温敏、磁响应水凝胶及其无线应变传感器、非接触式传感器研究在Colloids and Surfaces A发表。

题目：Thermoresponsive, magnetic, adhesive and conductive nanocomposite hydrogels for wireless and non-contact flexible sensors

文章信息：Colloids and Surfaces A, 2022, 636, 128113

论文链接：https://authors.elsevier.com/a/1eHAD3IywUI5cq

摘要：

Hydrogel sensors are increasingly investigated and applied in emerging flexible electronics, but the exploration of hydrogel sensors with multiple functionalities remains a challenge. In this work, thermoresponsive, magnetic, adhesive and conductive nanocomposite hydrogels are developed and further applied in fabricating multifunctional flexible sensors. In such nanocomposite hydrogels, poly(N-isopropyl acrylamide-co-acrylamide) (P (NIPAAm-co-Am)) and Fe3O4 nanoparticles are designed as the thermoresponsive and magnetic component respectively, poly(vinyl alcohol) (PVA) is introduced in a semi-interpenetrating way to enhance the adhesiveness and mechanical property, and potassium chloride (KCl) works as the conductive component. Interestingly, the adhesion property is switchable by temperature based on the thermoresponsiveness of the nanocomposite hydrogels. Resistive strain sensors assembled from the nanocomposite hydrogels achieve a gauge factor (GF) of 4.21, a response time of 140 ms, stability of 2000 sensing cycles and excellent reversibility. Such nanocomposite hydrogel sensors are used as wearable sensors for monitoring diverse human motions and further integrated with Bluetooth signal transmission and reception system to fabricate wireless wearable sensors. Because of the deformation of nanocomposite hydrogels in switching magnetic field, the nanocomposite hydrogel sensors also have the ability to respond in a non-contact way to switching magnetic fields.

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感谢国家自然科学基金、陕西省青年科技新星项目、陕西省高校青年杰出人才计划，陕西省自然科学基础研究计划、陕西省科协青年人才托举计划项目、陕西省教育厅重点实验室项目对本工作的资助。