▎ 摘　　要

NOVELTY - Preparing variable gradient structure flexible gas gel, comprises (i) pouring the gas gel collagen liquid into mold for freezing and drying to obtain polymer-nanomaterial gas gel layer in which component of gas gel collagen liquid includes polymer matrix, two-dimensional nanomaterial and organic solvent, (ii) repeating the step (i), repeating the times ≥1 times to obtain multilayer integrated polymer-nanomaterial gas gel, content of polymer matrix and/or two-dimensional nanomaterial in gas gel collagen liquid for preparing each layer of gas gel is different, (iii) performing first annealing to multilayer integrated polymer-nanomaterial gas gel to obtain variable gradient flexible three-dimensional piezoelectric framework and (iv) ultrasonically dipping the variable gradient flexible three-dimensional piezoelectric framework in two-dimensional conductive material solution, performing the second annealing and drying to obtain final product. USE - The variable gradient structure flexible gas gel is useful for flexible pressure sensors (claimed). ADVANTAGE - The variable gradient structure flexible gas gel utilizes flexible pressure sensors has high sensitivity, achieves gradient-sensitive detection for external stimuli of different pressures, simple fabrication process, convenient operation, light quality, no toxic substance, low production cost and provides a technical basis for manufacturing wear-resistant sensing device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for flexible pressure sensor, comprising lower packaging layer, lower electrode layer, variable gradient structure flexible gas gel, upper electrode layer and an upper packaging layer in which lower electrode layer and upper electrode layer are connected with lead and lead is connected with electric signal measuring device.