Heterostructure-based 3D-CdS/TiO2 nanotubes/Ti: Photoelectrochemical performances and interface simulation investigation. Issue 24 (15th December 2022)

• Record Type: Journal Article
• Authors: Zhang, Sha-Sha; Tian, Jing; Yue, Zhao; Huo, Guo-Na; Hu, Zhi-Xin; Zhang, Shou-Min; Huang, Wei-Ping; Zhu, Bao-Lin
• Is Part Of: Ceramics international. Volume 48:Issue 24(2022)
• Page Start: 36731
• Page End: 36738
• Publication Date: 2022-12-15
• Subjects: Photoelectrochemical sensor -- 3D-CdS/TiO2 heterojunction nanotubes -- Visible light -- Density functional theory simulation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.234
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Heterojunction can effectively improve the charge separation efficiency and facilitate electron transfer, producing a strong photoelectric signal. By using 3D-TiO2 nanotubes/Ti foil as support, CdS–TiO2 heterojunction electrodes with different CdS proportions were fabricated as photoelectrochemical (PEC) biosensor to respond the visible irradiation and improve the PEC performance of TiO2 nanotubes. Density functional theory (DFT) simulation was conducted to clarify the PEC process of CdS–TiO2 NTs and revealed the important role of CdS in enhancing electron–hole separation on TiO2 nanotubes. Owing to the 3D tubular structure of the support, 2 mM CdS–TiO2 nanotubes/Ti PEC electrode exhibited low detection limit of 0.27 μM and good sensitivity of 328.87 μA mM −1 cm −2 for glucose in the range of 2–9 μM under visible illumination. The fabricated CdS–TiO2 nanotubes/Ti biosensor also showed high selectivity and good stability, which indicated a new candidate for biosensors.