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a HOMO-n and b LUMO + n orbitals of the single-layered g-C3N4, respectively. c HOMO-n and d LUMO + n orbitals of the double-layered g-C3N4, respectively. Reproduced from Ref. [87] by permission of John Wiley & Sons Ltd. e Schematic illustration of the controllable synthesis of g-C3N4 nanosheets, nanoribbons, and quantum dots. Reproduced from Ref. [86] by permission of the Royal Society of Chemistry
