Ionic shape memory polymer gels as multifunctional sensors

Novel ionic shape memory polymer (SMP) gels were fabricated using SMPs and ionic liquids (ILs) of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) at different weight ratios ( W IL ). The shape memory effect and sensor performance of the ionic SMP gels were investigated by me...

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Bibliographic Details
Published in:Soft matter 2022-09, Vol.18 (36), p.6791-6799
Main Authors: An, YingJun, Yoshida, Haruki, Jing, Yuxin, Liang, Tian, Okuzaki, Hidenori
Format: Article
Language:English
Subjects:
Bending
Gels
Ionic liquids
Motion sensors
Open circuit voltage
Polymer gels
Polymers
Sensor arrays
Sensors
Shape effects
Shape memory
Thermomechanical analysis
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Summary:Novel ionic shape memory polymer (SMP) gels were fabricated using SMPs and ionic liquids (ILs) of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) at different weight ratios ( W IL ). The shape memory effect and sensor performance of the ionic SMP gels were investigated by means of thermomechanical and mechanoelectrical analyses. It was found that the ionic SMP gel at W IL = 25 wt% showed a shape memory effect with the shape fixing ratio ( R f ) and shape recovery ratio ( R r ) of 72.7% and 72.9%, respectively. Upon bending, the ionic SMP gel sensors with PEDOT:PSS electrodes generated an open circuit voltage of 3.3 mV and a charge of 1.6 nC which linearly increased with increasing bending displacement and velocity, respectively. Furthermore, the wearable shape memory multifunctional sensor array was demonstrated as a self-powered motion sensor for IoT applications. The wearable shape memory multifunctional sensor array is capable of sensing both direction and quantity of bending displacement and velocity.
ISSN:1744-683X
1744-6848
DOI:10.1039/d2sm00515h