Professor Ren Tianring, a professor of microelectronics at Tsinghua University, published an article titled “High Sensitivity and Wide Linear Range Graphene Pressure Sensor with Bionic Randomly Distributed Structure” at ACS Nano, Sensor with Random Distributed Spinosum for High Sensitivity and Large Linearity. The similar biomimetic structures are proposed based on human skin-sensing microstructures. The combination of microstructure and distribution mode solves the contradiction between sensitivity and linear range. The comprehensive improvement of device performance provides a new idea. dan202ut106
In recent years, the flexible force micro-nano sensor has become a research hot spot in the field of human physiological information monitoring and detection in particular, and a large number of related industry companies have been established one after another. Compared with the traditional silicon-based devices, due to its comfort, fit and wearability and other aspects of the characteristics of the widely used in physical and chemical monitoring of the human body, but as a mechanical device, two important indicators of sensitivity and linearity The contradiction between has not been well resolved. The devices that are usually prepared need to sacrifice one index to serve the other one, which often limits the scope of its practical application. Solving the contradiction becomes a difficult problem.
Based on the highly sensitive response of human skin, especially the fingertips to different sizes of stresses, Ninteen’s group proposed the preparation of a similar structure based on the study of its microstructure. The sandpaper was used as a template to form a flexible substrate. The graphene was used as a mechanosensitive layer after being reduced at high temperature to prepare a pressure sensor with acupuncture morphology and random distribution. The sensor exhibits excellent stability, fast response and low detection limits, enabling high sensitivity over a wider linear measurement range. Among them, the acupunctural changes in the contact area mainly contribute to the high sensitivity, and the random distribution mainly contributes to the wide linear range. The combination of the two largely resolves this contradiction. lm2678t-adj
Due to the high sensitivity and wide linear range of the sensor, the research group successfully applied to the monitoring of various physiological activities of the human body, such as pulse, respiration and voice recognition, as well as the monitoring of walking posture such as walking, running and jumping, As well as walking gait monitoring. The use of wearable high-performance mechanical sensors to acquire various physical activity parameters of the human body will have important practical significance in terms of personal health and medical treatment, and has great application prospects.
The research results have been supported by the National Natural Science Foundation of China and Ministry of Science and Technology projects.
