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Characterization of the interaction behavior between CQDs and alkali salts. a–d) FTIR spectra at 600–650 cm−1 and corresponding Gaussian–Lorentzian fitting curves for a) PEO‐Li, b) PEO/CQDs‐Li, c) PEO‐Na, and d) PEO/CQDs‐Na. e) Zeta potential of LiClO4/CQDs samples with different weight ratios in alcohol suspension. f) Schematic illustration showing ion transport mechanism in PEO SPE and PEO/CQDs NPE.
