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14 August 2024 Study on enzyme-free glucose sensor based on Au and CuO co-modified TiO2 films for photoelectrochemical detection
Weijian Zhu, Shaolong Wu, Lipeng Qiu, Yuchen Wu, Meng Wang, Linling Qin
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Proceedings Volume 13248, Fourth Optics Frontier Conference (OFS 2024); 132480A (2024) https://doi.org/10.1117/12.3032746
Event: Fourth Optics Frontier Conference (OFS 2024), 2024, Hangzhou, China
Abstract
Currently, widely used glucose sensors rely on enzyme catalysts, which suffer from issues such as enzyme inactivation, high production costs, and insufficient stability. To address these challenges, this study fabricated TiO2 films on Ti sheets using radio frequency magnetron sputtering and subsequently modified Au nanoparticles (NPs) and CuO films via direct current magnetron sputtering. Then, Au and CuO co-modified TiO2 (CuO-Au@TiO2) photoelectrode with a Z-type band structure was prepared, enabling enzyme-free glucose detection via photoelectrochemical (PEC) sensing technology. The optimized photoelectrode exhibited high sensitivity for glucose detection, with values of 7300 μA μM-1 cm-2 (0–1 mM) and 500 μA μM-1 cm-2 (1–10 mM) under AM 1.5G illumination at a bias of 0.2 V (vs. Ag/AgCl). The detection limit was determined to be 58.14 μM (Signal/Noise = 3), with excellent stability, repeatability, and selectivity. Spectral and PEC performance analyses revealed that the outstanding sensing performance of the CuO-Au@TiO2 photoelectrode can be attributed to: (1) unique Z-Type band structure promoting carrier separation; (2) the local surface plasmon resonance (LSPR) effect induced by Au NPs enhancing light absorption; (3) CuO can undergo a specific enzyme-like catalytic reaction with glucose molecules under alkaline conditions. This research offers a novel, convenient, and accurate monitoring approach for diabetes management and prevention.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Weijian Zhu, Shaolong Wu, Lipeng Qiu, Yuchen Wu, Meng Wang, and Linling Qin "Study on enzyme-free glucose sensor based on Au and CuO co-modified TiO2 films for photoelectrochemical detection", Proc. SPIE 13248, Fourth Optics Frontier Conference (OFS 2024), 132480A (14 August 2024); https://doi.org/10.1117/12.3032746
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KEYWORDS
Glucose
Gold
Sputter deposition
Sensors
Photocurrent
Thin films
Signal detection
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