| Autor: |
Sayed, M.H., Gomaa, M.M., Eisa, W.H., Boshta, M. |
| Zdroj: |
Emergent Materials; 20230101, Issue: Preprints p1-7, 7p |
| Abstrakt: |
WO3films were chemically prepared by spray pyrolysis method using different starting tungsten precursors. The WO3layers were deposited at 450 °C and subsequently were heat treated at 500 °C in the air for 30 min. The effect of starting tungsten precursors on the physical properties and catalytic activity of WO3layers was investigated. The results of XRD show that the WO3films were crystalline and can be indexed to the monoclinic structure. The sample prepared using ammonium metatungstate precursor showed enhanced crystallinity and surface morphology. The diffuse reflection spectrophotometry shows that the obtained WO3films have a direct bandgap about of 2.7–2.9 eV. Chemical catalytic activity was evaluated through the reduction of 4-nitrophenol to 4-aminophenol. All prepared WO3thin films showed catalytic activity; however, the sample prepared using ammonium metatungstate precursor exhibited much higher catalytic activity when compared to the other precursors, which is consistent with other results. Furthermore, this sample demonstrated good stability and recyclability. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink