Fiber-based humidity sensor based on moisture absorption variable resistor and preparation method of fiber-based humidity sensor

Abstract

The invention provides a fiber-based humidity sensor based on a moisture absorption variable resistor and a preparation method of the fiber-based humidity sensor. The method comprises the following steps: mixing a hydrophilic polymer and water according to a preset mass ratio, then adding a preset amount of a conductive substance and a crosslinking agent, and fully reacting to obtain a spinning solution; carrying out wet spinning on the spinning solution to obtain super-hydrophilic fibers; and processing the obtained super-hydrophilic fiber into a fabric to obtain the fiber-based humidity sensor based on the moisture absorption variable resistance. In this way, the prepared fiber can have electrical conductivity, and the fiber can have good mechanical performance and excellent hydrophilicity at the same time through cross-linking modification of the cross-linking agent. Under external wet stimulation, the super-hydrophilic fiber can generate reversible deformation, so that the arrangement mode of conductive substances in the fiber is changed, the resistance in the fiber is further changed, the humidity sensing function is realized by utilizing the change of an electric signal, and the application requirement of a fiber-based humidity sensor is met.

Description

technical field [0001] The invention relates to the technical field of humidity sensors, in particular to a fiber-based humidity sensor based on a hygroscopic rheostat and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of smart textile technology, flexible smart wearable fabrics have gradually become a research hotspot. Existing flexible wearable fabrics usually use fabrics or flexible films as substrates, and through specific treatment or modification of bulk fabrics or flexible films, they become sensors for a certain signal. However, sensors based on large-area fabrics or flexible films are usually coated with conductive substances on the surface, and the coating layer is easy to fall off and has a limited service life. In addition, the use of large-area flexible materials as substrates can only be used to fabricate or fabricate sensors of the size of the flexible film area, or to obtain the required shape by cutti...

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Problems solved by technology

However, due to the lack of moisture sensitivity of the nanofiber fabric itself provided in this patent, its surface still needs to be coated with a moisture-sensitive material layer, which not only increases the preparation process and cost, but also affects the flexibility of the humidity sensor.

Moreover, the fiber prepared by electrospinning in this patent is relatively thin, and it is not easy to collect in the form of a single fiber or a bundle of fibers. Usually, it is prepared into a nanofiber membrane with irregularly stacked fibers, which is mostly used in the preparation of membrane materials, and is difficult to collect. The preparation of fibers with special-shaped or skin-core structures requires high equipment requirements, resulting in limited application range

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