Introduction: Graphene ultra high electron mobility and superior mechanical toughness of the very promising in the field of solar cell, a heatsink, flexible electronic devices and the like. In view of single-layer or fewer-layer graphene not been widely implemented, graphene-based material with its functional film exhibits excellent electrical conductivity in the macro state, such as bending and thermal conductivity characteristics, a new generation of flexible high conductivity film material.
Introduction
Graphene has a particularly high electron mobility and superior mechanical toughness of the very promising in the field of solar cell, a heatsink, flexible electronic devices and the like. In view of single-layer or fewer-layer graphene not been widely implemented, graphene-based material with its functional film exhibits excellent electrical conductivity in the macro state, such as bending and thermal conductivity characteristics, a new generation of flexible high conductivity film material. Generally speaking, a graphene thin film material is a one-dimensional monolayer or a few layers of graphene nanosheet, carbon nanotube, a two-dimensional carbon material by spin coating, suction, pressing and even ink jet printing, preparing a 3D printing process from a three-dimensional material, and then cured using a high temperature film forming process. Thus obtained film thickness of the flexible conductive graphene typically micron, comprising tens of thousands of graphene layers. Although this loss of light transmissive film graphene, but in close alignment between the graphene layer to give a very excellent electrical properties, the electrical conductivity can be achieved compared with the intended metal.
About the results
Recently, research centers RF and microwave Wuhan University of 30mm thickness using a He Taiping TF, high conductivity 106S / m graphene multilayer films, designed a new environmentally friendly, low cost paper-based flexible pressure sensor antenna. The sensor showed good radiation performance and a strong stress-induced characteristics, by comparison with the antenna metallic copper, having a graphene thin film flexible antenna higher sensitivity and more excellent stability. In addition, graphene thin film pressure sensor further having a flexible antenna flexible mechanical properties, reversible deformability and an excellent temperature resistance.
(A-c) TEM, XRD and SEM cross-sectional view illustrations, respectively graphene oxide solution Raman spectra.
(D) the graphene paper base antenna affixed to the back of the hand pressure sensor
(E) a normalized state with the movement of the resonance frequency curve
(F) PET substrate pressure sensor graphene antenna affixed to the elbow
In practical applications, depending on the test environment, select a different substrate materials also can complete the pressure sensing function. Since the ratio of paper-based PET substrate and considerate person degree higher, the base paper in FIG antenna exhibits a more excellent offset properties.
Small knot
This work proposes a graphene thin film to be introduced into the flexible antenna sensor applications, to achieve a high sensitivity, high stability of the pressure sensor, may be very suitable for the field of wearable wireless strain sensing devices and the like. This work provides a new idea for the study of electronic devices based on graphene, while providing a novel functionalized graphene material to further enhance the performance of the antenna and various sensors.
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