Flexible sensor and its preparation method

Abstract

The invention discloses a flexible sensor and a preparation method thereof. The flexible sensor is featured in that the protonic acid doping peak in the infrared Fourier spectra of a protonic-acid-doped polyaniline sheet is 1240cm<-1>, two ends of the protonic-acid-doped polyaniline sheet are provided with electrodes, and the protonic-acid-doped polyaniline sheet is coated with a flexible insulating material. The method comprises steps of firstly uniformly mixing aniline and protonic acid to obtain a transparent solution, placing an anode and a graphite cathode in the transparent mixed solution for electrodeposition to obtain protonic-acid-doped polyaniline coating on the anode, then dying the protonic-acid-doped polyaniline, arranging electrodes at two ends of the protonic-acid-doped polyaniline to obtain electrode-contained protonic-acid-doped polyaniline coating on the anode, separating the electrode-contained protonic-acid-doped polyaniline from the anode, coating the flexible insulating material on the surface of the protonic-acid-doped polyaniline provided with the electrodes at two ends, and dying the coated protonic-acid-doped polyaniline to obtain a target product. The flexible sensor has a high resistance change rate in stretching, can be widely used in working conditions of folding, distorting, stretching and the like, and is particularly suitable for the field of wearable equipment.

Description

technical field [0001] The invention relates to a sensor and a preparation method, in particular to a flexible sensor and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, sensors have been widely used in biomedical testing, intelligent robots, flexible displays, wearable devices and other fields. Sensors in these fields often need to work under high strain or extreme conditions such as folding, twisting, stretching, etc., which requires the sensor not only to have good strain-resistance characteristics, but also to have excellent flexibility. To this end, people have made various unremitting efforts, such as the Chinese invention patent application CN 105603761A published on May 25, 2016, which discloses a moisture-sensitive stretchable polyaniline conductive fiber and its preparation method. The conductive fiber mentioned in the patent application for this invention includes a template fiber and a protonic ac...

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Problems solved by technology

Although this product has excellent tensile bending properties and humidity sensitivity, there are deficiencies in its preparation method. First, the initial resistance of the product is too large, up to 50 megohms, which greatly increases the difficulty of testing, thus It makes it difficult for practical application; secondly, the resistance change rate of the product after stretching is too small. When the stretching amount is 50%, 100%, 150% and 200% respectively, the change rate of resistance is only 0.02, 0.036 , 0.048 and 0.066, such a small resistance change rate makes it difficult to be used in flexible sensors; again, the preparation method is not only easy to introduce other impurities, but also more complicated, and it is impossible to obtain a product with a high resistance change rate after stretching

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