SYNTHESIS OF ZINC, COBALT AND COPPER HYDROXY-CARBONATES FOR CREATION OF ELECTROCHEMICAL NON-ENZYMATIC GLUCOSE SENSOR

Abstract

Non-enzymatic glucose sensors are promising for reusable electrochemical test systems because of their high sensitivity, fast response and ease of operation. A wide class of materials such as noble metal nanoparticles, composites based on carbon nanomaterials, and metal oxides are used to create non-enzymatic glucose sensors. The search for new materials for the creation of highly sensitive glucose sensors is an urgent task. In the present work a new sensor material promising for the creation of glucose biosensors is investigated. Zinc, cobalt and copper hydroxy-carbonates were synthesized by hydrothermal method at 120 oC and characterized by scanning electron microscopy, X-ray diffraction analysis, Raman spectroscopy and electrochemical methods. It is shown that the synthesized material exhibits high sensitivity to glucose (11.2 mA*mM-1*cm-2), wide sensitivity range, thermal stability and is promising for the development of non-enzymatic glucose biosensors. The limit of detection, evaluated by the magnitude of the electrochemical response when the glucose concentration was varied within the interval up to 0.5 mM, was 0.007 mM. The obtained material showed thermal stability up to 200 oC when heated in an oxidizing atmosphere, which is important for ensuring long-term stability of sensory characteristics.