Journal
NANO ENERGY
Volume 100, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107542
Keywords
Ionic thermoelectric; Thermopower; Self -healing; Stretchable; Ionogels
Categories
Funding
- Hong Kong General Research Fund [16206020]
- Beijing Institute of Collaborative Innovation [BICI22EG02]
- Center on Smart Sensors and Environmental Technologies the Hong Kong University of Science and Technology [IOPC-F21EG01]
- Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone [HZQB-KCZYB-2020083]
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This study reports on a flexible ionic thermoelectric material for ultrasensitive thermal detection. The material exhibits large and tunable p- and n-type thermopowers, as well as stretchability and self-healing properties.
Flexible ionic thermoelectric materials with large thermopowers show great promise for ultrasensitive thermal detection in wearable devices. Here large and tunable p- and n-type thermopowers are reported in stretchable and self-healing ionogels made of a fluorocarbon elastomer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), an ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) and a salt acting as the thermopower regulator. Particularly, a self-healing n-type ionic thermoelectric material is developed for the first time. The thermopower of the resultant ionogels varies from + 30 mV K-1 to - 21 mV K-1 at 90% relative humidity. Meanwhile, the ionogels exhibit excellent stretchability up to 1700% and appropriate Young's modulus of around 0.26 MPa. Both the mechanical and thermoelectric properties can self-heal spontaneously after damage. Taking advantage of the large p and n-type thermopowers, the stretchable self-healing ionogels are integrated as a flexible thermoelectric detector with 10 pairs of p- and n-type legs on copper electrodes, showing a total thermopower of 0.25 V K- 1 operating with a low temperature difference of 1-2 K.
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