▎ 摘　　要

NOVELTY - Preparation of optical absorber with binary composite structure involves (i) dissolving a metal ammonium salt, thiourea and a molecular soft template agent in water to obtain a mixed solution, (ii) heating the mixed solution, reacting, cooling, collecting and washing to obtain two-dimensional transition metal sulfide microspheres, (iii) dispersing in an ethanol solution, (iv) adding aqueous ammonia and ethyl orthosilicate to obtained dispersion, reacting and separating to obtain a silica-coated two-dimensional transition metal sulfide composite powder, (v) passing the composite powder to a microwave generator, processing in a non-oxidizing environment, introducing a mixed gas of hydrogen and methane, and depositing graphene walls on the surface of the composite powder, and (vi) adding the composite powder to a sodium hydroxide aqueous solution, performing hydrothermal etching, collecting the obtained product, and washing. USE - Preparation of optical absorber with binary composite structure (claimed) used in adhesive system used in demand scenes of stray light absorption and suppression of optical systems. ADVANTAGE - The optical absorber uses two-dimensional transition metal sulfide microspheres as core layer material, and graphene wall as the shell layer material to form hollow structure. The two-dimensional transition metal sulfide and graphene walls based on the nano-sheet structure can provide multiple interface reflection and absorption for incident electromagnetic waves. Through the synergistic effect of the two-dimensional transition metal sulfide and graphene walls, the reflectivity of coating layer can be effectively reduced. In addition, the hollow structure between the two-dimensional transition metal sulfide microspheres and the graphene wall can increase the porosity of the coating layer, thereby reducing refractive index mutation between the coating layer and air. The optical absorber has good universality. The dimensional transition metal sulfide microspheres fully absorb the electromagnetic waves entering the hollow pores and improve the absorption performance of the coating layer. DETAILED DESCRIPTION - Preparation of optical absorber with binary composite structure involves (i) dissolving a metal ammonium salt, thiourea and a molecular soft template agent in water to obtain a mixed solution, (ii) heating the mixed solution, reacting in a reactor, cooling, collecting and washing to obtain two-dimensional transition metal sulfide microspheres, (iii) dispersing the microspheres in an ethanol solution to obtain a two-dimensional transition metal sulfide dispersion, (iv) adding aqueous ammonia and ethyl orthosilicate to the dispersion, fully reacting and separating to obtain a silica-coated two-dimensional transition metal sulfide composite powder, (v) passing the composite powder to a microwave generator, processing in a non-oxidizing environment, introducing a mixed gas of hydrogen and methane, and depositing graphene walls on the surface of the silica-coated two-dimensional transition metal sulfide composite powder, and (vi) adding the composite powder to a sodium hydroxide aqueous solution, performing hydrothermal etching, collecting the obtained product, and washing to obtain a graphene wall/two-dimensional transition metal sulfide optical absorber with hollow binary composite structure.