ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection
ZnO/MO<sub>x</sub> (M = Fe<sup>III</sup>, Co<sup>II,III</sup>, Ni<sup>II</sup>, Sn<sup>IV</sup>, In<sup>III</sup>, Ga<sup>III</sup>; [M]/([Zn] + [M]) = 15 mol%) nanofiber heterostructures were obtained by co-electros...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/25/2/376 |
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| Summary: | ZnO/MO<sub>x</sub> (M = Fe<sup>III</sup>, Co<sup>II,III</sup>, Ni<sup>II</sup>, Sn<sup>IV</sup>, In<sup>III</sup>, Ga<sup>III</sup>; [M]/([Zn] + [M]) = 15 mol%) nanofiber heterostructures were obtained by co-electrospinning and characterized by X-ray diffraction, scanning electron microscopy and X-ray fluorescence spectroscopy. The sensor properties of ZnO and ZnO/MO<sub>x</sub> nanofibers were studied toward reducing gases CO (20 ppm), methanol (20 ppm), acetone (20 ppm), and oxidizing gas NO<sub>2</sub> (1 ppm) in dry air. It was demonstrated that the temperature of the maximum sensor response of ZnO/MO<sub>x</sub> nanofibers toward reducing gases is primarily influenced by the binding energy of chemisorbed oxygen with the surface of the modifier’s oxides. When detecting oxidizing gas NO<sub>2</sub>, high sensitivity at a low measurement temperature can be achieved with a high concentration of free electrons in the near-surface layer of zinc oxide grains, which is determined by the band bending at the ZnO/MO<sub>x</sub> interface characterized by the difference in the electron work function of ZnO and MO<sub>x</sub>. |
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| ISSN: | 1424-8220 |