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Conductive polymers filled with carbon nanotubes have been proved to have negative permittivity but the mechanism of its strange properties has not been intensively studied.

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Inorganic particles/polyaniline (PANI) composite materials showed negative permittivity in recent years so that different conductive polymers filled with a wide variety of inorganic particles have been investigated for higher negative permittivity. However, the generation mechanism on negative dielectric properties of these inorganic particles/conductive polymers was still controversial. For this target, the generation mechanism of the negative dielectric properties of the metal oxide/PANI composite was studied in present study. Both PANI and Al 2 O 3 /PANI composites synthesized were found possessing negative permittivity. On the basis of structural analysis, the structure model of "crystal-nanowire" was constructed to explain the generation mechanism of negative permittivity of Al 2 O 3 /PANI composites. For further verifying the structure model, a variety of metal oxides were selected to prepare metal oxide/PANI composite materials. Negative dielectric effects were also found, proving the universality of this structure model to understand the generation mechanism of negative permittivity of Al 2 O 3 /PANI composites.

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