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(A) Fluorescence spectra of CDs, CDs‐PEI and CDs‐PEI‐AS1411. Inset: optical images of CDs (left), CDs‐PEI (middle) and CDs‐PEI‐AS1411 (right) in aqueous solution under UV light. (B) The fluorescence decay curves of CDs, CDs‐PEI and CDs‐PEI‐AS1411. (C) Fluorescent intensity of CDs‐PEIAS1411 under 360 nm irradiation at different intervals of time. (D) Fluorescence profiles of CDs‐PEI‐AS1411 in water showing aqueous stability up to 15 d preservation time
