Temperature-adaptable pressure sensors based on MXene-coated GO hierarchical aerogels with superb detection capability
Temperature-adaptable pressure sensors based on MXene-coated GO hierarchical aerogels with superb detection capability
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DOI：
10.1016/j.carbon.2022.08.002
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发表时间：
2022-08-24
期刊：
影响因子：
10.9
通讯作者：
Wang, Jinqing
中科院分区：
文献类型：
--
作者：
Chen, Tiandi;Yang, Gaochuang;Wang, Jinqing
随着智能传感器在各种复杂条件下的广泛应用，对传感材料的力学性能、导电性能以及温度适应性提出了更高的要求。为此，设计并通过两步策略（包括自组装和真空辅助浸涂工艺）制备GO/PVA/MXene（GPM）复合气凝胶。所制备的GPM具有由分级GO网络骨架和MXene涂层组成的独特结构，赋予其高杨氏模量（11.2kPa）和压缩性（90%）。有限元模拟结果表明，GPM的弹性和韧性来源于分层的微观结构和壳层厚度的提高。此外，GPM具有50%应变下5,000次压缩循环的长期耐久性、1.744 kPa（-1）的高灵敏度和4.5 ms的快速响应时间。进一步的应用实例表明，基于GPM的压力传感器具有优越的上级生理信号捕获能力，实现了指尖脉搏和颞动脉检测。此外，GPM气凝胶还具有很高的隔热效率，在-196 ℃以下的恶劣环境中具有良好的温度适应能力。C到300？C.高灵敏度的压力传感器在智能工厂、复杂军事、空间探索等领域具有潜在的应用价值。
With the broader application of intelligent sensors in various complex conditions, sensing materials with better mechanical and conductive properties as well as higher temperature adaptability are required. For this purpose, a GO/PVA/MXene (GPM) composite aerogel was designed and prepared via a two-step strategy, including self -assembly and vacuum-assisted dip-coating processes. The as-prepared GPM has a unique structure composed of hierarchical GO network skeleton and MXene coating, endowing it with high Young's modulus (11.2 kPa) and compressibility (90%). Demonstrated with the finite element (FE) simulation, the elasticity and toughness of the GPM are originated from the hierarchical microstructure and the improved thickness of shells. Besides, the GPM exhibits a long-term durability of 5,000 compression cycles at 50% strain, a high sensitivity of 1.744 kPa(-1), and a rapid response time of 4.5 ms. Further application examples reveal that the pressure sensor based on GPM has superior physiological signal capture capability, realizing fingertip pulse and temporal artery detections. Moreover, the GPM aerogel possesses high thermal insulation efficiency, resulting in good temperature adapt-ability in harsh environments from-196 ?C to 300 ?C. The sensitive pressure sensors should have the potential application in many fields of intelligent factories, complex militaries, and space discoveries.