Abstract
AbstractA novel and highly sensitive p–n heterojunction sensor composed of zero‐dimensional (0D) CuO nanoparticles (NPs) and one‐dimensional (1D) ZnO nanorods (NRs) was fabricated using a solution‐based process. The structures were characterized with scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS). The formation of electron depletion layers in the p‐CuO and n‐ZnO is believed to increase the adsorption of NO2, resulting in a 6‐fold response improvement and a 13‐fold increased sensitivity compared to ZnO NRs alone. We believe that this type of heterojunction device can be applied to many different sensing applications.
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