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Fabrication of quantum-sized CdS-coated TiO2 nanotube array with efficient photoelectrochemical performance using modified successive ionic layer absorption and reaction (SILAR) method

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  • Materials Science
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Science Bulletin

Abstract

Quantum-sized CdS-coated TiO2 nanotube array (Q-CdS-TiO2 NTA) was fabricated by the modified successive ionic layer absorption and reaction method. Scanning electron microscope and transmission electron microscope images showed the regular structure of TiO2 NTA, where quantum-sized CdS (diameter <10 nm) deposited on both the inside and outside of TiO2 nanotube wall. Fabrication conditions including immersing cycles, calcination temperature and drying process were well optimized, and the Q-CdS-TiO2 NTA and its photoelectrochemical (PEC) properties were characterized by X-ray fluorescence spectrometer, UV–Vis diffuse reflectance spectra and photovoltage. Distinct increases in visible light absorption and photocurrent were observed as the immersing cycle was increased from 5 to 20 times. The additional drying process accelerated the CdS crystal growth rate, and thus, the fabrication time could be shortened accordingly. Calcination temperature influenced the PEC property of Q-CdS-TiO2 NTA deeply, and the optimized calcination temperature was found as 500 °C. As the Q-CdS-TiO2 NTA was fabricated under such condition, the visible photocurrent density increased to 2.8 mA/cm and the photovoltage between 350 and 480 nm was enhanced by 2.33 times than that without calcination. This study is expected to optimize Q-CdS-TiO2 NTA fabrication conditions for the purpose of improving its PEC performance.

抽象

本文采用改进的连续离子层吸附反应法(SILAR)制备了CdS量子点包覆的TiO2纳米管阵列(Q-CdS-TiO2 NTA)。扫描电子显微镜和透射电子显微镜结果表明,TiO2纳米管为有序阵列结构,CdS颗粒沉积在TiO2纳米管的内壁和外壁上,粒径小于10 nm。改变浸渍循环次数、焙烧温度以及干燥方法,并用X射线荧光光谱仪、紫外-可见分光光度计和光电压谱仪测试Q-CdS-TiO2 NTA样品的光电化学(PEC)性能,从而获得最优制备参数。浸渍循环次数从5次增加到20次时,Q-CdS-TiO2 NTA可见光吸附和光电流明显增大。干燥过程能够加快CdS晶体生长速度,缩短制备时间。与未焙烧的Q-CdS-TiO2 NTA相比,500 °C焙烧制备的Q-CdS-TiO2 NTA可见光电流密度增大至2.8 mA/cm2,350–480 nm间的光电压提高了2.33倍。上述研究结果为制备此类量子点包覆阵列材料提供了参考。

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21377020) and the Fundamental Research Funds for the Central Universities (DUT15QY17).

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Na Lu, Jingyuan Li, Hongtao Yu & Xie Quan

  2. Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian, 116024, China

    Na Lu

  3. Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024, China

    Yan Su

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  1. Na Lu
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  2. Yan Su
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  3. Jingyuan Li
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  4. Hongtao Yu
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Correspondence to Hongtao Yu.

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Lu, N., Su, Y., Li, J. et al. Fabrication of quantum-sized CdS-coated TiO2 nanotube array with efficient photoelectrochemical performance using modified successive ionic layer absorption and reaction (SILAR) method. Sci. Bull. 60, 1281–1286 (2015). https://doi.org/10.1007/s11434-015-0841-9

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  • DOI: https://doi.org/10.1007/s11434-015-0841-9

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