▎ 摘　　要

NOVELTY - Insulation-conductivity cycle conversion rubber/nanocarbon material/low melting point alloy composite thin film device has three-layer doped vulcanized rubber material, where the outer two layers are nano-carbon layers, and the middle is a low-melting-point alloy layer doped with nano-carbon materials. The three-layer doped vulcanized rubber material is formed by attaching the low-melting-point alloy layers of two films to each other, when preparing the film adding the mixture formed by banburying rubber and low melting point alloy to the dispersion formed by nano carbon material, surfactant and organic solvent, after adding the crosslinking agent and the auxiliary crosslinking agent, mixing, drying the mixed dispersion at normal temperature, where the low melting point gold settles to the bottom of the film and drying to form a film and the low melting point alloy is tin-bismuth alloy or tin-bismuth-indium alloy. USE - The thin film used as a varistor switch and flexible sensor. ADVANTAGE - The thin film device has simple preparation process, excellent mechanical properties, realizes insulation and conduction cyclic conversion, achieves the resistivity change range can reach 11 orders of magnitude, and has excellent medium resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the rubber/nanocarbon material/low melting point alloy composite thin film device of insulation-conduction conversion of insulation-conduction cycle conversion involving (i) mixing the nano-carbon material, surfactant and solvent, stirring with a magnetic stirrer, and ultrasonically dispersing to obtain a nano-carbon material dispersion, (ii) placing the rubber and low melting point alloy into the internal mixer for banburying to refine the low melting point alloy, taking it out of the rubber/alloy mixture, and cooling , (iii) dissolving the rubber/alloy mixture in the nano carbon material dispersion, adding the cross-linking agent and the cross-linking additive, and stirring to obtain a uniform mixed dispersion, (iv) pouring the mixed dispersion into a petri dish, drying at normal temperature first, leaving the alloy settle to the bottom of the film naturally, and drying in an oven to fully volatilize the solvent for forming the upper layer, which is a nanocarbon material layer, and the lower layer is an uncrosslinked rubber/nanocarbon material/low melting point alloy film doped with a low melting point alloy layer of nanocarbon material and (v) attaching the low melting point alloy layer of uncrosslinked rubber/nanocarbon material/low melting point alloy film to each other, attaching conductive glue to both ends of the low melting point alloy layer doped with nano carbon material in the middle, and vulcanizing to obtain a rubber/nano carbon/low melting point alloy composite thin film device.