▎ 摘　　要

NOVELTY - Preparing three-dimensional network graphene-based tensile strain sensor involves: (1) preparing a soft gel precursor by dissolving urea and formaldehyde in water to obtain a mixed solution (A), dissolving vinyl dimethicone, N-isopropylacrylamide and vinylpyrrolidone in a solvent to obtain solutions, mixing and reacting the solutions; (2) preparing graphene with three-dimensional network structure by ultrasonically cleaning foamed nickel with alcohol, acetone and deionized water, drying, then transferring to a chemical vapor deposition device to perform deposition to grown graphene with network structure on the template, etching, and removing the template to get graphene with self-supporting network structure; and (3) heating the precursor and polydimethylsiloxane to get an uncured soft gel, then placing in a transparent glass mold, immersing the self-supporting network graphene in the middle of the gel, drying, solidifying and cooling. USE - The method is useful for preparing three-dimensional network graphene-based tensile strain sensor (claimed). ADVANTAGE - The method enables simple and economical preparation of the three-dimensional network graphene-based tensile strain sensor, and can directly immerse graphene with network structure in polydimethylsiloxane containing temperature-sensitive materials without requiring additional modification of the graphene, thus eliminating tedious modification operations. DETAILED DESCRIPTION - Preparing three-dimensional network graphene-based tensile strain sensor involves: (1) preparing a soft gel precursor by dissolving 1-5 g urea and 5-10 g formaldehyde in 50 ml water to obtain a mixed solution (A), dissolving mixing vinyl dimethicone, N-isopropylacrylamide smf vinylpyrrolidone in a solvent to obtain solutions (B), (C) and (D) with a mass-to-volume concentration of 5-10 g/100 ml, mixing and reacting the solutions (A)-(D) in a volume ratio of 1:2:1:1; (2) preparing graphene with three-dimensional network structure by ultrasonically cleaning foamed nickel with alcohol, acetone and deionized water, and drying with nitrogen as a template for the growth of graphene with network structure, transferring the dried foamed nickel to a chemical vapor deposition device to carry deposition in the presence of methane and hydrogen to grown graphene with network structure on the template, using chemical etching method for etching, and removing the foamed nickel template to get graphene with self-supporting three-dimensional network structure; and (3) heating the soft gel precursor and polydimethylsiloxane to get an uncured soft gel, placing the gel in a transparent glass mold, then immersing the self-supporting network graphene in the middle of the gel, using a transparent glass cover sheet to compact the gel inside the mold, drying and solidifying, and then cooling to room temperature.