▎ 摘　　要

NOVELTY - Preparation of platinum-tin-reduced graphene oxide-tin dioxide nanocomposite material (I) involves adding sodium dodecyl sulfate to graphene oxide dispersion, stirring and adding tin(II) chloride dihydrate and hexachloroplatinic acid hexahydrate to obtain a mixed solution, refluxing and reacting obtained mixed solution for 1-3 hours at 90-130℃, cooling to room temperature, adding hydrogen peroxide and stirring for 0.5-2 hours to obtain an intermediate product, and centrifuging the intermediate product to remove supernatant, washing, drying, heating to 500℃ at 10℃/minute in argon atmosphere, heat-treating for 1-3 hours and lowering to room temperature. USE - Preparation of platinum-tin-reduced graphene oxide-tin dioxide nanocomposite material (I) used for preparing hydrogen gas sensor (claimed). ADVANTAGE - The nanocomposite material (I) prepared by simple reflow method can effectively solve the problems of high working temperature, low sensitivity and high cost of hydrogen detection by traditional gas sensing materials. DETAILED DESCRIPTION - Preparation of platinum-tin-reduced graphene oxide-tin dioxide nanocomposite material of formula: PtSnx-rGO-SnO2(I) involves adding sodium dodecyl sulfate to graphene oxide dispersion, stirring and adding tin(II) chloride dihydrate and hexachloroplatinic acid hexahydrate to obtain a mixed solution, refluxing and reacting obtained mixed solution for 1-3 hours at 90-130℃, cooling to room temperature, adding hydrogen peroxide and stirring for 0.5-2 hours to obtain an intermediate product, and centrifuging the intermediate product to remove supernatant, washing, drying, heating to 500℃ at 10℃/minute in argon atmosphere, heat-treating for 1-3 hours and lowering to room temperature. INDEPENDENT CLAIMS are included for: (1) platinum-tin-reduced graphene oxide-tin dioxide nanocomposite material (I); and (2) preparation of hydrogen gas sensor based on the nanocomposite material (I), which involves: (a) putting platinum-tin-reduced graphene oxide-tin dioxide (PtSn2-rGO-SnO2) nanocomposite in absolute ethanol to form a uniform slurry, in the ratio of 5-10 mg:50-60 μL; (b) applying slurry of the nanocomposite material (I) on gas sensor element, so that plane electrode surface of the gas sensor element is completely covered with the nanocomposite material (I); and (c) aging the gas sensing element coated with the nanocomposite material (I) at 180-250℃ for 10-14 hours.