Ternary composite nanomaterial, preparation method and application thereof, and paper-based sensor

The invention relates to a ternary composite nano material, a preparation method and application thereof, and a paper-based sensor. The preparation method of the ternary composite nano material specifically comprises the following steps: S1, carrying out in-situ polymerization on the surface of a zeolite imidazate skeleton-8 to obtain a binary composite nano material coated with polydopamine; and S2, compounding the binary composite nano-material in the step S1 with a graphene nano-sheet to prepare the ternary composite nano-material. The graphene nanosheets are graphene oxide, and the sheet diameter is 1t; and the surface contains amino groups. The paper-based sensor comprises an electrode material and a paper-based electrode, wherein the electrode material is prepared by performing vacuum filtration on the ternary composite nano material to cellulose paper. The portable paper-based sensor provided by the invention realizes rapid and instant analysis of Cd < 2 + >. 本发明涉及一种三元复合纳米材料及其制备方法和应用、纸基传感器。其中，三元复合纳米材料的