▎ 摘　　要

NOVELTY - A reduced grapheme oxide-coated platinum/tin dioxide nanoparticle cluster, comprises distributing uniformly platinum atoms on surface of tin dioxide to form an inner core and coating a reduced graphene oxide as a shell on surface of entire core, where the nanoparticle cluster is a core-like shell composite structure. USE - Reduced grapheme oxide-coated platinum/tin dioxide nanoparticle cluster for preparing gas sensor that is utilized in methanol gas detection, environmental detection, production safety detection, and disaster prevention. ADVANTAGE - The reduced grapheme oxide-coated platinum/tin dioxide nanoparticle cluster has low sensitivity, high temperature and, high sensitive detection, high stability, and can be prepared in simple, controllable and low in production cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing a reduced graphene oxide-coated platinum/tin dioxide nanoparticle cluster, involving taking a certain amount of water-soluble tin compound, dissolving in a solvent, stirring to obtain a uniform transparent solution, mixing a certain amount of dimethylformamide with the transparent solution to obtain a mixed solution, adding the graphene oxide powder to the deionized water, ultrasonically dispersing and performing a reduction treatment with a hydroiodic acid solution to obtain a reduced graphene oxide solution, adding a certain amount of chloroplatinic acid solution to the mixed solution, adding a basic substance, adjusting pH of the solution to alkaline to obtain a milky white precursor solution, mixing the reduced graphene oxide solution with the precursor solution, and carrying out hydrothermal synthesis reaction in a container lined with polytetrafluoroethylene, centrifuging a solution, after separation with ethanol and deionized water, washing, centrifuging, and rinsing to obtain a gelatinous product, drying the gelatinous product by two-step drying method and annealing to obtain the finished product (2) a method for preparing a gas sensor, involving coating a gelatinous product onto ceramic substrate by a spin coating process to obtain a ceramic substrate coated with a gel film,subjecting to a two-step drying method, and annealing to obtain annealed ceramic substrate, depositing an gold electrode on the annealed ceramic substrate using a standard photolithography process or a metal deposition technique to obtain the finished product.