Solution-synthesized p-type CuMnO2 and n-type ZnO to form the core-shell nanowires for photo and gas sensing

The nanostructured p-n heterojunction has been synthesized by solution method. The n-type ZnO nanowires were hydrothermally synthesized on a glass substrate; meanwhile, the p-type CuMnO2 was deposited on n-type ZnO nanowires by the sol-gel method. It is well known that solution synthesis has the advantages of large area, low cost, and high efficiency. The n-ZnO/p-CuMnO2 core-shell nanowires revealed rectification and ultralow-leakage properties. The crystalline structures of the p-CuMnO2 and n-ZnO nanowires were amorphous and single crystal, respectively. The organic gas-sensing ability of the CuMnO2/ZnO NWs is very sensitive and fast (similar to 4 s); in addition, the photo-response to UV (365 nm), blue (445 nm), and green (520 nm) illumination was 6.3 x 10(5) , 4.3 x 10(3) and 50.5, respectively. The above results prove that p-n heterojunction can improve the gas sensing and photo-response of nanomaterials. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study successfully synthesized n-ZnO/p-CuMnO2 core-shell nanowires by solution method, exhibiting good rectification and ultra-low leakage properties, as well as sensitivity and rapid response to organic gases and light of different wavelengths.