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Electrically, Thermally, and Mechanically Anisotropic Gels with a Wide Operational Temperature Range

Authors
Van Tron TranMredha, Md Tariful IslamLee, YoonseongTodo, MitsuguSo, HongyunJeong, EunjuPark, WoosungJeon, Insu
Issue Date
Apr-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
anisotropic gels; electrical conductivity; mechanical properties; thermal conductivity; wide temperature applicability
Citation
ADVANCED FUNCTIONAL MATERIALS, v.32, no.14, pp.1 - 11
Journal Title
ADVANCED FUNCTIONAL MATERIALS
Volume
32
Number
14
Start Page
1
End Page
11
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151302
DOI
10.1002/adfm.202110177
ISSN
1616-301X
Abstract
Next-generation applications, such as flexible electronic devices, sensors, actuators, and soft robotics, require anisotropic functional soft materials with controlled, directional electrical and heat conductivities, mechanical properties, and responsiveness, as well as shape-morphing capability, complex designability, and wide operational temperature ranges. However, a combination of these functions in any single class of materials has been very rarely seen to date. In this study, a novel class of multi-anisotropic gels is developed to realize all these functions through a new fabrication route. The gels are synthesized by integrating cellulose with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in tripropylene glycol. The prepared gels exhibit high electrical and thermal conductivities of approximate to 200 S m(-1) and approximate to 1.49 W m(-1) K-1, respectively, with exceptional Young's modulus (approximate to 500 MPa) and tensile strength (approximate to 55 MPa), which are much better than the previously reported mechanical properties of PEDOT-based gels (modulus/strength <= 10 MPa). Moreover, the gels exhibit self-welding ability and maintain their properties for 14 d over a wide temperature range (from -50 to 35 degrees C), covering almost the entire atmospheric temperature range on Earth surface. It is believed that the developed gels are promising candidates for application in many next-generation flexible devices, some of which are experimentally demonstrated in this study.
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