Ultrasonic-assisted liquid phase exfoliation for high-yield monolayer graphene with enhanced crystallinity

Graphene stands as a promising material with vast potential across energy storage, electronics, etc. Here, we present a novel mechanical approach utilizing ultrasonic high-energy intercalation exfoliation to extract monolayer graphene from graphite, offering a simple yet efficient alternative to conventional methods. Through a comprehensive series of characterizations involving atomic force microscopy, scanning electron microscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, the resulting graphene nanosheets demonstrate superior crystallinity compared to those obtained via the conventional method. The high-crystalline freestanding graphene nanosheets derived from this method not only facilitate easier separation but also significantly enhance the physical performance of the original materials. This method showcases the potential for scalable production of layered materials with increased yield and crystallinity, paving the way for their utilization in various applications. • Developed a novel ultrasonic intercalation exfoliation method to synthesize high-crystallinity monolayer graphene. • Graphene nanosheets exhibited thickness 0.5 nm and micro-sized dimensions, confirmed by AFM and SEM. • XRD and Raman analysis revealed the layered and turbostratic structure of the prepared graphene. • XPS data showed uniform deposition of graphene on copper foil, altering the surface chemical bonding. • Approach enables scalable production of high-quality graphene, enhancing its applications across diverse fields.