CdS-Modified TiO2 Nanotubes with Heterojunction Structure: A Photoelectrochemical Sensor for Glutathione

Guo-Na Huo; Sha-Sha Zhang; Yue-Liu Li; Jia-Xing Li; Zhao Yue; Wei-Ping Huang; Shou-Min Zhang; Bao-Lin Zhu

doi:10.3390/nano13010013

CdS-Modified TiO₂ Nanotubes with Heterojunction Structure: A Photoelectrochemical Sensor for Glutathione

Nanomaterials (Basel). 2022 Dec 20;13(1):13. doi: 10.3390/nano13010013.

Authors

Guo-Na Huo^{1

2}, Sha-Sha Zhang¹, Yue-Liu Li¹, Jia-Xing Li¹, Zhao Yue³, Wei-Ping Huang¹, Shou-Min Zhang¹, Bao-Lin Zhu^{1

4}

Affiliations

¹ College of Chemistry, The Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, China.
² Chemistry and Chemical Engineering College, Xingtai University, Xingtai 054000, China.
³ Department of Microelectronics, Nankai University, Tianjin 300350, China.
⁴ National Demonstration Center for Experimental Chemistry Education (Nankai University), Tianjin 300071, China.

Abstract

The formation of heterojunction structures can effectively prevent the recombination of photogenerated electron-hole pairs in semiconductors and result in the enhancement of photoelectric properties. Using TiO₂ nanotubes (prepared using the hydrothermal-impregnation method) as carriers, CdS-TiO₂NTs were fabricated as a photoelectrochemical (PEC) sensor, which can be used under visible light and can exhibit good PEC performance due to the existence of the heterojunction structure. The experimental results show that the prepared CdS-TiO₂NTs electrode had a linear response to 2-16 mM glutathione (GSH). The sensor's sensitivity and detection limit (LOD) were 102.9 µA·mM^-1 cm^-2 and 27.7 µM, respectively. Moreover, the biosensor had good stability, indicating the potential application of this kind of heterojunction PEC biosensor.

Keywords: CdS; TiO2 nanotubes; heterojunction structure; photoelectrochemical sensor.

Abstract

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