期刊
ADVANCED SUSTAINABLE SYSTEMS
卷 2, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.201800085
关键词
electrical conductivity; PEDOT:PSS; Seebeck coefficient; steric effect; wearable device
资金
- National Natural Science Foundation of China [61504015, 21642013]
- Natural Science Foundation of Chongqing [cstc2017jcyjA0752]
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems [LLEUTS-2017004]
- Fundamental Research Funds for the Central Universities [106112017CDJQJ148805]
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a promising thermoelectric (TE) material. Nonetheless, its practical application is hindered by the poor TE properties of the pristine PEDOT:PSS and complicated treatment procedures. Enhancing its electrical conductivity is a key step for the improvement of TE properties. Here, a simple method is introduced to enhance the conductivity by adding sulfonic acid into the PEDOT:PSS solution. A systematic study of representative sulfonic acids with various functional groups suggests that steric effect induced by the functional groups has remarkable impact on the conductivity. The highest conductivity of 1996 S cm(-1) is observed in benzenesulfonic acid-doped PEDOT:PSS films. The doped PEDOT:PSS films are further treated with dimethyl sulfoxide and hydrazine successively or synchronously to tune the oxidation level. A maximum power factor (PF) of 203.1 mu W m(-1) K-2 is obtained. The high PF of treated PEDOT:PSS allows the realization of a flexible thermoelectric generator, which can generate 4.6 mV thermovoltage when attached on human skin. It also shows a good linear response with the increase of temperature difference; thus, it can be potentially used as a flexible thermal sensor. The facile fabrication process and good TE performance provide PEDOT:PSS an opportunity in wearable electronics.
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