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Communication

Thermal-sensitive ionogel with NIR-light controlled adhesion for ultrasoft strain sensor

Bing Lei1, Longxue Cao1, Xinyu Qu2, Yunlong Liu1, Jinjun Shao2, Qian Wang2(), Shuhong Li1(), Wenjun Wang1, Xiaochen Dong2,3()
School of Physical Science and Information Technology, Liaocheng University, Liaocheng 252059, China
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), School of Physical and Mathematical Sciences, Nanjing Tech University (NanjingTech), Nanjing 211816, China
School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, China
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An adhesive-controlled ionogel is prepared for ultrasoft flexible sensor with excellent sensing performance towards various stimuli, such as strain, pressure, and temperature.

Abstract

With the widespread prevailing of flexible electronics in human–machine interfaces, health monitor, and human motion detection, ultrasoft flexible sensors are urgently desired with critical demands in conformality. Herein, a temperature-sensitive ionogel with near-infrared (NIR)-light controlled adhesion is prepared by electrostatic interaction of poly(diallyl dimethylammonium chloride) (PDDA) and acrylic acid, as well as the incorporation of the conductive polydopamine modified polypyrrole nanoparticles (PPy-PDA NPs). The PPy-PDA NPs could weaken the tough interaction between polymer chains and depress the Young’s modulus of the ionogel, thus promoting the ionogel ultrasoft (34 kPa) and highly stretchable (1,013%) performance to tensile deformations. In addition, the high photothermal conversion capacity of PPy-PDA NPs ensured the ionogel excellent NIR-light controlled adhesion and temperature sensitivity, which facilitated the ionogel on-demand removal and promised a reliable thermal sensor. Moreover, the resulted ultrasoft flexible sensor exhibited high sensitivity and stability to both strain and pressure in a broad range of deformations, enabling a precise monitoring on various human motions and physiological activities. The temperature-sensitive, ultrasoft, and controlled adhesive capabilities prompted great potential of the flexible ionogel in medical diagnosis and wearable electronics.

Keywords

ultrasofttemperature-sensitivecontrollable adhesionphotothermal effectflexible sensor

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 4,
April 2023
Pages 5464-5472
DOI: 10.1007/s12274-022-5151-3
Cite this article:
Lei B, Cao L, Qu X, et al. Thermal-sensitive ionogel with NIR-light controlled adhesion for ultrasoft strain sensor. Nano Research, 2023, 16(4): 5464-5472. https://doi.org/10.1007/s12274-022-5151-3
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