On August 11th, Professor Ren Tianling from the Department of Micro-Nano Electronics of Tsinghua University published a graphene paper-based pressure sensor for motion detection at the American Society of Chemistry Nano (ACS Nano) (“Graphene-Paper Pressure†The research papers of Sensor for Detecting Human Motions†have further improved the sensitivity of graphene paper pressure sensors, and this achievement is of great significance for the development of flexible smart wearable sensors.
Flexible mechanical devices have received extensive attention in academia and industry in recent years. Compared to traditional rigid substrate devices, flexible mechanical devices greatly improve the deformability of the device without sacrificing performance, making it suitable for more complex applications, especially for wearable applications. Since its discovery in 2004, graphene materials have been widely used in flexible mechanical devices, thanks to its unique electrical and mechanical properties, and graphene mechanical devices have high sensitivity. However, the existing graphene mechanical sensors face many problems, and have the disadvantages of complicated preparation process, poor repeatability and consistency, and low yield rate, and still have a large distance from practical applications.
Schematic diagram of the structure of graphene paper-based pressure sensor. The device can effectively detect physiological parameters such as pulse and respiration.
Professor Ren Tianling's team innovatively proposed a new method for graphene paper-based pressure sensors, which can convert multi-layer mixed graphene oxide solution and paper material into multi-layer graphene paper by thermal reduction. By using the air passage between the graphene paper layers and the unique microporous structure of the paper material, the graphene paper undergoes a significant change in the resistance under pressure, thereby greatly improving the sensitivity of detecting the pressure. The sensitivity of the pressure sensor can be further improved by selecting the appropriate graphene paper type and the number of layers of the paper. The device enables accurate detection of pulse, respiration and multiple motion states in wearable applications. In addition, this new graphene paper-based device has outstanding advantages such as environmental protection, low cost, and high flexibility.
In recent years, Professor Ren Tianling has devoted himself to researching the limitations of breaking through traditional devices, laying the foundation for a new generation of micro-nano electronic device technology, with particular attention to the basic research and application of graphene sensors, in the field of new graphene acoustic devices and various sensor devices. Received a number of important innovations, such as flexible graphene sounding devices, smart graphene artificial throat, new graphene resistive memory, spectrally adjustable graphene light-emitting devices, graphene biomimetic synapses, and adjustable graphene stress sensors Etc., related results were published in well-known academic journals such as Nature Communications, Advanced Materials, Nano Letters, and ACS Nano. .
Tao Yuqi, a Ph.D. student in the Department of Micro-Nano Electronics, Tsinghua University, is the first author of the article. Professor Ren Tianling and Associate Professor Yang Wei of the Micro-Nano Electronics Department of Tsinghua University are the authors of the paper. The research results were supported by the National Natural Science Foundation's key projects and the Ministry of Science and Technology.
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