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A broadband photodetector based on Au nanoparticle/double-walled carbon nanotube film/TiO2 nanotube array /Ti multilayer heterojunction structures has been fabricated. A pre-electroforming process at a voltage bias of 35V was used to switch the photodetector from a high resistance state to a low resistance state. At a voltage bias of 1V under 532-nm laser illumination in air, the photoresponsivity...
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