New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the amb...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-09, Vol.20 (19), p.5602
Main Authors: Piliai, Lesia, Tomeček, David, Hruška, Martin, Khalakhan, Ivan, Nováková, Jaroslava, Fitl, Přemysl, Yatskiv, Roman, Grym, Jan, Vorokhta, Mykhailo, Matolínová, Iva, Vrňata, Martin
Format: Article
Language:English
Subjects:
Acetaldehyde
acetaldehyde pathway
carbon contamination
Discriminant analysis
Ethanol
ethanol-sensing mechanism
Gases
High temperature
Investigations
Lasers
Metal oxides
Microscopy
Morphology
Nanostructured materials
near-ambient pressure XPS
Partial pressure
Photoelectrons
Sensors
Spectrum analysis
X ray photoelectron spectroscopy
Zinc oxide
ZnO nanorods
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Summary:In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O2/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O2/EtOH/H2O and O2/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20195602