Citation: YAO Meng-Ting, QI Kai-Li, MEI Zheng-Fang, CHEN Rong-Sheng. Fabrication of Carbon Quantum Dots Decorated TiO₂ Nanotube Arrays for Photoelectrochemical Determination of 5-Hydroxytryptamine[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(12): 2005-2014. doi: 10.19756/j.issn.0253-3820.210432 shu

Fabrication of Carbon Quantum Dots Decorated TiO₂ Nanotube Arrays for Photoelectrochemical Determination of 5-Hydroxytryptamine

State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

Corresponding author: CHEN Rong-Sheng, chenrs@wust.edu.cn
Received Date: 12 April 2021
Revised Date: 2 September 2021

Fund Project: Supported by the National Key R&D Program of China (No.2020YFC1909702).

A novel photoelectrochemical (PEC) sensor was constructed based on carbon quantum dots decorated titanium dioxide nanotube arrays (TiO₂ NTAs/CQDs). Highly ordered self-supporting titanium dioxide nanotube arrays (TiO₂ NTAs) were prepared on the surface of a titanium foil by electrochemical anodization. The diameter and the length of TiO₂ nanotube were around 80 nm and 8 μm, respectively. CQDs were prepared by electrochemical anodization of a graphite electrode, with a diameter of 3-9 nm. Uniformly distributed CQDs were decorated on the inner walls of TiO₂ NTAs by hydrothermal treatment, examined by TEM observation. CQDs could effectively reduce the band gap of TiO₂ NTAs and enhanced its response under visible light. CQDs were electron acceptors that could promote the separation of photo-generated electron-hole pairs. The conductance of TiO₂ NTAs was also enhanced by CQDs decoration. Under visible light, TiO₂ NTAs/CQDs exhibited excellent PEC response toward 5-hydroxytryptamine (5-HT), with a linear range of 20-300 μmol/L and a detection limit of 11.5 μmol/L (S/N=3). Moreover, the PEC sensor showed good selectivity and stability for determination of 5-HT and was successfully applied to determination of 5-HT in human serum.
- Photoelectrochemical sensor,
- Titanium dioxide nanotube arrays,
- Carbon quantum dots,
- Visible light response,
- 5-Hydroxytryptamine
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沈阳化工大学材料科学与工程学院沈阳 110142

Fabrication of Carbon Quantum Dots Decorated TiO2 Nanotube Arrays for Photoelectrochemical Determination of 5-Hydroxytryptamine

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通讯作者: 陈斌, bchen63@163.com

Fabrication of Carbon Quantum Dots Decorated TiO₂ Nanotube Arrays for Photoelectrochemical Determination of 5-Hydroxytryptamine