▎ 摘　　要

NOVELTY - Preparing mesoporous tin oxide nanorod/nitrogen doped graphene sensitive material comprises (1) mixing the tin salt solution and polyvinyl alcohol in a mass ratio of 1:(1-15) to obtain solution A, (2) mixing graphene oxide and tertiary butyl alcohol in (0.01-5):(5-40), obtaining suspension B, (3) smixing the solution A and the suspension B in the feeding ratio of 1:(0.2-4), adding nitrogen doping agent to obtain the precursor solution C and (4) orderly freezing and drying the precursor solution C, heat treating and cooling to obtain the mesoporous tin oxide nano rod/nitrogen doped graphene sensitive material. USE - The material is useful in the formaldehyde processing field, preferably for absorbing formaldehyde (claimed). ADVANTAGE - The method: controls the morphology and porosity of the material, the distribution state of the heterojunction and improves the adsorption and sensitivity effects of the material on the target gas molecule by adjusting the composition of the reaction medium and the freeze-drying process; has simple preparation and convenient operation. The material has strong controllability, low detection limit, linear response and high sensitivity to formaldehyde gas. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a mesoporous tin oxide nano rod/nitrogen doped graphene sensitive material obtained by the above preparation method. The mesoporous tin oxide nano rod/nitrogen doped graphene sensitive material is nano rod-shaped structure of 0.2-5 mu m.