Publication detail

Electrical characterization of hydrothermally synthesized manganese dioxide nanowires with regard to NO2 adsorption/desorption thermodynamics

SMÍSITEL, P. ŠIMŮNKOVÁ, H. CHMELA, O. CLAROS VARGAS, M. VALLEJOS VARGAS, S. HUBÁLEK, J.

Original Title

Electrical characterization of hydrothermally synthesized manganese dioxide nanowires with regard to NO2 adsorption/desorption thermodynamics

Type

conference paper

Language

English

Original Abstract

Single nanowires (NWs) are promising structures to improve sensitivity and selectivity of metal-oxide (MOX) gas sensors. Self-made MnO2 nanowires were hydrothermally synthesized and electrically characterized in different ambient. The nanowires were approximately 4-10 µm long and about 100 nm in diameter. The nanowires were suspended in water and deposited on two parallel gold electrodes having separation distance of 4 µm. Single nanowires were aligned perpendicularly across the gold electrodes by dielectrophoresis (DEP) technique. The number of the NWs was determined by scanning electron microscopy. The conductivity was measured in synthetic air, nitrogen, and in NO2 ambient. The tests consisted in measuring resistivity of the NWs in relation to temperature of the bottom-placed heater under the 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. Based on resistivity changes, electrical properties, such as activation energy and a type of semiconductor (p-type in case of MnO2), were evaluated. Mott-Schottky analysis was applied to estimate acceptor concentration, as well as NWs permittivity.

Keywords

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

Authors

SMÍSITEL, P.; ŠIMŮNKOVÁ, H.; CHMELA, O.; CLAROS VARGAS, M.; VALLEJOS VARGAS, S.; HUBÁLEK, J.

Released

18. 9. 2023

Publisher

MDPI

ISBN

2673-4591

Periodical

Engineering Proceedings

Year of study

48

Number

1

State

Swiss Confederation

Pages from

1

Pages to

6

Pages count

6

URL

https://www.mdpi.com/2673-4591/48/1/35

Full text in the Digital Library

http://hdl.handle.net/11012/244168

BibTex

@inproceedings{BUT185059,
  author="Petr {Smísitel} and Helena {Šimůnková} and Ondřej {Chmela} and Martha Carmiňa {Claros Vargas} and Stella {Vallejos Vargas} and Jaromír {Hubálek}",
  title="Electrical characterization of hydrothermally synthesized manganese dioxide nanowires with regard to NO2 adsorption/desorption thermodynamics",
  booktitle="Engineering Proceedings",
  year="2023",
  journal="Engineering Proceedings",
  volume="48",
  number="1",
  pages="1--6",
  publisher="MDPI",
  doi="10.3390/CSAC2023-14883",
  issn="2673-4591",
  url="https://www.mdpi.com/2673-4591/48/1/35"
}