While CCTO NWs hold great potential to improve the properties of nanocomposite capacitors, no
method currently exists for their preparation and their integration is challenged by the barrier layer
capacitance which leads to high dielectric loss. Here, a novel two-step hydrothermal reaction is
developed for the large-scale synthesis of CCTO NWs and an insulating barrier layer is applied to
greatly reduce the loss while preserving the high dielectric constant.
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