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Fig.1 (a) Synthesis of chain-like nanofibers by electrospinning. (b) Surface coating of nanofibers by ALD alumina and annealing treatment for phase transition and pore formation of the shell. (c) Preparation of PEI/nanofibers composites by solution casting.
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Figure 2. Proposed mechanism of charge carriers or conductivity-induced high-temperature interfacial polarization. The yellow circles with positive and negative signs represent space charges.

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