Lee, Taemin Park, Kyung Tae Ku, Bon-Cheol Kim, Heesuk 2024-01-19T19:04:05Z 2024-01-19T19:04:05Z 2021-09-04 2019-09-28 2040-3364 https://pubs.kist.re.kr/handle/201004/119553 With the increase in practical interest in flexible thermoelectric (TE) generators, the demand for high-performance alternatives to brittle TE materials is growing. Herein, we have demonstrated wet-spun CNT fibers with high TE performance by systematically controlling the longitudinal carrier mobility without a significant change in the carrier concentration. The carrier mobility optimized by CNT alignment increases the electrical conductivity without decreasing the thermopower, thus improving the power factor. On further adjusting the charge carriers via mild annealing, the CNT fibers exhibit a high power factor of 432 mu W m(-1) K-2. Based on the excellent TE performance and shape advantages for modular design of the CNT fiber, the all-carbon based flexible TE generator without an additional metal electrode has been fabricated. The flexible TE generator based on 40 pairs of p- and n-type CNT fibers shows the maximum power density of 15.4 and 259 mu W g(-1) at temperature differences (Delta T) of 5 and 20 K, respectively, currently one of the highest values reported for TE generators based on flexible materials. The strategy proposed here can improve the performance of flexible TE fibers by optimizing the carrier mobility without a change in the carrier concentration, and shows great potential for flexible TE generators. English ROYAL SOC CHEMISTRY MACROSCOPIC FIBERS SINGLE POLYMER POWER CONDUCTIVITY FABRICATION COMPOSITES TRANSPORT DEVICES COMPLEX Carbon nanotube fibers with enhanced longitudinal carrier mobility for high-performance all-carbon thermoelectric generators Article 10.1039/c9nr05757a 1 NANOSCALE, v.11, no.36, pp.16919 - 16927 NANOSCALE 11 36 16919 16927 scie scopus 000496763600022 2-s2.0-85072508977 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article MACROSCOPIC FIBERS SINGLE POLYMER POWER CONDUCTIVITY FABRICATION COMPOSITES TRANSPORT DEVICES COMPLEX