SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 55: Organic Molecules on Inorganic Substrates IV: Adsorption and Growth II
O 55.2: Talk
Wednesday, March 29, 2023, 15:15–15:30, CHE 91
Sensing properties of cerium oxide as an electrode material for the detection of glucose — •Anastasiia Deineko1, Viacheslav Kalinovych1, Sascha L. Mehl2, Yevheniia Lobko1, Yurii Yakovlev1, Tomáš Skála1, Kevin C. Prince2, Vladimír Matolín1, Iva Matolínová1, and Nataliya Tsud1 — 1Charles University, Faculty of Mathematics and Physics, Department of Surface and Plasma Science, Prague, Czech Republic — 2Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy
Detection of glucose level in biological liquids is of great importance nowadays because of the growing number of people with diabetes. A variety of oxides is used as electrode material for biosensors and cerium oxide is among them due to its unique properties. In this study characterization of the cerium oxide was performed by surface analysis techniques using photoelectron and absorption spectroscopies (XPS, SRPES, RPES, NEXAFS) in combination with electrochemical measurements. Photoemission based analysis provided information on changes in the oxidation state of cerium cations on the surface and in the subsurface layers of the oxide film, and whether glucose chemically bonds to the oxide. While electrochemical testing, namely cyclic voltammetry and chronoamperometry, was used to explore the sensing properties of polycrystalline cerium oxide films in reaction with glucose in the PBS working solution. The CeO2 working electrode sensitivity and pH range of sensor stability were determined and discussed in view of the enzymatic properties of cerium oxide. Keywords: cerium oxide, glucose, photoelectron spectroscopy, electrochemistry, biosensor.