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TiO₂ nanotube arrays decorated with Au and Bi₂S₃ nanoparticles for efficient Fe₃⁺ ions detection and dye photocatalytic degradation

Huang, J; Shen, J; Li, S; Cai, J; Wang, S; Lu, Y; He, J; ... Lai, Y; + view all (2020) TiO₂ nanotube arrays decorated with Au and Bi₂S₃ nanoparticles for efficient Fe₃⁺ ions detection and dye photocatalytic degradation. Journal of Materials Science & Technology , 39 pp. 28-38. 10.1016/j.jmst.2019.04.043. Green open access

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Abstract

Due to increasingly serious environmental problems, many researchers are investigating green clean-energy to solve the world's energy supply issues. So the strategy that Au nanoparticles (Au NPs) and bismuth sulfide (Bi₂S₃) NPs are used to evenly decorate TiO₂ nanotube arrays (TiO₂ NTAs) was carried out. Composite materials demonstrated enhanced solar light absorption ability and excellent photoelectrochemical performance. This was attributed to the presence of Bi₂S₃ NPs with a narrow band gap and the decoration with noble metallic Au NPs which resulted in local surface plasmon resonance (LSPR) effects. The Au/Bi₂S₃@TiO₂ NTAs composites exhibit improved photocatalytic activity for the degradation of methylene blue (MB) under irradiation of UV and visible light. Moreover, the Au/Bi₂S₃@TiO₂ NTAs exhibits high fluorescence emission at 822 nm. Due to the better binding affinity between Bi₂S₃, TiO₂ and Fe₃⁺ ions, the synthesized nanocomposites exhibit high selectivity to Fe₃⁺ ions. The number of binding sites for Au/Bi₂S₃@TiO₂NTAs was estimated to be 1.41 according to the double logarithmic regression method. The calculated value of “K” was 1862 M^{-1}. Fluorescence emission intensity decreases with increasing concentration (30 μM–5000 μM). The detection limit of the synthesized sensor is 0.221 μM.

Type: Article
Title: TiO₂ nanotube arrays decorated with Au and Bi₂S₃ nanoparticles for efficient Fe₃⁺ ions detection and dye photocatalytic degradation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jmst.2019.04.043
Publisher version: https://doi.org/10.1016/j.jmst.2019.04.043
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: TiO₂ nanotube, Au, Bi₂S₃, Photocatalysis, Fluorescence sensing
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10091055
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