Precise CO 2 Reduction for Bilayer Graphene.

It is of great significance to explore unique and diverse chemical pathways to convert CO 2 into high-value-added products. Bilayer graphene (BLG), with a tunable twist angle and band structure, holds tremendous promise in both fundamental physics and next-generation high-performance devices. However, the π-conjugation and precise two-atom thickness are hindering the selective pathway, through an uncontrolled CO 2 reduction and perplexing growth mechanism. Here, we developed a chemical vapor deposition method to catalytically convert CO 2 into a high-quality BLG single crystal with a room temperature mobility of 2346 cm 2 V -1 s -1 . In a finely controlled growth window, the CO 2 molecule works as both the carbon source and the oxygen etchant, helping to precisely define the BLG nucleus and set a record growth rate of 300 μm h -1 .