▎ 摘　　要

NOVELTY - A bandgap retaining graphene material comprises graphene and lithium ions adsorbed on the graphene. USE - Bandgap retaining graphene material is used in semiconductor device and electronic device. ADVANTAGE - The bandgap retaining graphene material has improved intrinsic properties, and is capable of stably forming on/off state in the electronic device. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of bandgap retaining graphene material; and (2) method for confirming adsorption amount of lithium ions.