Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 2, Pages 1093-1101Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01673
Keywords
directly spun carbon nanotube web; doping process; brush-casting; flexible thermoelectric module; thermal sensor
Funding
- KRICT Core Project
- R&D Convergence Program of the National Research Council of Science and Technology of the Republic of Korea
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With increasing attention on flexible or wearable power-conversion devices, intensive research efforts have been devoted to flexible organic thermoelectric (TE) modules to replace the brittle inorganic ones. In this study, a highly integrated and flexible TE module with a novel device architecture based on a carbon nanotube (CNT) web is proposed. The pristine CNT web shows great electrical conductivity of 998.3 S cm(-1) with the highly aligned structure, owing to the increased carrier mobility in the longitudinal direction. To realize optimal TE property, the pristine CNT web is alternately doped with p- and n-type carriers using FeCl3 and benzyl viologen, respectively, via a brush-casting method. Brush-casting is the simple doping process that enables large-area and continuous fabrication of flexible TE modules by allowing precise doping of the localized area without a shadow mask. Flexible TE modules were then fabricated by repeated brushing and folding of the CNT webs. Owing to the synergic effect of the highly integrated high-performance TE material (highly aligned CNT web) and the facile doping process (brush-casting), flexible TE modules consisting of 120 p-n couples over an area of 8 cm(2) show a maximum power output of 5.3 mu W for a temperature difference of 11.7 K.
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