Figure 1

Schematic illustration for the preparation of monolayer graphene.

(A) Edge-selective oxidization of graphite (EOG) by low concentration of KMnO₄ at 60°C. (B): Long-chain tetradecyl-ammonium salt (C₁₄N⁺) spontaneous intercalated into EOG. (C) Gentle and short time sonication to exfoliate EOG into monolayer graphenes.