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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MDPI AG
2025-01-01
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| author | Vadim Platonov Oleg Sinyashin Marina Rumyantseva |
| author_facet | Vadim Platonov Oleg Sinyashin Marina Rumyantseva |
| author_sort | Vadim Platonov |
| collection | DOAJ |
| description | 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>. |
| format | Article |
| id | doaj-art-70983e59651b481b8fad98e57464ccb2 |
| institution | Kabale University |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-70983e59651b481b8fad98e57464ccb22025-01-24T13:48:41ZengMDPI AGSensors1424-82202025-01-0125237610.3390/s25020376ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas DetectionVadim Platonov0Oleg Sinyashin1Marina Rumyantseva2Chemistry Department, Moscow State University, Moscow 119991, RussiaFederal Research Center Kazan Scientific Center RAS, Kazan 420111, RussiaChemistry Department, Moscow State University, Moscow 119991, RussiaZnO/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>.https://www.mdpi.com/1424-8220/25/2/376ZnO nanofiberssurface modificationbinding energy of chemisorbed oxygenheterojunctionband bendingsemiconductor gas sensor |
| spellingShingle | Vadim Platonov Oleg Sinyashin Marina Rumyantseva ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection Sensors ZnO nanofibers surface modification binding energy of chemisorbed oxygen heterojunction band bending semiconductor gas sensor |
| title | ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection |
| title_full | ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection |
| title_fullStr | ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection |
| title_full_unstemmed | ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection |
| title_short | ZnO/MO<sub>x</sub> Nanofiber Heterostructures: MO<sub>x</sub> Receptor’s Role in Gas Detection |
| title_sort | zno mo sub x sub nanofiber heterostructures mo sub x sub receptor s role in gas detection |
| topic | ZnO nanofibers surface modification binding energy of chemisorbed oxygen heterojunction band bending semiconductor gas sensor |
| url | https://www.mdpi.com/1424-8220/25/2/376 |
| work_keys_str_mv | AT vadimplatonov znomosubxsubnanofiberheterostructuresmosubxsubreceptorsroleingasdetection AT olegsinyashin znomosubxsubnanofiberheterostructuresmosubxsubreceptorsroleingasdetection AT marinarumyantseva znomosubxsubnanofiberheterostructuresmosubxsubreceptorsroleingasdetection |