Core-shell nanowire arrays based on ZnO and CuxO for water stable photocatalysts
| Autor: | Ionut Enculescu, Cristina Popa, Andreea Costas, Mihaela Beregoi, Andrei Kuncser, Nicoleta Preda, Gabriel Socol, Nicoleta G. Apostol, Victor C. Diculescu, Camelia Florica |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thermal oxidation
Multidisciplinary Materials science business.industry Band gap lcsh:R Nanowire lcsh:Medicine Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid Optoelectronics Charge carrier lcsh:Q 0210 nano-technology business lcsh:Science Dissolution Wurtzite crystal structure |
| Zdroj: | Scientific Reports, Vol 9, Iss 1, Pp 1-15 (2019) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-019-53873-0 |
| Popis: | Staggered gap radial heterojunctions based on ZnO-CuxO core-shell nanowires are used as water stable photocatalysts to harvest solar energy for pollutants removal. ZnO nanowires with a wurtzite crystalline structure and a band gap of approximately 3.3 eV are obtained by thermal oxidation in air. These are covered with an amorphous CuxO layer having a band gap of 1.74 eV and subsequently form core-shell heterojunctions. The electrical characterization of the ZnO pristine and ZnO-CuxO core-shell nanowires emphasizes the charge transfer phenomena at the junction and at the interface between the nanowires and water based solutions. The methylene blue degradation mechanism is discussed taking into consideration the dissolution of ZnO in water based solutions for ZnO nanowires and ZnO-CuxO core-shell nanowires with different shell thicknesses. An optimum thickness of the CuxO layer is used to obtain water stable photocatalysts, where the ZnO-CuxO radial heterojunction enhances the separation and transport of the photogenerated charge carriers when irradiating with UV-light, leading to swift pollutant degradation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |