TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Components: The iodized monolayer graphite refers to the iodized monolayer graphite which is formed by modifying the edge of monolayer graphite by sulfonic group; it is a two-dimensional structure that is formed by sp2 carbon atom and has thick unimolecule; the molecular frame is arranged in the shape of hexagonal crystal lattice and it can be dissolved in water, acetone, N,N-dimethyl formamide, or thionyl chloride; the area is 10 nm2 to 100 mu m2; the thickness is 0.3-2 nm; and the ratio of the number of sulfur atoms to that of carbon atoms is 1:16-48.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The functional monolayer graphite is the functional group containing a carboxyl, hydroxide radical, and/or epoxy group.    TECHNOLOGY FOCUS - POLYMERS - Preparation: The preparation method of the composite material comprises adding iodized monolayer graphite into water or organic solvent; ultrasonicating for 30-60 minutes to obtain dissolved dispersion; fully mixing with the dissolved dispersion of the polymer; stirring for 0.5 hours; carrying out ultrasonic treatment for 0.5-3 hours to form a mixed solution; and filtering the mixed solution to obtain the product. The preparation method of the composite material of iodized monolayer graphite and poly(3,4-ethylenedioxythiophene) comprises (1) dissolving functional monolayer graphite in the transparent solution; adjusting the pH value to 9-10; adding sodium borohydride to react for 90 minutes at 80 degrees C; centrifugally separating the precipitate and washing the precipitate with water to obtain the solid product; (2) re-dissolving the solid product in water; adding the mixed solution of diazonium salt, water, and hydrochloric acid; reacting for 2 hours in an ice bath; gradually heating to room temperature to react for 12 hours; centrifugally separating the precipitate and washing the precipitate with water to obtain the solid product; (3) re-dissolving the solid product in water; adding hydrazine hydrate; reacting for 24 hours at 100 degrees C; centrifugally separating the precipitate; washing the precipitate with water to obtain the solid product; and drying to obtain the lightly iodized monolayer graphite; (4) dissolving the lightly iodized monolayer graphite in oleum; reacting for 3 hours at 80 degrees C; adding nitrous acid, para-anilinesulfonic acid, and azobisisobutyronitrile to react for 2 hours; cooling down to room temperature; slowly adding the mixture into the water to precipitate the precipitate; filtering; washing the filter residue with water; re-filtering; dissolving the filter residue in acetone; filtering and drying filter residue at 50 degrees C to obtain iodized monolayer graphite; (5) adding 3,4-ethylenedioxythiophene and anhydrous ferric sulfate in iodized monolayer graphite that is ultrasonically dispersed in water; reacting for 48 hours at 50 degrees C; pouring reaction liquid in methanol; drastically stirring for 1 hour; precipitating the precipitate; filtering; repeatedly washing the filter residue with acetone and water until there is no 3,4-ethylenedioxythiophene in filtrate; and drying the filter residue to obtain the composite material of iodized monolayer graphite and poly(3,4-ethylenedioxythiophene). Preferred Components: The polymer is poly(3,4-ethylenedioxythiophene), polyaniline, and/or polypyrrole, preferably poly(3,4-ethylenedioxythiophene).