▎ 摘　　要

NOVELTY - A lead selenide quantum dot-graphene composite material comprises lead selenide quantum dots that are loaded on the graphene surface. The quantum dots are uniformly distributed on both surfaces of graphene. The lead-selenide quantum dot has size of 2-30 nm. The number of layers of the graphene is 1-5. The length and width of the graphene are in the range of 500 nm-2.0 mu m. The mass ratio of graphene and lead selenide quantum dots is 0-1. USE - Lead selenide quantum dot-graphene composite material used in thermoelectric application. ADVANTAGE - The lead selenide quantum dot-graphene composite material is prepared by simple process conveniently with high electron transport property, and high Seebeck coefficient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of lead selenide quantum dot loaded graphene composite material, which involves (a) adding soluble lead salt to aqueous graphene oxide solution to obtain a mixed solution, adding an alkaline solution to the mixed solution to a pH of 9-10 to obtain an oxidized graphene-lead ion complex solution, (ii) preparing selenium precursor solution under nitrogen atmosphere, (iii) adding selenium precursor solution to oxidized graphene-lead ion complex solution, where the ratio of selenium powder and lead nitrate is (1-10):1, reflux reacting at 20-180 degrees C for 1-24 hours under nitrogen protection atmosphere, and separating black solid, (iv) adding black solid to water, ultrasonically dispersing uniformly, adding reductant, adjusting the pH to 12-13 with alkali, reflux reacting at 40-100 degrees C for 2-24 hours, and isolating the resulting solid product.