▎ 摘　　要

NOVELTY - Providing an air- and/or moisture-barrier coating (215) on at least a portion of a two-dimensional material, comprises: (i) providing a substrate (200) having a two-dimensional material, on it; (ii) providing a composition comprising an inorganic oxide, fluoride or sulfide precursor and a doping agent; (iii) coating (210) the composition onto at least a portion of the two-dimensional material; and (iv) curing and/or annealing the coated two-dimensional material at a temperature of not greater than1200degrees Celsius to convert the inorganic oxide, fluoride or sulfide precursor into an inorganic oxide, fluoride or sulfide air- and/or moisture-barrier coating on at least a portion of the two-dimensional material, where the doping agent dopes the two-dimensional material. USE - The method is useful for providing an air- and/or moisture-barrier coating on at least a portion of a two-dimensional material which is used in an electronic device comprising a Hall sensor (all claimed). ADVANTAGE - The method: enables a simpler manufacturing process without having to ensure such a strict exclusion of contact with the atmosphere without substantially affecting the graphene properties due to the minimal exposure; provides improved by having a barrier coating that protects the graphene layer structure from the air and moisture present in the atmosphere; provides an improved approach for providing a doped two-dimensional material, preferably graphene; and is economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a doped two-dimensional material, obtainable by the method. DESCRIPTION OF DRAWING(S) - The figure shows the method for providing an air-and moisture-barrier coating on a graphene layer structure and shows cross-sections of the intermediate products and of the final coated graphene layer structure. Substrate (200) Graphene layer structure (205) Coating (210) Air- and moisture-barrier coating (215) Doped graphene layer structures (220)