Zhang Kaili, Jiang Wenshuai, Li Xiaokuan, Gao Xiaoguang
Shanxi Bethune Hospital, Shanxi Academy of medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, People's Republic of China.
Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.
Nanotechnology. 2022 Nov 25;34(6). doi: 10.1088/1361-6528/aca1ca.
High-performance strain sensors have received extensive attention due to their wide range of applications in pulsebeat detection, speech recognition, motion detection, and blood pressure monitoring. However, it is difficult to simultaneously attain high sensitivity and excellent stretchability. In this work, a strain sensor based on modified polydimethylsiloxane (PDMS) and conductive hybrid particles of silver nanowires (AgNWs)/graphene was successfully fabricated. A facile solvothermal polymerization process was used to change the structure of cross-linking networks and to obtain the PDMS elastomer with excellent stretchability. The application of the modified PDMS endows the strain sensor with a large strain range (∼20%), which is 100% higher than that of the strain sensor with unmodified PDMS. The AgNWs/graphene hybrid particles were prepared by a simple coprecipitation, reduction, and drying method. AgNWs serve as bridges between graphene sheets, endowing the strain sensor with a large gauge factor (GF = 400). The stability of the strain sensor was also verified. Besides, the strain sensor was successfully used in fields such as finger bending and speech recognition. Considering its high sensitivity, excellent stretchability, and high working stability, the sensor has great potential in health monitoring and motion detection.
高性能应变传感器因其在脉搏检测、语音识别、运动检测和血压监测等广泛应用中受到了广泛关注。然而，要同时实现高灵敏度和出色的拉伸性却很困难。在这项工作中，成功制备了一种基于改性聚二甲基硅氧烷（PDMS）和银纳米线（AgNWs）/石墨烯导电混合颗粒的应变传感器。采用简便的溶剂热聚合工艺改变交联网络结构，获得具有出色拉伸性的PDMS弹性体。改性PDMS的应用使应变传感器具有较大的应变范围（约20%），比未改性PDMS的应变传感器高出100%。通过简单的共沉淀、还原和干燥方法制备了AgNWs/石墨烯混合颗粒。AgNWs作为石墨烯片层之间的桥梁，赋予应变传感器较大的应变系数（GF = 400）。该应变传感器的稳定性也得到了验证。此外，该应变传感器已成功应用于手指弯曲和语音识别等领域。鉴于其高灵敏度、出色的拉伸性和高工作稳定性，该传感器在健康监测和运动检测方面具有巨大潜力。
