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(A) UV–vis absorption spectra of KMnO4 and MnO2 in DI-H2O; the inset is a corresponding digital photo. (B) Zeta potential values of PSS@MnO2 and PAH@MnO2 (n = 3). (C) Dynamic light scattering (DLS) analysis results of PAH@MnO2 NPs; the inset shows the corresponding TEM.
