▎ 摘　　要

It looks like graphene is ready for production, at least for new applications which need to use its unique properties. As doped-graphene is a typical two-dimensional (2D) superconductor, graphene has showed the possibilities for practical applications besides the significant meaning in studying relevant physical problems. We report a novel development in fabricating large-area graphene-based superconducting film (GSF) via self-assembly and in-situ calcium (Ca) intercalation. As-fabricated GSF can be tailored into puzzle-sized and arbitrary-shaped superconducting pieces, demonstrating outstanding processability. GSF shows a superconducting transition at similar to 11 K and an upper critical field Hc2 at 9.85 kOe. Especially, GSF exists stably for dozens of minutes in the atmosphere. Given these advantages, GSF points out a new application direction of graphene and provides a platform for studying 2D superconductors. The selfassembly and in-situ doping method also pave a new way for the application of free-standing 2D superconductors. (C) 2019 Elsevier Ltd. All rights reserved.