智能时代下的新型柔性压阻传感器

Sensor is an important device to convert external physical excitation into electrical signals. With the development of Internet of Things, biomedical, artificial intelligence, the requirements of sensor properties are getting stringent. Researchers are constantly developing novel sensors to meet the growing demand. Recently, researchers have actively carried out relevant work on flexible sensors with new materials, new structures and high performance. The technologies such as material selection, structure control and preparation process are continuously deve-loped. The sensing principle of the flexible resistive sensor is to convert the applied pressure signals into electrical signals. The flexible resistive sensor with excellent performance has high sensitivity, high linearity, large working range, fast response and repeatability. The microstructure of the sensor is the main regulator of the property. The traditional sensor characterization method can only measure the structure of the device statically, but it cannot dynamically monitor the change of material structure and chemical composition which influence the electronic property under the working condition in real time. The emergence of in situ characterization technology can solve the problems above and provide intuitive experimental support for improving sensor property. At the same time, a simple sensor cannot meet the technical needs in the age of information. It is no doubt that intelligent integrated and arrayed system is the trend of future sensor technology development. The intelligent sensing system possesses the function of collecting signals by the flexible resistive sensor and connecting the sensor with the designed integrated circuit. After transmitting and processing, the data is processed by artificial intelligence neural network algorithm. The results are transmitted to the intelligent display terminals where users can check the information and data analysis result. In this review, we place particular emphasis on the progress of intelligent flexible resistive sensors. The microstructure and property research in sensors using the in situ characterization technique is clarified. Additionally, how to construct the intelligent sensing system based on flexible resistive sensor is also illustrated. Finally, we summarize recent development trends and application forecasts, especially the challenges in combination with intelligent system.