Domestic researchers successfully developed large-scale, high-precision flow and temperature sensors based on graphite thin materials, and are expected to be applied on a large scale in thermal systems.
Recently, Prof. Zhu Hongwei from Tsinghua University and Beijing Huada Biotech Electronic Systems Co., Ltd. jointly developed graphene temperature and flow integration sensor devices. In view of the application of thermal system detection flow rate and temperature sensor, through the research on the function and law of graphene sensing, they break through the key technologies of graphene material application in the heat meter and develop the thermal system to detect the graphene flow rate, temperature The sensor device solves the problems of scaling and high power consumption on the surface of the existing sensor and forms a batch preparation capability which is expected to be applied on a large scale in a thermal system.
The team completed the research on the modulation properties of graphene wafers in terms of shape, size and surface / interface state. Through the structural design of the sensing process based on graphite thin materials, a large-scale, high-precision flow and temperature sensor was developed. Flow sensor components measuring range of 0.01 ~ 6m3 / h, measurement accuracy of 0.005m3 / h; temperature sensor components measuring range of 0 ~ 100 ℃, the measurement accuracy of 0.02 ℃.
On the basis of graphene flow rate and temperature sensing materials, two expansion studies are carried out at the same time: 1) A new idea of ​​high sensitivity and flexible strain sensing is proposed. By graphene and superelastic ultrathin polymer materials A kind of sensor based on flexible sensor was developed. The manufacturing method and technology of sensor for wearable equipment were developed. Some typical sensing applications such as strain, piezoresistive, torsion, volatile organic compounds and acoustic wave were explored. Detection of weak physiological signals such as pulse and voice, which are expected to be applied to mobile medical devices and wearable devices. 2) The diffusion of water in the pores of graphene sheets has been studied. An isotope labeling method has been developed to reveal water molecules The diffusion coefficient in graphene is 4 to 5 orders of magnitude higher than the diffusion coefficient of micron-sized channels in the microporous membrane, which proves that the water molecules can be transported ultra-fast, which lays the foundation for the research on mass transfer properties based on graphene. The field of rapid filtration and separation show a broad application prospects.
Related R & D Achievements SCI has published 15 papers, applied for 5 national invention patents and obtained 1 utility model patent. Six sensors were prepared by ACSNano, Adv. Funct. Mater. Small, NanoRes. , Appl. Phys. Lett. Chem. Commun. And other academic media Nanowerk, Graphene-Info and MaterialsViewsWiley as research highlights, was evaluated as "a new sensing mechanism, high-performance applications of graphene?", "The electromechanical effect of graphene combined with other characteristics ? Promote the application of highly sensitive sensing? The potential uses of these sensors include flexible display, smart clothing, electronic skin, in vitro diagnosis, etc., in the wearable health testing equipment has a larger application space.
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