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Ion-Conductive Hydrogel-Based Stretchable, Self-Healing, and Transparent NO2 Sensor with High Sensitivity and Selectivity at Room Temperature
Small ( IF 13.0 ) Pub Date : 2021-10-20 , DOI: 10.1002/smll.202104997 Zixuan Wu 1 , Limin Rong 1 , Jinglan Yang 1 , Yaoming Wei 1 , Kai Tao 2 , Yubin Zhou 3 , Bo-Ru Yang 1 , Xi Xie 1 , Jin Wu 1
Small ( IF 13.0 ) Pub Date : 2021-10-20 , DOI: 10.1002/smll.202104997 Zixuan Wu 1 , Limin Rong 1 , Jinglan Yang 1 , Yaoming Wei 1 , Kai Tao 2 , Yubin Zhou 3 , Bo-Ru Yang 1 , Xi Xie 1 , Jin Wu 1
Affiliation
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Here stretchable, self-healable, and transparent gas sensors based on salt-infiltrated hydrogels for high-performance NO2 sensing in both anaerobic environment and air at room temperature, are reported. The salt-infiltrated hydrogel displays high sensitivity to NO2 (119.9%/ppm), short response and recovery time (29.8 and 41.0 s, respectively), good linearity, low theoretical limit of detection (LOD) of 86 ppt, high selectivity, stability, and conductivity. A new gas sensing mechanism based on redox reactions occurring at the electrode–hydrogel interface is proposed to understand the sensing behaviors. The gas sensing performance of hydrogel is greatly improved by incorporating calcium chloride (CaCl2) in the hydrogel via a facile salt-infiltration strategy, leading to a higher sensitivity (2.32 times) and much lower LOD (0.06 times). Notably, both the gas sensing ability, conductivity, and mechanical deformability of hydrogels are readily self-healable after cutting off and reconnection. Such large deformations as 100% strain do not deprive the gas sensing capability, but rather shorten the response and recovery time significantly. The CaCl2-infiltrated hydrogel shows excellent selectivity of NO2, with good immunity to the interference gases. These results indicate that the salt-infiltrated hydrogel has great potential for wearable electronics equipped with gas sensing capability in both anaerobic and aerobic environments.
中文翻译：
室温下具有高灵敏度和选择性的基于离子导电水凝胶的可拉伸、自愈和透明 NO2 传感器
本文报道了基于盐渗透水凝胶的可拉伸、自修复和透明气体传感器，用于在厌氧环境和室温空气中进行高性能 NO 2传感。盐渗透水凝胶对 NO 2显示出高灵敏度(119.9%/ppm)、响应和恢复时间短（分别为 29.8 和 41.0 秒）、良好的线性、86 ppt 的低理论检测限 (LOD)、高选择性、稳定性和导电性。提出了一种基于在电极-水凝胶界面发生的氧化还原反应的新气体传感机制来理解传感行为。通过加入氯化钙 (CaCl 2) 通过简单的盐渗透策略在水凝胶中，导致更高的灵敏度 (2.32 倍) 和低得多的 LOD (0.06 倍)。值得注意的是，水凝胶的气体传感能力、导电性和机械变形能力在切断和重新连接后都很容易自愈。像 100% 应变这样的大变形不会剥夺气体传感能力，而是显着缩短了响应和恢复时间。CaCl 2渗透水凝胶对NO 2表现出优异的选择性，对干扰气体具有良好的免疫力。这些结果表明，盐渗透水凝胶对于在厌氧和有氧环境中都具有气体传感能力的可穿戴电子设备具有巨大的潜力。
更新日期：2021-12-29
中文翻译：
室温下具有高灵敏度和选择性的基于离子导电水凝胶的可拉伸、自愈和透明 NO2 传感器
本文报道了基于盐渗透水凝胶的可拉伸、自修复和透明气体传感器，用于在厌氧环境和室温空气中进行高性能 NO 2传感。盐渗透水凝胶对 NO 2显示出高灵敏度(119.9%/ppm)、响应和恢复时间短（分别为 29.8 和 41.0 秒）、良好的线性、86 ppt 的低理论检测限 (LOD)、高选择性、稳定性和导电性。提出了一种基于在电极-水凝胶界面发生的氧化还原反应的新气体传感机制来理解传感行为。通过加入氯化钙 (CaCl 2) 通过简单的盐渗透策略在水凝胶中，导致更高的灵敏度 (2.32 倍) 和低得多的 LOD (0.06 倍)。值得注意的是，水凝胶的气体传感能力、导电性和机械变形能力在切断和重新连接后都很容易自愈。像 100% 应变这样的大变形不会剥夺气体传感能力，而是显着缩短了响应和恢复时间。CaCl 2渗透水凝胶对NO 2表现出优异的选择性，对干扰气体具有良好的免疫力。这些结果表明，盐渗透水凝胶对于在厌氧和有氧环境中都具有气体传感能力的可穿戴电子设备具有巨大的潜力。
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