Extremely Deformable, Transparent, and High-Performance Gas Sensor Based on Ionic Conductive Hydrogel.
Extremely Deformable, Transparent, and High-Performance Gas Sensor Based on Ionic Conductive Hydrogel.
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DOI：
10.1021/acsami.8b17437
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发表时间：
2018-12
影响因子：
9.5
通讯作者：
Jin Wu;Zixuan Wu;Songjia Han;Bo‐Ru Yang;Xuchun Gui;K. Tao;Chuan Liu;J. Miao;L. Norford
中科院分区：
文献类型：
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作者：
Jin Wu;Zixuan Wu;Songjia Han;Bo‐Ru Yang;Xuchun Gui;K. Tao;Chuan Liu;J. Miao;L. Norford
可拉伸化学传感器的制造对于环境监测和医疗保健中的新兴可穿戴应用变得越来越有吸引力。在这里，第一次，化学衍生的离子导电聚丙烯酰胺/角叉菜胶双网络（DN）水凝胶被用来制造超拉伸和透明的NO2和NH3传感器，具有高灵敏度（78.5 ppm-1）和低理论检测限（1.2 ppb）在NO2检测。水凝胶可以承受各种严格的机械变形，包括高达1200%的应变，大范围的弯曲和扭曲。剧烈的机械变形不会降低气敏性能。设计了一种简单的溶剂替换策略，用甘油（Gly）分子部分取代水凝胶溶剂中的水，生成水-Gly二元水凝胶，其对NO2的灵敏度提高了1.68倍，稳定性显著提高。DN-Gly NO2传感器可保持其灵敏度长达9个月。高灵敏度归因于精心设计的聚合物链和溶剂中丰富的含氧官能团。提出了一种气体阻塞机制来理解气体传感器的正电阻漂移。这项工作揭示了利用离子导电水凝胶作为新型通道材料，设计高度可变形和敏感的气体传感器。
Fabrication of stretchable chemical sensors becomes increasingly attractive for emerging wearable applications in environmental monitoring and health care. Here, for the first time, chemically derived ionic conductive polyacrylamide/carrageenan double-network (DN) hydrogels are exploited to fabricate ultrastretchable and transparent NO2 and NH3 sensors with high sensitivity (78.5 ppm-1) and low theoretical limit of detection (1.2 ppb) in NO2 detection. The hydrogels can withstand various rigorous mechanical deformations, including up to 1200% strain, large-range flexion, and twist. The drastic mechanical deformations do not degrade the gas-sensing performance. A facile solvent replacement strategy is devised to partially replace water with glycerol (Gly) molecules in the solvent of hydrogel, generating the water-Gly binary hydrogel with 1.68 times boosted sensitivity to NO2 and significantly enhanced stability. The DN-Gly NO2 sensor can maintain its sensitivity for as long as 9 months. The high sensitivity is attributed to the abundant oxygenated functional groups in the well-designed polymer chains and solvent. A gas-blocking mechanism is proposed to understand the positive resistance shift of the gas sensors. This work sheds light on utilizing ionic conductive hydrogels as novel channel materials to design highly deformable and sensitive gas sensors.