摘要
作为柔性传感器的优良材料,导电水凝胶在人体可穿戴设备领域具有广泛的应用前景.将水凝胶基底聚乙烯醇(PVA)与乙二醇(EG)混合,制备了几种不同PVA质量比的PVA/EG导电水凝胶.针对10％、20％、30％PVA/EG水凝胶进行了结构和形态的表征,其中20％PVA/EG水凝胶的相对背景强度和晶体含量较高,且表面孔隙最多.通过万能材料试验机对20％PVA/EG导电水凝胶试样进行拉伸和压缩,测试了灵敏度、线性度、响应时间、稳定性和温度可靠性等传感性能.结果表明,导电水凝胶灵敏度系数最高达到0.74,线性相关系数达到0.987,响应时间低至80 ms,50次15％循环拉伸时的相对电阻变化基本恒定,且试样在-20 ℃低温下仍可正常工作.最后,将导电水凝胶试样粘贴在手指、脊椎和足部等人体不同部位,进行了运动试验,验证了该导电水凝胶在各类人体运动监测中的可行性.
Abstract
As an excellent material for flexible sensors,conductive hydrogels have broad prospects in the field of wearable devices.In this study,a series of PVA/EG conductive hydrogels with different mass ratios of PVA were prepared by mixing the hydrogel base polyvinyl alcohol(PVA)with ethylene glycol(EG).The structures and morphologies of 10％,20％,and 30％PVA/EG hydrogels were characterized,among which,the 20％PVA/EG hydrogel exhibited higher relative background intensity,crystalline content,and more surface pores.The sensing properties of the 20％PVA/EG conductive hydrogel,including sensitivity,linearity,response time,stability,and temperature reliability,were tested using a universal materials testing machine.The results showed that the sensitivity coefficient of the conductive hydrogel reached up to 0.74,the linear correlation coef-ficient reached 0.987,the response time was as low as 80 ms,and the relative resistance change remained rela-tively constant during 50 cycles of 15％stretching.Moreover,the hydrogel sample continued to function nor-mally at-20 ℃.Finally,the conductive hydrogel samples were attached to different parts of the body,such as fingers,spine,and feet,for motion experiments,validating the feasibility of the conductive hydrogel in various human motion monitoring scenarios.
维普
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