Graphene with ultra-high electron mobility and super mechanical toughness has great development prospects in the fields of solar cells, heat sinks, and flexible electronic devices. In view of the fact that single-layer or minority-layer graphene has not been widely used, graphene-based thin film functional materials have become a new generation of flexible high conductivity due to their excellent electrical conductivity, thermal conductivity and bendability under macroscopic conditions. Film material. Generally speaking, the graphene film material is prepared by one-dimensional or two-dimensional carbon nanotubes such as single layer or a few layers of graphene nanosheets, carbon nanotubes, etc. by spin coating, suction filtration, pressing, or even inkjet printing, 3D printing, and the like. The three-dimensional material is formed into a film by high temperature curing. The graphene flexible conductive film thus obtained has a thickness of usually on the order of micrometers and contains tens of thousands of layers of graphene. Although this film loses the light transmittance of graphene, it has excellent electrical conductivity through the close alignment between the graphene layers, and its electrical conductivity can be compared with that of metal.
Summary of resultsRecently, Prof. He Daping, Professor of Radio Frequency and Microwave Research Center of Wuhan University of Technology, designed a new environmentally friendly, low-cost paper-based flexible antenna pressure sensor using a multilayer graphene film with a thickness of 30 mm and a conductivity of up to 106 S/m. The sensor exhibits better radiation performance and stronger stress-sensing characteristics. Compared with the metal copper antenna, the graphene film flexible antenna has higher sensitivity and better stability. In addition, the graphene film flexible antenna pressure sensor also has flexible mechanical properties, reversible deformation and excellent temperature resistance.
Graphic guide
figure 1. Characterization of graphene film and its application to antenna sensor performance
(a-c) TEM, XRD and cross-sectional SEM images, the illustrations are graphene oxide solution and Raman spectrum, respectively.
(d) Paper-based graphene antenna pressure sensor attached to the back of the hand
(e) Normalized resonant frequency as a function of motion state
(f) PET-based graphene antenna pressure sensor attached to the elbow
In practical applications, depending on the test environment, the choice of different substrate materials can also perform the function of pressure sensing. Since the paper base has a higher degree of fit to the human body than the PET base, the paper-based antenna in the figure exhibits a more excellent frequency offset performance.
summaryThis work proposes an application to introduce a graphene film into a flexible antenna sensor, and realizes high sensitivity and high stability pressure sensing, which is very suitable for applications such as wearable devices and wireless strain sensing. This work provides a new idea for the study of graphene-based electronic devices, while providing a new functionalized graphene material to further enhance the performance of various sensors and antennas.
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