Strain sensor with high sensitivity and large strain response and preparation method thereof
A strain sensor and sensor technology, applied in the field of strain sensors, can solve the problems of restricting the widespread promotion and application of materials, high stretchability, low sensitivity, etc., and achieve a large strain sensing range, low production cost, and simple and convenient operation. Effect
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[0052] Example one:
[0053] In this embodiment, polyurethane fiber is used as the matrix, carbon nanotube ink is used as the conductive coating, the fiber is swelled in DMF, and then the conductive ink is uniformly distributed on the surface of the fiber during the ultrasonic process to make a strain sensor. Finally, the strain sensor is manufactured in the electronic universal testing machine. The strain sensor with crack-fold microstructure is prepared by applying stress; the specific process is:
[0054] (1) Cut the polyurethane fiber into a length of 4cm, and wash it with absolute ethanol and deionized water in an ultrasonic cleaner for 10 minutes to remove surface impurities; the size of the polyurethane fiber used is 2500D and the diameter is 500μm;
[0055] (2) Put the polyurethane fibers cleaned in step (1) into the DMF solution, swell for 1 hour, and then put the swollen polyurethane fibers into the carbon nanotube ink dispersion in turn, and the carbon nanotube ink complet...
Example Embodiment
[0058] Example two
[0059] The first three steps of the preparation method are the same as in Example 1. When constructing the crack-fold microstructure in the fourth step, apply 50% strain at a rate of 2mm / min, and then return to the initial position at the same rate; The two ends of the polyurethane fiber covered with carbon nanotube coating are connected with copper tape as electrodes to obtain a strain sensor with microstructure.
Example Embodiment
[0060] Example three
[0061] The first three steps of the preparation method are the same as in Example 1. When constructing the crack-fold microstructure in the fourth step, a strain of 70% is applied at a rate of 2mm / min, and then it returns to the original position at the same rate; The two ends of the polyurethane fiber covered with carbon nanotube coating are connected with copper tape as electrodes to obtain a strain sensor with microstructure.
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