Elastic strain sensor and preparation method thereof

Abstract

The invention provides an elastic strain sensor and a preparation method thereof. The preparation method comprises the steps of M1 etching an MAX phase material to obtain an MXene material; M2 adding a conductive material into the MXene material to obtain an MXene composite material; M3 modifying a supporting material with the MXene composite material to form a sensitive layer of the strain sensor; M4 coating an elastic electrode supporting layer on a substrate, and patterning the elastic electrode supporting layer; M5 preparing an electrode conducting layer on the elastic electrode supporting layer by using a stripping process; M6 removing the substrate to obtain an elastic electrode; M7 casting an elastic polymer to prepare an elastic substrate, and transferring the elastic electrode to the elastic substrate; and M8 placing the sensitive layer of the strain sensor on the elastic electrode. The sensor provided by the invention adopts a structure of modifying the MXene composite material on the supporting material to measure the strain, so that the sensitivity and the stretching range of the sensor are improved, and the service life of the sensor is prolonged.

Description

technical field [0001] The invention relates to the field of flexible wearable sensors, in particular to an elastic strain sensor and a preparation method thereof, which are applicable to fields such as wearable devices, medical rehabilitation training, and human-computer interaction. Background technique [0002] With the rise of flexible electronics and the development of human health medicine, the application of elastic sensors in wearable devices has attracted much attention because of their portability, real-time performance and reliability. Among them, wearable elastic strain sensors have great application potential in the fields of medical diagnosis, sports rehabilitation, virtual reality, robot manipulation, sports training, and entertainment. [0003] Compared with traditional copper foil strain gauges, elastic strain sensors have made great progress, but there is still a long way to go before they are practical. By searching the existing elastic strain sensor main...

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Problems solved by technology

The sensor has high sensitivity, but the stretching range is only 15%, which is difficult to meet the requirements of the test on the surface strain of human skin

Huang et al. proposed a strain sensor in Composites Science and Technology, 2020. The sensor is prepared by mixing carbon nanotubes and polydimethylsiloxane solution and then cured by laser ablation. The sensor preparation process is simple and cost-effective Low performance is easy to adjust, but there is still the problem that the stretch range is too small

Chen et al. proposed in ACS Applied Materials & Interfaces, 2020, 12, 22200-22211 to prepare sensors by using Ecoflex to make wave-shaped microchannels and inject eutectic gallium indium liquid metal. The sensor has good stretchability but has low sensitivity, The problem of easy leakage of liquid metal

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