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Synergistic Impacts of Electrolyte Adsorption on the Thermoelectric Properties of Single‐Walled Carbon Nanotubes
Author(s) -
Nakano Motohiro,
Nakashima Takuya,
Kawai Tsuyoshi,
oguchi Yoshiyuki
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700804
Subject(s) - carbon nanotube , materials science , thermoelectric effect , seebeck coefficient , ionic liquid , raman spectroscopy , electrolyte , x ray photoelectron spectroscopy , optical properties of carbon nanotubes , ionic bonding , thermoelectric materials , selective chemistry of single walled nanotubes , carbon fibers , nanotechnology , chemical engineering , doping , thermal conductivity , chemistry , nanotube , ion , composite material , optoelectronics , electrode , organic chemistry , thermodynamics , composite number , engineering , optics , catalysis , physics
Single‐walled carbon nanotubes are promising candidates for light‐weight and flexible energy materials. Recently, the thermoelectric properties of single‐walled carbon nanotubes have been dramatically improved by ionic liquid addition; however, controlling factors remain unsolved. Here the thermoelectric properties of single‐walled carbon nanotubes enhanced by electrolytes are investigated. Complementary characterization with absorption, Raman, and X‐ray photoelectron spectroscopy reveals that shallow hole doping plays a partial role in the enhanced electrical conductivity. The molecular factors controlling the thermoelectric properties of carbon nanotubes are systematically investigated in terms of the ionic functionalities of ionic liquids. It is revealed that appropriate ionic liquids show a synergistic enhancement in conductivity and the Seebeck coefficient. The discovery of significantly precise doping enables the generation of thermoelectric power factor exceeding 460 µW m – 1 K –2 .