Ligand-to-metal charge transfer (LMCT) complex: New approach to non-enzymatic glucose sensors based on TiO2

Titanium metal covered with titanium dioxide (Ti/TiO2) was used as a promising non-enzymatic glucose sensor demonstrating a new approach to electrochemical glucose determination. A Ti/TiO2 nanotubes-glucose complex formation on an electrode surface was demonstrated by infrared, Raman, and X-ray phot...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-12, Vol.878, p.114589, Article 114589
Main Authors: Hovancová, Jana, Šišoláková, Ivana, Vanýsek, Petr, Oriňaková, Renáta, Shepa, Ivan, Kaňuchová, Mária, Király, Nikolas, Vojtko, Marek, Čudek, Pavel, Oriňak, Andrej
Format: Article
Language:English
Subjects:
Charge transfer
Complex formation
Coordination compounds
Electrochemical impedance spectroscopy
Glucose
Ligand-to-metal charge transfer complex
Non-enzymatic glucose sensor
Photoelectrons
Selectivity
Sensors
Spectrum analysis
Titanium
Titanium dioxide
Titanium dioxide glucose sensors
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Summary:Titanium metal covered with titanium dioxide (Ti/TiO2) was used as a promising non-enzymatic glucose sensor demonstrating a new approach to electrochemical glucose determination. A Ti/TiO2 nanotubes-glucose complex formation on an electrode surface was demonstrated by infrared, Raman, and X-ray photoelectron spectroscopy. The main electrochemical method used for glucose detection was electrochemical impedance spectroscopy as a promising method for an easy electrochemical determination. To the best of our knowledge, this kind of sensor has never been studied especially in case of non-enzymatic glucose detection. Ti/TiO2 glucose sensor displays a wide practical linear range (1–15 mM) in a pH neutral condition, which cover the typical range in diabetic patients. The selectivity and the limit of detection were 8.3 kΩ·mM−1 and 1.2 mM, respectively. Therefore this kind of a system is very promising candidate for blood glucose sensing which should be able to replace enzymatic glucose sensors. Based on the properties of the prepared sensors, TiO2 is an unrivalled material for glucose sensing comparable with the enzymatic sensors. •Ligand-to-metal charge transfer (LMCT) complex is a new strategy in the glucose sensors development.•Glucose forms the LMCT with TiO2 on the electrode surface.•TiO2 is material for glucose sensors with the comparable selectivity to enzymatic sensors.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114589