Visible Illumination Enhanced Nonenzymatic Glucose Photobiosensor Based on TiO2 Nanorods Decorated With Au Nanoparticles

• Published in: IEEE transactions on biomedical engineering Vol. 65; no. 9; pp. 2052 - 2057
• Main Authors: Wang, Sin-Hui, Chang, Shoou-Jinn, Hsu, Cheng-Liang, Fang, Yu-Jui
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.09.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorption; Au Nanoparticles; Chemoreception; Electrodes; Glucose; Glucose - analysis; glucose sensor; Gold; Gold - chemistry; Illumination; Light; Lighting; Metal Nanoparticles - chemistry; Nanoparticles; Nanorods; Nanotubes - chemistry; Sensors; Sodium hydroxide; Substrates; Sugar; Surface plasmon resonance; Surface Plasmon Resonance - instrumentation; Surface Plasmon Resonance - methods; TiO2 nanorods; Titanium - chemistry; Titanium dioxide; visible illumination
• DOI: 10.1109/TBME.2017.2782732
• ISSN: 0018-9294

A nonenzymatic glucose photobiosensor was developed based on Au-nanoparticle-decorated TiO 2 nanorods (NRs) under visible illumination. Au nanoparticles (NPs) absorbed the visible illumination, resulting in surface plasmon resonance (SPR). The SPR of the Au NPs indicated that there was a strong electric field around them, which promoted the transport of more electrons to the TiO 2 NRs and enhanced the glucose sensing properties. The sensing current under visible illumination was five times higher than in the dark when in 0.1 M NaOH solution at a potential of 0.17 V. Moreover, the Michaelis-Menten constant (Km) of the Au NPs/TiO 2 NRs/FTO under visible illumination was 0.52 mM, which is much smaller than that reported previously. Moreover, these results indicate that the Au NPs/TiO 2 NRs/FTO under visible illumination feature outstanding properties as a nonenzymatic glucose photobiosensor.