▎ 摘　　要

NOVELTY - Preparing graphene sheet with narrowing transverse dimension comprises mixing the oxidized graphite with deionized water, magnetically agitating, centrifuging, obtaining supernatant solution and the first lower layer of settlement; (b) adding chemical reducing agent into the supernatant solution, and reducing; (c) mixing the first lower layer of settlement with deionized water, centrifuging, obtaining the second layer of settlement; and (d) mixing the second layer of settlement with deionized water, adding chemical reducing agent into the aqueous solution, and reducing. USE - The process is useful for preparing graphene sheet with narrowing transverse dimension (claimed). ADVANTAGE - The process has rational technique, simple operation, and low cost. Moreover, the prepared graphene has even transverse scale; where it can satisfy different application requirement, and it is appropriate for industrialized production. DETAILED DESCRIPTION - Preparing graphene sheet with narrowing transverse dimension comprises: (a) mixing the oxidized graphite with deionized water, magnetically agitating, obtaining the mixed solution of oxidized graphite and deionized water, subjecting the mixed solution to the first centrifugal treatment, obtaining supernatant solution and the first lower layer of settlement; (b) adding chemical reducing agent into the supernatant solution, reducing to obtain the spot-shaped graphene sheet with narrowing transverse dimension; (c) mixing the first lower layer of settlement with deionized water, subjecting the mixed solution to ultrasonic treatment and the second centrifugal treatment, obtaining the second layer of settlement; and (d) mixing the second layer of settlement with deionized water, obtaining oxidized graphene aqueous sol, adding chemical reducing agent into the aqueous solution, and reducing to obtain the sheet-like graphene sheet with narrowing transverse dimension. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the process for preparing graphene sheet with narrowing transverse dimension (Drawing includes non-English language text).