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Transmission electron microscope (TEM) images of carbon quantum dots (CQDs) (a); g-C3N4 sheets (CN) (b); (c) low- and; (d) high-magnification TEM images of carbon nitride photocatalyst (CCN); (e) HRTEM image of a CQD embedded in CCN, and SEM images together with elemental mapping of CN (f); and CCN (g).
