Mesogenic polymer composites for temperature-programmable thermoelectric ionogels

Sienoh Park, Byeonggwan Kim, Cheolhyun Cho, Eunkyoung Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Thermally programmable ionic thermoelectric (iTE) composites with optical tunability are explored as a transmittance tunable energy harvester to operate as a thermal sensor for low-grade heat sources. Liquid crystalline ionogels (LCIs) for iTE films are prepared via photopolymerization of ionic monomers (2-acrylamido-2-methyl-1-propanesulfonic acid) and hydrophobic nematic monomers (4-methoxyphenyl 4-((6-(acryloyloxy)hexyl)oxy)benzoate) in the presence of an ionic liquid. The LCI film shows reversible temperature programmability as well as fast transmittance switching at 65 °C, at which temperature the nematic-isotropic phase transition occurs. The LCI film for the iTE device shows a phase-controlled ionic Seebeck coefficient of −5.9 mV K−1 at 80% RH and produces a maximum thermoelectric power factor of 2.4 nW m−1 K−2. Taking advantage of the reversible thermoresponsiveness, the LCI iTE film is used to demonstrate a self-detectable and wireless fire alarm, which enables detection of elevated temperatures with the naked eye. Furthermore, the LCI iTE film is integrated as a thermal switch for an electrochromic window, a liquid crystal display, or a light-emitting diode to realize autonomous self-powered electronics that can be used to detect and view temperature changes in the environment.

Original languageEnglish
Pages (from-to)13958-13968
Number of pages11
JournalJournal of Materials Chemistry A
Issue number26
Publication statusPublished - 2022 Jun 15

Bibliographical note

Funding Information:
S. P. and B. K. contributed equally to this work. This research was supported by a National Research Foundation (NRF) grant funded by Korean government (Ministry of Science, ICT & Future Planning, MSIP) through the Global Research Lab (GRL: 2016K1A1A2912753), Creative Materials Discovery Program (2018M3D1A1058536), and Basic Science Research Program (2020R1I1A1A01057070). B. Kim thanks the Korea Initiative for fostering University of Research and Innovation Program of NRF (2020M3H1A1077207).

Publisher Copyright:
© 2022 The Royal Society of Chemistry

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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