Enhancement of Photocatalytic Performance of Ga2O3 Films with Different Thicknesses Under UVC Light

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-04-30 DOI:10.1007/s10562-025-05032-6

Ebru Şenadım Tüzemen

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引用次数: 0

Abstract

Photocatalytic oxidation is a promising green technology for the degradation of toxic organic pollutants in water, offering an eco-friendly alternative that primarily generates harmless by-products such as CO₂ and H₂O. In this study, gallium oxide (Ga₂O₃) thin films with varying thicknesses were synthesized using RF magnetron sputtering to optimize their photocatalytic efficiency for environmental remediation. The films were structurally and optically characterized, revealing a clear correlation between film thickness and optical band gap. Notably, the band gap narrowed with increasing thickness, ranging from 5.13 to 4.95 eV for unannealed films, and from 5.03 to 4.91 eV for films annealed at 500 °C. According to the XRD results, diffraction peaks were observed at 35.9° and 63.78° in the 342.4 nm Ga₂O₃ film produced at 500 °C. These peaks correspond to the (111) and (403) planes of the β-Ga₂O₃ phase. Photocatalytic activity, evaluated through the degradation of organic pollutants under UVC illumination, reached its peak in the unannealed 126.1 nm film and the annealed 342.4 nm film. These results indicate that precise control of film thickness and thermal treatment can significantly enhance photocatalytic performance. The study confirms that Ga₂O₃ is a highly stable and effective photocatalyst, with strong potential for sustainable water purification and advanced optoelectronic applications such as UV photodetectors and solar-assisted catalytic systems.

Graphical Abstract

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UVC光下不同厚度Ga2O3薄膜光催化性能的增强

光催化氧化是一种很有前途的绿色技术，用于降解水中有毒有机污染物，提供了一种主要产生无害副产品（如CO2和H2O）的环保替代方案。本研究利用射频磁控溅射技术合成了不同厚度的氧化镓（Ga2O3）薄膜，以优化其光催化修复环境的效率。对薄膜进行了结构和光学表征，揭示了薄膜厚度与光学带隙之间的明显相关性。值得注意的是，带隙随着厚度的增加而缩小，未退火薄膜的带隙范围为5.13 ~ 4.95 eV， 500℃退火薄膜的带隙范围为5.03 ~ 4.91 eV。XRD结果表明，在500℃下制备的342.4 nm Ga2O3薄膜在35.9°和63.78°处观察到衍射峰。这些峰对应于β-Ga2O3相的（111）面和（403）面。通过UVC光照下对有机污染物的降解评价，光催化活性在未退火的126.1 nm膜和退火的342.4 nm膜中达到峰值。这些结果表明，精确控制膜厚和热处理可以显著提高光催化性能。该研究证实了Ga2O3是一种高度稳定和有效的光催化剂，在可持续水净化和先进光电应用（如紫外光电探测器和太阳能辅助催化系统）方面具有强大的潜力。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.