| Autor: |
Nazir, Sadaf, Masood, Saima, Shivashankar, Srinivasrao A., Sheikh, Faheem A., Majeed, Shafquat |
| Zdroj: |
Vietnam Journal of Chemistry; August 2024, Vol. 62 Issue: 4 p500-505, 6p |
| Abstrakt: |
Due to the wide bandgap, monoclinic structure and thermodynamic stability, β‐polymorph form of Ga2O3nanomaterials is well‐received for various applications. However, as the γ‐Ga2O3is difficult to synthesize, less attention has been paid towards it and its conversion to β‐polymorph. This paper reports the single‐step synthesis of γ‐Ga2O3using a microwave‐assisted procedure. In this regard, γ‐Ga2O3powders are synthesized in minutes using benzyl alcohol as the solvent using gallium acetylacetone as the precursor. The XRD of the as‐prepared powders indicates the formation of the γ‐Ga2O3phase, the very broad peaks indicative of the small crystallite size as confirmed by TEM. The γ‐Ga2O3powders were annealed at different temperatures and the complete phase conversion of γ‐Ga2O3phase to β‐Ga2O3phase happens at 700 °C. The TEM analysis shows the crystallite size to be ≈10 nm for the annealed β‐Ga2O3phase. The as‐prepared nanopowders show very weak luminescence under excitation and in contrast, a blue‐green emission is observed in case of annealed powders. This confirms the presented strategy as having the potential to use β‐Ga2O3nanopowders for different optoelectronic applications. γ‐Ga2O3powders consisting of very small nanoparticles were synthesized through a rapid microwave assisted route and their thermal conversion to the oxide β‐Ga2O3phase studied. The as‐prepared γ‐Ga2O3powders show very weak luminescence under excitation whereas the annealed β‐Ga2O3nanopowders show a strong blue green emission. |
| Databáze: |
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