A Novel Preparation Method of Multi-Layer Graphene with High-Crystallinity Based on Liquid Exfoliation Method by Using Expandable Graphite

The low-cost commercial expandable graphite (EG) is adopted as raw materials to fabricate graphene based on liquid exfoliation method. Volume-restricted expansion in this work is proposed to acquire good carbon precursor for further exfoliation. Morphology analysis results demonstrate that the multi-layer graphene (MLG) is obtained from exfoliating the volume-restricted expanded graphite (EdG). Raman spectrum and X-ray diffraction (XRD) patterns indicate that the obtained graphene is in high-crystallinity and contains few defects. XPS and FTIR analysis show that the as-prepared graphene contains seldom oxygen-containing groups and the TGA demonstrate the outstanding thermal stability of the as-prepared graphene.