▎ 摘　　要

NOVELTY - Controlling grain boundary angle of two-dimensional material involves providing a substrate with specific crystal orientation and growing a two-dimensional material by chemical vapor deposition on the substrate where the substrate induced two-dimensional material is more than or equal to 2 different crystal orientations, the grain boundary angle of the two-dimensional material is determined by the crystal orientation of the substrate. USE - Method for controlling grain boundary angle of two-dimensional material which is used in the field of electronic device, optoelectronic device, and separation film (claimed). ADVANTAGE - The method enables to realize the preparation of two-dimensional material with specific grain boundary angle from bottom to top and provides material basis for related application and physical research. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing two-dimensional material with specific grain boundary angle which involves: i. providing a substrate with specific crystal orientation; ii. growing a two-dimensional material by chemical vapor deposition on the substrate where the substrate induced two- dimensional material is greater than or equal to 2 different crystal orientations, the specific grain boundary angle of the two-dimensional material is determined by the crystal orientation of the substrate; and (2) use of the two-dimensional material in the field of electronic device, optoelectronic device, and separation film.