Fabrication of CuO ( p )-ZnO ( n ) Core-Shell Nanowires and Their H 2 -Sensing Properties.

Autor: Sisman O; Department of Functional Materials, FunGlass Center, Alexander Dubcek University of Trencin, 91150 Trencin, Slovakia., Zappa D; Sensor Laboratory, Department of Information Engineering (DII), University of Brescia, Via Valotti 7, 25123 Bresica, Italy., Maraloiu VA; National Institute of Materials Physics, 077125 Magurele, Romania., Comini E; Sensor Laboratory, Department of Information Engineering (DII), University of Brescia, Via Valotti 7, 25123 Bresica, Italy.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2023 Jul 03; Vol. 16 (13). Date of Electronic Publication: 2023 Jul 03.
DOI: 10.3390/ma16134802
Abstrakt: Unlike the conventional one-dimensional (1D) core-shell nanowires (NWs) composed of p -type shells and n -type cores, in this work, an inverse design is proposed by depositing n -type ZnO (shell) layers on the surface of p -type CuO (core) NWs, to have a comprehensive understanding of their conductometric gas-sensing kinetics. The surface morphologies of bare and core-shell NWs were investigated by field emission scanning electron microscope (FE-SEM). The ZnO shell layer was presented by overlay images taken by electron dispersive X-ray spectroscopy (EDX) and high-resolution transmission electron microscopy (HRTEM). The pronounced crystalline plane peaks of ZnO were recorded in the compared glancing incident X-ray diffraction (GI-XRD) spectra of CuO and CuO-ZnO core-shell NWs. The ZnO shell layers broaden the absorption curve of CuO NWs in the UV-vis absorption spectra. As a result of the heterostructure formation, the intrinsic p -type sensing behavior of CuO NWs towards 250 and 500 ppm of hydrogen ( H 2 ) switched to n -type due to the deposition of ZnO shell layers, at 400 °C in dry airflow.
Competing Interests: The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.
Databáze: MEDLINE
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