Details

Autor(en) / Beteiligte

• Abebe, Buzuayehu
• Tsegaye, Dereje
• Sori, Chaluma
• Ravikumar, C.R.
• Murthy, H.C. Ananda

Titel

Synthesis of optically enriched cobalt-doped zinc oxide nanocomposites: Reduction of methylene blue dye

Ist Teil von

• Optical materials, 2023-08, Vol.142, p.114072, Article 114072

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This study reports the synthesis of highly pure nanosized composite materials using a sol-gel self-combustion synthesis (SCS) approach. The complex generated within the polyvinyl alcohol and precursor(s) induces combustion once the ignition temperature is reached, resulting in a porous nanocatalyst as the gaseous by-products are removed. The XRD and TEM morphological analyses confirmed the crystalline nature, interstitial inclusion of cobalt into the ZnO lattice, and the nanoscale size range (20–50 nm) of the synthesized materials. The photoluminescence spectra of the doped nanocomposites showed a significant decrease in intensity as well as a high percentage of visible light absorption potential over pure ZnO NPs. This confirms the presence of better charge transfer and its significance in preventing electron-hole recombination processes. The UV–vis-DRS and Mot-Schottky investigations showed better optoelectronic properties for the cobalt-doped ZnO composites (CZ-Cs) compared to that of the pure ZnO NPs. The indirect bandgap reduction (redshift) from 3.22 to 2.70 eV shows the perfect inclusion of cobalt in the ZnO lattice. It was revealed that the CZ-Cs showed better catalytic reduction potential for methylene blue dye within 12 min than ZnO. Thus, the solution combustion synthesis approach effectively synthesizes optoelectrically improved nanocomposite materials, which have promising prospects for catalysis, sensors, and biomedical applications. [Display omitted] •The combustion synthesis approach can create porous doped materials.•The porosity occurred at the surfactant-precursor-complex ignition point as gas evolved.•Optoelectricity is crucial for light adsorption and the charge transfer process.•Thus, the combustion method is promising for the production of porous materials.