Bicyclic-ring base doping induces n-type conduction in carbon nanotubes with outstanding thermal stability in air

Shohei Horike (), Qingshuo Wei, Kouki Akaike, Kazuhiro Kirihara, Masakazu Mukaida, Yasuko Koshiba and Kenji Ishida
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Shohei Horike: Kobe University
Qingshuo Wei: National Institute of Advanced Industrial Science and Technology (AIST)
Kouki Akaike: National Institute of Advanced Industrial Science and Technology (AIST)
Kazuhiro Kirihara: National Institute of Advanced Industrial Science and Technology (AIST)
Masakazu Mukaida: National Institute of Advanced Industrial Science and Technology (AIST)
Yasuko Koshiba: Kobe University
Kenji Ishida: Kobe University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The preparation of air and thermally stable n-type carbon nanotubes is desirable for their further implementation in electronic and energy devices that rely on both p- and n-type material. Here, a series of guanidine and amidine bases with bicyclic-ring structures are used as n-doping reagents. Aided by their rigid alkyl functionality and stable conjugate acid structure, these organic superbases can easily reduce carbon nanotubes. n-Type nanotubes doped with guanidine bases show excellent thermal stability in air, lasting for more than 6 months at 100 °C. As an example of energy device, a thermoelectric p/n junction module is constructed with a power output of ca. 4.7 μW from a temperature difference of 40 °C.

Date: 2022
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DOI: 10.1038/s41467-022-31179-6

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