A Low-modulus, Adhesive, and Highly Transparent Hydrogel for Multi-use Flexible Wearable Sensors
A Low-modulus, Adhesive, and Highly Transparent Hydrogel for Multi-use Flexible Wearable Sensors
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DOI：
10.1016/j.colsurfa.2022.130752
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Dongyang Yu;Yanhua Teng;Ninghong Zhou;Yiting Xu;Xiaobei Wang;Xiuling Lin;Qingping Wang;Changguo X
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文献类型：
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作者：
Dongyang Yu;Yanhua Teng;Ninghong Zhou;Yiting Xu;Xiaobei Wang;Xiuling Lin;Qingping Wang;Changguo X
柔性材料在可穿戴传感器中得到了广泛的应用，但其高模量和非粘附性阻碍了其广泛的应用。在这项工作中，聚丙烯酸（PAA）增强的羧甲基纤维素（CMC）水凝胶（PEC水凝胶）通过两步法制备用于柔性可穿戴传感器。水凝胶呈现超过90%（400 - 800 nm）的透明度。由于PAA和CMC之间的聚合物链缠结和非共价相互作用，水凝胶的拉伸性能得到增强，从而提供具有高拉伸率（492%）和低拉伸强度（<12.5kPa）的PEC水凝胶。基于水凝胶的电阻应变传感器表现出宽的感测范围（0 - 300%，GF = 3.16）、快速的响应时间（125 ms）和优异的耐久性（从0%到100%应变超过1500次循环）。由于极性基团的引入，该水凝胶可以粘附到各种基底上，在猪皮（人皮肤的替代物）上的剥离强度为53.97N/m。由于其低模量，粘附力和传感性能，水凝胶被组装成可穿戴的应变传感器，可以准确地检测多种人体运动。该水凝胶还应用于电容式压力传感器，该传感器具有快速响应时间（100 ms）和高灵敏度。本工作为制备用于多用途柔性可穿戴传感器的水凝胶提供了一种简便的方法。
Flexible materials have been widely applied in wearable sensors, but their high modulus and non-adhesion impede their widespread applications. In this work, a polyacrylic acid (PAA)-enhanced carboxymethyl cellulose (CMC) hydrogel (PEC hydrogel) was prepared via a two-step method to be utilized in flexible wearable sensors. The hydrogel presented a transparency of over 90 % (400–800 nm). Because of polymer chain entanglements and non-covalent interactions between PAA and CMC, the tensile properties of the hydrogel were enhanced, affording the PEC hydrogel with high stretchability (492 %) and low tensile strength (< 12.5 kPa). A hydrogel-based resistive strain sensor exhibited a wide sensing range (0–300 %, GF = 3.16), fast response time (125 ms), and excellent durability (over 1500 cycles from 0 % to 100 % strain). Owing to the introduction of polar groups, the hydrogel could be adhered to various substrates, and the peeling strength on pig skin (a replacement for human skin) was 53.97 N/m. Thanks to its low modulus, adhesion, and sensing performance, the hydrogel was assembled into a wearable strain sensor that accurately detected multiple human body movements. The hydrogel was also applied in a capacitive pressure sensor, which possessed a fast response time (100 ms) and high sensitivity. This work provides facile method for fabricating hydrogels used in Multi-use Flexible Wearable Sensors.