
- Journal Title
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
- Volume
- 131
- Number
- 1
- Start Page
- 327
- End Page
- 331
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159053
- DOI
- 10.1021/ja807480g
- ISSN
- 0002-7863
1520-5126
- Abstract
- Various viologens have been used to control the doping of single-walled carbon nanotubes (SWCNTs) via direct redox reactions. A new method of extracting neutral viologen (V-0) was introduced using a biphase of toluene and viologen-dissolved water. A reductant of sodium borohydride transferred positively charged viologen (V2+) into V-0, where the reduced V-0 was separated into toluene with high separation yield. This separated VI solution was dropped on carbon nanotube transistors to investigate the doping effect of CNTs. With a viologen concentration of 3 mM, all the p-type CNT transistors were converted to n-type with improved on/off ratios. This was achieved by donating electrons spontaneously to CNTs from neutral V-0, leaving energetically stable V2+ on the nanotube surface again. The doped CNTs were stable in water due to the presence of hydrophobic V-0 at the outermost CNT transistors, which may act as a protecting layer to prevent further oxidation from water.
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