▎ 摘　　要

NOVELTY - Preparing gas sensor based on graphene oxide-nickel-tindioxide micro-nano porous sensitive film, comprises (i) dissolving pentahydrate stannic chloride, nickel nitrate, nonahydrate aluminum nitrate, graphene as precursor in water, ultrasonicating to dissolve to obtain the precursor solution; (ii) forming orderly arranged single-layer organic colloid ball array layer on flat substrate, soaking flat substrate into the precursor solution, separating organic colloid ball array layer from flat substrate; (iii) cleaning and hydrophilic processing surface of gas sensor device, transferring organic colloid ball array layer floating in the precursor solution to surface of the gas sensor device, making the organic colloid ball array layer completely cover surface of device, filling precursor solution in the gap between the organic colloid ball array layer and device and between adjacent organic colloid balls, placing in an oven and drying; and (iv) annealing the dried gas sensor device. USE - The sensor is useful in detecting multiple volatile organic compounds gas (claimed). ADVANTAGE - The gas sensor has high sensitivity to VOC gas (e.g. alcohol, aldehydes, benzene and ketone), better selectivity, and ensures lowest detection limit can reach 5ppb, basically no response to interfering gases e.g. methane, hydrogen, carbon monoxide, nitric oxide and nitrogen dioxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for gas sensor based on graphene oxide-nickel-tindioxide micro-nano porous sensitive film.