Preparation method of graphene-based surface strain sensor
A strain sensor, graphene-based technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problems of difficult to prepare area thin film, unable to meet health detection, complicated preparation process, etc., to achieve low price, manufacturing The effect of low cost and simple operation
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[0035] Example 1
[0036] 50 ml of 1 mg / ml graphene oxide solution was taken, and 250 ml of ethanol was added thereto. Stably dispersed graphene oxide dispersions were prepared in water / ethanol solution. Sonicate for a while, take 6ml of the homogeneous solution and add it to the airbrush spray bottle. The polytetrafluoroethylene plate was washed, then dried, and put on a heating table to raise the temperature to 100°C. At this time, the above solution was sprayed on a polytetrafluoroethylene plate with an area of 2×10 cm using an airbrush connected with an air pump, and the spraying distance was about 5 cm. Graphene oxide films (such as Figure 1 to Figure 4 shown), and then use HI acid to reduce the film to form a graphene film, connect two copper electrodes with conductive glue at both ends of the graphene film, and connect an ohmmeter between the two electrodes; then on the graphene film Continue to spray a layer of styrene-acrylic emulsion to form a polymer emulsion...
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[0037] Example 2
[0038] Using ethanol solution as dispersion medium, a 0.2 mg / ml graphene oxide solution was prepared. Sonicate for a while, take 6ml of the homogeneous solution and add it to the airbrush spray bottle. The silica gel substrate was cleaned and then dried. At this time, the above-mentioned solution was sprayed on a silica gel substrate with an area of 2×10 cm using an airbrush connected with an air pump, and the spraying distance was about 5 cm. A graphene oxide film was prepared, and then HI acid was used to reduce the film to form a graphene film. At both ends of the graphene film, two copper electrodes were connected with conductive glue, and an ohmmeter was connected between the two electrodes; then a layer of Styrene acrylic emulsion. The sensing performance was tested after the emulsion film was dried.
[0039] Among them, the sensitivity index Gauge factor (GF) is about 5 (GF=(R-R 0 ) / R 0 ε, where R represents the resistance before deformation, ...
Example Embodiment
[0040] Example 3
[0041]Using ethanol solution as dispersion medium, a 0.2 mg / ml graphene oxide solution was prepared. Add carbon nanotubes to it, make graphene oxide: the mass ratio of carbon nanotubes is 5: 1, after ultrasonic 30min, get 6ml of this solution, add the titanium dioxide solution (particle diameter: 5nm, sharp) of 0.5mg / ml to it. titanium ore) 2ml. At this time, the above solution was sprayed on a polytetrafluoroethylene plate with an area of 2×10 cm using an airbrush connected with an air pump, and the spraying distance was about 5 cm. Graphene oxide films / carbon nanotubes / titania composite films (e.g. Image 6 , Figure 7 shown). Irradiate under ultraviolet light for 10h, (wherein the ultraviolet lamp is 175W, and the distance between the sample and the lamp tube is 15cm) for reduction to form a graphene film. At both ends of the graphene film, two copper electrodes are connected with conductive glue. Connect an ohmmeter between the electrodes; then sp...
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