Optical and Structural Characterization of Cu-Doped Ga<sub>2</sub>O<sub>3</sub> Nanostructures Synthesized via Hydrothermal Method
In this study, we investigate the optical and structural properties of Cu-doped <i>β</i>-Ga<sub>2</sub>O<sub>3</sub> nanostructures synthesized via a hydrothermal method, followed by annealing in ambient O<sub>2</sub>. Different Cu doping concentration...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/7/231 |
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| Summary: | In this study, we investigate the optical and structural properties of Cu-doped <i>β</i>-Ga<sub>2</sub>O<sub>3</sub> nanostructures synthesized via a hydrothermal method, followed by annealing in ambient O<sub>2</sub>. Different Cu doping concentrations (0, 1.6, and 4.8 at.%) are introduced to examine their effects on the crystal structure, chemical state, and optical bandgap of <i>β</i>-Ga<sub>2</sub>O<sub>3</sub>. X-ray diffraction (XRD) analysis reveals that the host <i>β</i>-Ga<sub>2</sub>O<sub>3</sub> crystal structure is preserved at lower doping levels, whereas secondary phases (Ga<sub>2</sub>CuO<sub>4</sub>) appear at higher doping concentrations (4.8 at.%). X-ray photoelectron spectroscopy (XPS) confirms the presence of Cu<sup>2+</sup> ions in both lattice substitution sites and surface-adsorbed hydroxylated species (Cu(OH)<sub>2</sub>). The optical bandgap of <i>β</i>-Ga<sub>2</sub>O<sub>3</sub> is found to decrease with increasing Cu concentration, likely due to the formation of localized states or secondary phases. These findings demonstrate the tunability of the optical properties of <i>β</i>-Ga<sub>2</sub>O<sub>3</sub> via Cu doping, providing insights into the incorporation mechanisms and their impact on structural and electronic properties. |
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| ISSN: | 2304-6740 |