ELECTRICAL CHARACTERIZATION OF HYDROTHERMALLY SYNTHESIZED METAL OXIDE NANOWIRES WITH REGARD TO OXYGEN ADSORPTION/DESORPTION THERMODYNAMICS

1 SMISITEL Petr
Co-authors:
2 SIMUNKOVA Helena 1,2 CHMELA Ondrej 3 CLAROS Martha 1,4 VALLEJOS Stella 1,2 HUBALEK Jaromir
Institutions:
1 Central European Institute of Technology (CEITEC), Brno University of Technology, Czech Republic, EU, smisitel@vutbr.cz
2 Department of Microelectronics, Faculty of Electrical Engineering and Communication (FEEC), Brno University of Technology, Czech Republic, EU, simunkova@vutbr.cz
3 Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
4 Instituto de Microelectrónica de Barcelona, IMB-CNM (CSIC), Spain, EU
Conference:
14th International Conference on Nanomaterials - Research & Application, OREA Congress Hotel Brno, Czech Republic, EU, October 19 - 21, 2022
Proceedings:
Proceedings 14th International Conference on Nanomaterials - Research & Application
Pages:
64-70
ISBN:
978-80-88365-09-9
ISSN:
2694-930X
Published:
23rd November 2022
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
338 views / 269 downloads
Abstract

Self-assembled metal oxide MnO2 nanowires (NWs) were hydrothermally synthesized and electrically characterized. The nanowires were from 3 to 10 μm long and from 20 to 100 nm in diameter. The nanowires were suspended in water and deposited on gold interdigitated electrode (IDE) chip using dielectrophoresis (DEP) to align them perpendicularly across the electrodes. Screening of the MnO2 material properties, such as semiconductor type, vacancies concentration and relative permittivity was performed by means of impedance and Mott-Schottky analyses. The conductivity was measured both in synthetic air and in nitrogen ambient. The tests consisted in measuring resistivity of the NWs in relation to temperature of the bottom-placed heater under the IDE chip. The temperature went from room temperature up to 300 °C. The resistivity changes were observed accounting for oxygen reduction on the NWs surface as the electrons were moving from the NWs to the oxygen. The resistivity was explored at a constant current arrangement test. Overall, we observed changes in the electrical properties of the wires upon oxygen adsorption, such as activation energy. Therefore, in future experiments, we might also explore the effect of other gases on the NW’s electrical properties, e.g., ethanol, H2, NO2.

Keywords: MnO2 nanowires, dielectrophoresis, gas sensing, resistivity, Mott-Schottky analysis

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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