在 FTO 上制作掺铝 α-GaOOH 纳米棒阵列,用于自供电光电化学日光盲紫外光检测器

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Zhi-Yuan Zheng and Ming-Ming Fan
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引用次数: 0

摘要

以硝酸镓和硝酸铝混合水溶液(摩尔比固定为 1:1)为前驱体,通过水热法在 FTO 上生长了掺铝的α-GaOOH 纳米棒阵列。随着硝酸镓前驱体浓度的增加,纳米棒阵列中的镓/铝原子比从 0.36 增加到 2.08,长度从 650 nm 增加到 1.04 μm。根据 X 射线光电子能谱中 Ga 2p3/2 核电平与其背景之间的结合能差,带隙估计约为 5.3 ± 0.2 eV。掺铝 α-GaOOH 纳米棒阵列/FTO 光电化学光电探测器随着镓前驱体浓度的降低而显示出更强的自供电日盲紫外光探测特性。随着硝酸镓前驱体浓度的降低,α-GaOOH/电解质界面上的电荷转移电阻减小,载流子的传输路线缩短,载流子在重组中心的重组速度加快,电荷转移电阻减小,从而提高了光响应速度。稳定性和响应性有待进一步提高。尽管如此,这项工作首次证明了通过掺杂铝,在 FTO 上实现了 α-GaOOH 纳米棒阵列的自供电日光盲紫外光检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fabrication of Al doped α-GaOOH nanorod arrays on FTO for self-powered photoelectrochemical solar-blind UV photodetectors
Al doped α-GaOOH nanorod arrays were grown on FTO via hydrothermal processes by using gallium nitrate and aluminum nitrate mixed aqueous solutions with fixed 1:1 mole ratio as precursors. With increasing the gallium nitrate precursor concentrations, the Ga/Al atom ratios in nanorod arrays increase from 0.36 to 2.08, and the length becomes much longer from 650 nm to 1.04 μm. According to the binding energy difference between Ga 2p3/2 core level and its background in x-ray photoelectron spectroscopy, the bandgap is estimated to be around 5.3 ± 0.2 eV. Al doped α-GaOOH nanorod array/FTO photoelectrochemical photodetectors show enhanced self-powered solar-blind UV photodetection properties, with the decrease of Ga precursor concentrations. The maximum responsivity at 255 nm is 0.09 mA W−1, and the fastest response time can reach 0.05 s. The improved photoresponse speed is ascribed from much shorter transportation route, accelerated carrier recombination by recombination centers, and smaller charge transfer resistance at the α-GaOOH/electrolyte interface with decreasing the gallium nitrate precursor concentrations. The stability and responsivity should be further improved. Nevertheless, this work firstly demonstrates the realization of self-powered solar-blind UV photodetection for α-GaOOH nanorod arrays on FTO via Al doping.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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