Hematite nanostructures with well-defined facets and their electrochemical activity towards H₂O₂ and glucose

13^th International Conference on Electrochemistry

May 27-28, 2019 | Barcelona, Spain

Kinga Michalec and Anna Kusior

AGH University of Science and Technology, Poland

Posters & Accepted Abstracts: J Biosens Bioelectron

Abstract :

Glucose biosensors are an essential tool in the fields of health care, chemical, and biological analysis. Classic measuring systems are based on the enzymes �?? glucose oxidase or glucose dehydrogenase. However, these biological catalysts are not sufficiently chemically and thermally stable. Thus, semiconductor materials for nonenzymatic glucose sensors are widely investigated. Hematite (α-Fe2O3) is an inexpensive and biologically inert n-type semiconductor which is chemically stable in aqueous solutions. The physicochemical properties of iron oxides are strongly dependent on their morphology. Thus, more and more attention is being paid to the shape-controlled synthesis of α-Fe2O3 nanomaterials. It has been reported that iron (III) oxide nanostructures with well-defined morphology show excellent catalytic activity towards glucose oxidation. Herein, α-Fe2O3 nanostructures with controlled shape have been investigated as electrode materials in non-enzymatic glucose and hydrogen peroxide sensors. Nanocubes and nanodiscs based on hematite were synthesized via metal-ion mediated hydrothermal route. The morphology of the obtained materials was analysed using scanning electron microscopy. The phase identification was performed by XRD, FTIR and Raman spectroscopy. The optical properties were determined by using UV�??VIS�?? NIR diffuse reflectance spectroscopy. Moreover, zeta-potential measurements have been carried out to analyse the surface properties of the obtained nanomaterials. The detection of glucose and H2O2 in NaOH and PBS solutions was investigated by cyclic voltammetric measurements. Furthermore, the sensitivity and selectivity of the prepared sensors were investigated. The selectivity of the α-Fe2O3 electrodes towards glucose oxidation and hydrogen peroxide reduction was analyzed in the presence of interfering species which are present in the blood such as fructose or ascorbic acid.
Acknowledgment: This work has been supported by the European Union and Ministry of Science and Higher Education, project �??Najlepsi z najlepszych! 3.0�?� POWER cofounded by European Social Fund titled "Transition metal compounds with a designed surface for non-enzymatic glucose sensors.