▎ 摘　　要

NOVELTY - The material has three-dimensional graphene foam as substrate, where the surface is loaded with titanium dioxide nanosphere. The middle point of the titanium dioxide nanosphere is embedded with a graphene quantum dot. The average pore diameter of the graphene foam in the ternary composite material is 240-260 mu m. The length of the hole wall is 170-190 mu m. The average thickness of the hole wall is 1.5-3 mu m. The average grain diameter of the titanium dioxide nanosphere is 300-400 nm. The average grain diameter of the graphene quantum dot is 3-5 nm. USE - Ternary composite material for use in detection of formaldehyde gas and used in gas sensor element (all claimed). ADVANTAGE - The ternary composite material has a three-dimensional pore structure, which has a large specific surface area, which is good for improving the response intensity and sensitivity of the formaldehyde gas. The titanium dioxide nano-grain and graphene quantum dot and graphene foam form heterogeneity (p-n-p) junction, which reduces the sensor working temperature and improves the gas-sensitive performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a gas sensor element. DESCRIPTION OF DRAWING(S) - The drawing shows a scanning electron microscope (SEM) image of porous titanium oxide nanospheres modified with graphene quantum dots in the ternary composite material.