Choi, Jaeyoo Jung, Yeonsu Yang, Seung Jae Oh, Jun Young Oh, Jinwoo Jo, Kiyoung Son, Jeong Gon Moon, Seung Eon Park, Chong Rae Kim, Heesuk 2024-01-20T01:02:06Z 2024-01-20T01:02:06Z 2021-09-04 2017-08 1936-0851 https://pubs.kist.re.kr/handle/201004/122497 As practical interest in flexible/or wearable power-conversion devices increases, the demand for high-performance alternatives to thermo-electric (TE) generators based on brittle inorganic materials is growing. Herein, we propose a flexible and ultralight TE generator (TEG) based on carbon nanotube yarn (CNTY) with excellent TE performance. The as prepared CNTY shows a superior electrical conductivity of 3147 S/cm due to increased longitudinal carrier mobility derived from a highly aligned structure. Our TEG is innovative in that the CNTY acts as multifunctions in the same device. The CNTY is alternatively doped into n- and p-types using polyethylenimine and FeCl3, respectively. The highly conductive CNTY between the doped regions is used as electrodes to minimize the circuit resistance, thereby forming an all-carbon TEG without additional metal deposition. A flexible TEG based on 60 pairs of n- and p-doped CNTY shows the maximum power density of 10.85 and 697 mu W/g at temperature differences of 5 and 40 K, respectively, which are the highest values among reported TEGs based on flexible materials. We believe that the strategy proposed here to improve the power density of flexible TEG by introducing highly aligned CNTY and designing a device without metal electrodes shows great potential for the flexible/or wearable power-conversion devices. English AMER CHEMICAL SOC POLYMER POWER THERMOPOWER COMPOSITES COMPLEX FABRICS FILMS Flexible and Robust Thermoelectric Generators Based on All-Carbon Nanotube Yarn without Metal Electrodes Article 10.1021/acsnano.7b01771 1 ACS NANO, v.11, no.8, pp.7608 - 7614 ACS NANO 11 8 7608 7614 scie scopus 000408520900007 2-s2.0-85028474474 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article POLYMER POWER THERMOPOWER COMPOSITES COMPLEX FABRICS FILMS carbon nanotube yarn thermoelectric properties flexible materials robust module energy conversion