Publication detail

NAP-XPS study of surface chemistry of CO and ethanol sensing with WO3 nanowires-based gas sensor

PILIAI, L. DINHOVA, T.N. JANATA, M. BALAKIN, D. VALLEJOS, S. OTTA, J. STEFKOVA, J. FISER, L. FITL, P. NOVOTNY, M. HUBALEK, J. VOROCHTA, M. MATOLINOVA, I. VRNATA, M.

Original Title

NAP-XPS study of surface chemistry of CO and ethanol sensing with WO3 nanowires-based gas sensor

Type

journal article in Web of Science

Language

English

Original Abstract

The nanowires prepared on a commercial Al2O3-based sensor platform were studied by near ambient pressure Xray photoelectron spectroscopy (NAP-XPS) upon detecting CO and ethanol. Our findings indicated that the exsitu prepared WO3 NWs-based gas sensor might not be suitable for NAP-XPS studies, as the surfaces tend to accumulate significant carbon contamination, which remains on the surface even after long-term annealing in mbar range oxygen atmosphere at 593 K. To address this challenge, we developed a methodology involving exposure of the sensor to NOx, which effectively cleans the surface and enables the detection of subtle chemical changes upon exposure to various carbon-containing analytes. Using NAP-XPS analysis, we investigated the gas sensing mechanisms of WO3 NWs for CO and ethanol at different temperatures, revealing that it might combine several mechanisms commonly observed in metal-oxide chemiresistors. It is shown that the response to CO rather arises from the quick interaction of CO molecules with the ionosorbed oxygen. In the case of ethanol sensing, the main driving force for the sensor macroscopic electrical response at low temperatures is the adsorption of ethanol molecules. In contrast, at high temperatures, it combines the adsorption of ethoxy groups with the strong reducing effect of EtOH on the WO3 surface.

Keywords

WO 3 nanowires; Gas sensing mechanism; Operando study; Near-ambient pressure XPS

Authors

PILIAI, L.; DINHOVA, T.N.; JANATA, M.; BALAKIN, D.; VALLEJOS, S.; OTTA, J.; STEFKOVA, J.; FISER, L.; FITL, P.; NOVOTNY, M.; HUBALEK, J.; VOROCHTA, M.; MATOLINOVA, I.; VRNATA, M.

Released

15. 12. 2023

Publisher

ELSEVIER SCIENCE SA

Location

LAUSANNE

ISBN

0925-4005

Periodical

Sensors and Actuators B: Chemical

Year of study

397

Number

Prosinec 2023

State

Swiss Confederation

Pages from

1

Pages to

12

Pages count

12

URL

https://pdf.sciencedirectassets.com/271353/1-s2.0-S0925400523X00197/1-s2.0-S0925400523013977/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDgaCXVzLWVhc3QtMSJHMEUCIF0yjbsz%2B39qI3sCrMMpzbGeLRXbq0X%2BUbzWC10BZECFAiEA2i8DHcyMp74xgF3rL5bmJPKKDvMcxkTnzb%2B9zsAKWEIqvAUIoP%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwwNTkwMDM1NDY4NjUiDP4AH3Z5AJDkOF4kpyqQBazWRu00eaFuL7EEeOu2pelYSV7Fafuv%2FYs%2Fj8l7WSvC%2BpqFUNjy2ZsWIskX%2Bu1N1Z2UNfD0sXipFvvmkK%2FjndNU36S2miEYM0yZ8euXBVnpJ7%2FN02ngBMiXWndXR2dYjjhOFhaxnOddCPdKmpt95530aUau7tT

BibTex

@article{BUT185688,
  author="PILIAI, L. and DINHOVA, T.N. and JANATA, M. and BALAKIN, D. and VALLEJOS, S. and OTTA, J. and STEFKOVA, J. and FISER, L. and FITL, P. and NOVOTNY, M. and HUBALEK, J. and VOROCHTA, M. and MATOLINOVA, I. and VRNATA, M.",
  title="NAP-XPS study of surface chemistry of CO and ethanol sensing with WO3 nanowires-based gas sensor",
  journal="Sensors and Actuators B: Chemical",
  year="2023",
  volume="397",
  number="Prosinec 2023",
  pages="1--12",
  doi="10.1016/j.snb.2023.134682",
  issn="0925-4005",
  url="https://pdf.sciencedirectassets.com/271353/1-s2.0-S0925400523X00197/1-s2.0-S0925400523013977/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDgaCXVzLWVhc3QtMSJHMEUCIF0yjbsz%2B39qI3sCrMMpzbGeLRXbq0X%2BUbzWC10BZECFAiEA2i8DHcyMp74xgF3rL5bmJPKKDvMcxkTnzb%2B9zsAKWEIqvAUIoP%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARAFGgwwNTkwMDM1NDY4NjUiDP4AH3Z5AJDkOF4kpyqQBazWRu00eaFuL7EEeOu2pelYSV7Fafuv%2FYs%2Fj8l7WSvC%2BpqFUNjy2ZsWIskX%2Bu1N1Z2UNfD0sXipFvvmkK%2FjndNU36S2miEYM0yZ8euXBVnpJ7%2FN02ngBMiXWndXR2dYjjhOFhaxnOddCPdKmpt95530aUau7tT"
}