Carbon/graphene flexibility strain sensor and preparation method thereof

Abstract

The invention relates to a carbon / graphene flexibility strain sensor and a preparation method thereof. The preparation method comprises the steps of firstly preoxidizing and carbonizing polyacrylonitrile / graphene composite nanometer fiber yarns to obtain carbon / graphene composite nanometer fiber yarns; and then compounding the carbon / graphene composite nanometer fiber yarns with an elastic film prepared from thermoplastics polymer, a lead and a conductive adhesive to obtain the carbon / graphene flexibility strain sensor. The preparation method is reasonable in preparation process; the sensor issteady in performance in the preparation process and the dimension of the sensor can be adjusted based on demands; the sensitivity coefficient of the obtain carbon / graphene flexibility strain sensoris 400-2500 when the sensitivity coefficient is A; and when the circular stretching is carried out in the presence of the elongation from 0 to A, the total test time is 2000s and the cycle index is 28, the standard deviation of the sensitivity coefficient is 0.5% to 4%; and A is equal to 1.5% t 2.3%.

Description

technical field [0001] The invention belongs to the field of sensors, and relates to a carbon / graphene flexible strain sensor and a preparation method thereof. Background technique [0002] As an important branch of nanomaterials, carbon nanomaterials are widely used in aerospace, transportation, medical, machinery, Textile and sporting goods and other fields. At the same time, in order to meet the current demand for smart sensors, the application of carbon nanomaterials in sensors is also advancing rapidly, and flexible composite sensors with carbon nanofibers as the main material have attracted more and more attention. [0003] Patent CN102353324A prepares a zinc oxide nanowire / poly A flexible translucent strain sensor with a styrene nanofiber hybrid structure; patent CN103225204A is provided with a barrier layer of metal material on the surface of the flexible fabric, and printed graphite, flexible epoxy resin or fully transparent is arranged between the barrier layer a...

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Problems solved by technology

However, many researchers combine graphene or carbon fibers with polymers to prepare high-performance strain sensors. The preparation process is relatively complicated, and the preparation process of the sensor is unstable. The prepared sensors often cannot achieve high stability and high sensitivity at the same time.

For example, Wang et al. (Wang, Z.F, Huang Y., Sun J.F, et al.Polyurethane / Cotton / Carbon nanotubescore-spun yarn as high reliability stretchable strain sensor for human motion detection[J].ACS Applied Materials&Interfaces,2016,8(37 ): 24837-24843.) Coating carbon nanotubes onto cotton / polyurethane yarns to design sensors, the tensile strain reached 300%, but its sensitivity coefficient was only 0.65; Zhang et al. (Zhang R, Deng H., Valenca R, et al.Carbon nanotube polymercoatings for textile yarns with good strain sensing capability[J].Sensors and Actuators A:Physical,2012,179:83-91.) Using carbon nanotube / polyurethane mixed solution coating to polyurethane yarn The sensor is designed above, which can withstand 30% strain, but its sensitivity coefficient is less than 10, and its stability is low, such as figure 1 Shown; Li et al. (Li X.T., Hua T, Xu B.Electromechanical properties of a yarnstrain sensor with graphene-sheath / polyurethane-core[J].Carbon,2017,118:686-698.) using graphene coating To the surface of polyurethane yarn containing polyvinyl alcohol, the strain can reach 50%, but the maximum sensitivity coefficient is 96.04; Li et al. (Li Y.B., Shang Y.Y., He X.D., et al. as strain sensors and rotational actuators[J].ACS nano,2013,7(9):8128-8135.) Directly use carbon nanotube yarns to design sensors, and its sensitivity coefficient is less than 100

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