羧甲基淀粉启用温度和应变双峰薄膜传感器的动态交联网络构建,ACS Applied Materials & Interfaces

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羧甲基淀粉启用温度和应变双峰薄膜传感器的动态交联网络构建
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-03-23 , DOI: 10.1021/acsami.3c01918
Jianzhen Wu ₁ , Yijie Liu ₁ , Shengming Hua ₁ , Fanjun Meng ₁ , Qinglin Ma ₁ , Shuliang Song ₁ , Yuju Che ₁

Affiliation

对于由惰性基底和水凝胶涂层交替层组成的薄膜传感器，在水凝胶涂层中构建刺激响应单元仍然具有挑战性。这里开发了一种有趣的带有羧甲基淀粉基水凝胶涂层的薄膜传感器。羧甲基淀粉的交联网络同时发挥结构构建单元和刺激控制单元的作用，赋予涂层热传感和应变传感能力。通过硼酸酯键形成的动态交联对温度敏感，随着温度的变化释放或消耗额外的酸离子，并且作为主要网络在半渗透聚丙烯酰胺链的帮助下赋予水凝胶强度和拉伸性。所以，所制备的柔性薄膜传感器可用于检测人体温度的周期性变化和具有多种工作模式的小尺度运动，判别与人体健康相关的物理状态。此外，这种基于淀粉的涂层在强碱性溶液中可降解，惰性基底层可以保护皮肤免受水凝胶与皮肤直接接触造成的侵蚀，因此薄膜传感器对人体和环境友好。这项工作还提出了一种通过调节化学网络而不是调整物理结构在薄膜传感器中构建温度敏感单元的策略。这种基于淀粉的涂层在强碱性溶液中可降解，惰性基底层可以保护皮肤免受水凝胶与皮肤直接接触造成的侵蚀，因此薄膜传感器对人体和环境友好。这项工作还提出了一种通过调节化学网络而不是调整物理结构在薄膜传感器中构建温度敏感单元的策略。这种基于淀粉的涂层在强碱性溶液中可降解，惰性基底层可以保护皮肤免受水凝胶与皮肤直接接触造成的侵蚀，因此薄膜传感器对人体和环境友好。这项工作还提出了一种通过调节化学网络而不是调整物理结构在薄膜传感器中构建温度敏感单元的策略。

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Dynamic Cross-Linking Network Construction of Carboxymethyl Starch Enabling Temperature and Strain Bimodal Film Sensors

Building stimulus-responsive units in the hydrogel coatings remains challenging for film sensors consisting of alternated layers of inert substrates and hydrogel coatings. An interesting film sensor with a carboxymethyl starch-based hydrogel coating was developed here. The cross-linking networks of carboxymethyl starch play the roles of structure-constructing units and stimulus-controlling units simultaneously, endowing the coatings with thermal sensing and strain sensing capabilities. The dynamic cross-links formed via the boronic ester bonds are temperature-sensitive, releasing or consuming additional acid ions with temperature alteration, and also as primary networks give the hydrogel strength and stretchability with the assistance of semi-penetrated polyacrylamide chains. Therefore, as-prepared flexible film sensors can be used to detect the periodic changes of human temperature and small-scale motion with multiple working modes, discriminating the physical states related to human health. Moreover, this kind of starch-based coating is degradable in a strongly alkaline solution and the inert substrate layer can protect the skin from erosion caused by direct hydrogel-skin contact, and thereby the film sensor is human- and environmentally friendly. This work also proposes a strategy of building temperature-sensitive units in the film sensor via regulating the chemical networks, instead of tuning physical structures.

更新日期：2023-03-23

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