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Updated: Jul 8, 2026

Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography

Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography

Published on: September 5, 2012

Nb₂O₅ Microcolumns for Ethanol Sensing.

Gayan W C Kumarage^1,2, Shasika A Panamaldeniya^3,4, Valentin A Maraloiu⁵

¹SENSOR Laboratory, Department of Information Engineering, University of Brescia, Via Valotti 9, 25133 Brescia, Italy.

Sensors (Basel, Switzerland)

|March 28, 2024

Summary

Synthesized pseudohexagonal niobium oxide (Nb2O5) microcolumns for gas sensors. These sensors show high selectivity and humidity resistance for ethanol detection at 500 °C.

Keywords:

Nb2O5 ethanol sensor gas sensors microcolums: MOX

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Niobium oxide (Nb2O5) is a promising material for gas sensing applications.
Developing cost-effective synthesis methods for nanostructured Nb2O5 is crucial.
Gas sensors require high selectivity, sensitivity, and stability under various conditions.

Purpose of the Study:

To synthesize pseudohexagonal Nb2O5 microcolumns using a hydrothermal method.
To fabricate and characterize conductometry sensors based on Nb2O5 microcolumns.
To evaluate the gas sensing performance of Nb2O5 sensors for ethanol detection.

Main Methods:

Hydrothermal synthesis of Nb2O5 microcolumns at 180 °C for 30 min, followed by calcination at 500 °C.
Characterization using Raman spectroscopy and High-Resolution Transmission Electron Microscopy (HRTEM).
Fabrication of conductometry sensors by drop-casting Nb2O5 microcolumns on Pt electrodes.

Main Results:

Raman spectroscopy confirmed the pseudohexagonal Nb2O5 structure with characteristic peaks.
HRTEM revealed specific inter-lattice distances.
Sensors demonstrated excellent selectivity for ethanol (C2H5OH) with a response of ΔG/G = 2.51 for 10 ppm.
Optimal operating temperature was 500 °C in dry air.
Sensors exhibited high repeatability and strong humidity resistance (up to 90% RH).

Conclusions:

Cost-effective hydrothermal synthesis yields pseudohexagonal Nb2O5 microcolumns suitable for gas sensing.
Nb2O5 microcolumn-based sensors offer excellent selectivity and stability for ethanol detection.
The nanoporous structure and high operating temperature contribute to the sensors' humidity resistance and overall performance.