Su Yuanjie, Liu Yulin, Li Weixiong, Xiao Xiao, Chen Chunxu, Lu Haijun, Yuan Zhen, Tai Huiling, Jiang Yadong, Zou Jie, Xie Guangzhong, Chen Jun
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.
Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Mater Horiz. 2023 Mar 6;10(3):842-851. doi: 10.1039/d2mh01466a.
The performance of chemical sensors is dominated by the perception of the target molecules sensitive materials and the conduction of sensing signals through transducers. However, sensing and transduction are spatially and temporally independent in most chemical sensors, which poses a challenge for device miniaturization and integration. Herein, we proposed a sensing-transducing coupled strategy by embedding the high piezoresponse Sm-PMN-PT ceramic ( = ∼1500 pC N) into a moisture-sensitive polyetherimide (PEI) polymer matrix electrospinning to conjugate the humidity perception and signal transduction synchronously and sympatrically. Through phase-field simulation and experimental characterization, we reveal the principle of design of the composition and topological structure of sensing-transducing coupled piezoelectric (STP) textiles in order to modulate the recognition, conversion, and sensitive component utilization ratio of the prepared active humidity sensors, achieving high sensitivity (0.9%/RH%) and fast response (20 s) toward ambient moisture. The prepared STP textile can be worn on the human body to realize emotion recognition, exercise status monitoring, and physiological stress identification. This work offers unprecedented insights into the coupling mechanism between chemisorption-related interfacial state and energy conversion efficiency and opens up a new paradigm for developing autonomous, multifunctional and highly sensitive flexible chemical sensors.
化学传感器的性能主要取决于敏感材料对目标分子的感知以及传感信号通过换能器的传导。然而，在大多数化学传感器中，传感和转换在空间和时间上是独立的，这对器件的小型化和集成提出了挑战。在此，我们提出了一种传感-转换耦合策略，即将具有高压电响应的Sm-PMN-PT陶瓷（= ∼1500 pC N）通过静电纺丝嵌入到对湿度敏感的聚醚酰亚胺（PEI）聚合物基体中，以实现湿度感知和信号转换的同步和同域共轭。通过相场模拟和实验表征，我们揭示了传感-转换耦合压电（STP）纺织品的组成和拓扑结构的设计原理，以便调节所制备的有源湿度传感器的识别、转换和敏感元件利用率，实现对环境湿度的高灵敏度（0.9%/RH%）和快速响应（20 s）。所制备的STP纺织品可穿戴在人体上，以实现情绪识别、运动状态监测和生理压力识别。这项工作为化学吸附相关界面状态与能量转换效率之间的耦合机制提供了前所未有的见解，并为开发自主、多功能和高灵敏度的柔性化学传感器开辟了新的范例。
