Mxene@chitosan@polyurethane foam three-dimensional composite material, and preparation method and application thereof

Abstract

The invention relates to a Mxene@chitosan@polyurethane foam three-dimensional composite material and a high-sensitivity and high-reliability piezoresistive sensor constructed by using the material, and preparation methods thereof. The structure control of a conductive network and micro-cracks in the sensor and introduction of the structure system of Mxene@chitosan make a polyurethane skeleton firmly and closely coated with a conductive filler, so the stability of long-term recycling is greatly improved; and Mxene nanosheets have a small size, and the number of the micro-cracks produced by thepolyurethane-coated skeleton is high, and the detection under small strain is accurate. The Mxene@CS@PU composite three-dimensional structure with good stress strain can be obtained by optimizing theimpregnation frequency (1 to 5, and preferably 2) of a conductive filler in the preparation process of the sensor and the treatment steps of a technology of centrifugal removal of the Mxene nansheetsnot completely coating the skeleton and the drying temperature in the preparation process.

Description

technical field [0001] The invention belongs to the field of flexible and wearable electronics and new material technology, and specifically relates to a novel composite piezoresistive polyurethane foam, a preparation method thereof, and a piezoresistive sensor assembled using the composite polyurethane foam. Background technique [0002] The two-dimensional sheet-like nanomaterial Mxene-transition metal carbide is a new type of conductive material, which was jointly discovered by Professor Yuri Gao Guoqi and his colleagues from Drexel University in the United States in 2011. Mxene is obtained by etching the MAX phase of its precursor material. Among them, M is a transition group metal, A is mainly a group III or IV element, and X is a C or N element. Since Mxene has a two-dimensional sheet structure similar to graphene, and has the characteristics of large specific surface area, many active sites, and atomic layer thickness, it also has the advantages of good hydrophilicit...

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Problems solved by technology

At present, the research on using polyurethane foam as the sensor skeleton (documents 1, 2, 3) and the research on using Mxene as a conductive filler (documents 4, 5) has cumbersome preparation methods, high cost, and limited application, and the prepared The use of sensors is limited and it is difficult to achieve mass production

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