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The morphologies of PCEC film. (a) Morphology of the PCEC film evaluated by SEM (n=3). The topological structure of the PCEC film had no fibres, and the surface was relatively smooth and featureless. (b) Morphology of the PCEC film evaluated by AFM (n=3). The topological structure of the PCEC film was detected randomly at 10 × 10 μm. The quantified surface roughness was 585.73 nm in height
