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Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions

The most promising and utilized chemical sensing materials, WO(3) and SnO(2) were characterized by means advanced synchrotron based XPS, UPS, NAP-XPS techniques. The complementary electrical resistance and sensor testing experiments were also completed. A comparison and evaluation of some of the pro...

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Autores principales: Ciftyürek, Engin, Šmíd, Břetislav, Li, Zheshen, Matolín, Vladimír, Schierbaum, Klaus
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6864773/
https://www.ncbi.nlm.nih.gov/pubmed/31683653
http://dx.doi.org/10.3390/s19214737
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author Ciftyürek, Engin
Šmíd, Břetislav
Li, Zheshen
Matolín, Vladimír
Schierbaum, Klaus
author_facet Ciftyürek, Engin
Šmíd, Břetislav
Li, Zheshen
Matolín, Vladimír
Schierbaum, Klaus
author_sort Ciftyürek, Engin
collection PubMed
description The most promising and utilized chemical sensing materials, WO(3) and SnO(2) were characterized by means advanced synchrotron based XPS, UPS, NAP-XPS techniques. The complementary electrical resistance and sensor testing experiments were also completed. A comparison and evaluation of some of the prominent and newly employed spectroscopic characterization techniques for chemical sensors were provided. The chemical nature and oxidation state of the WO(3) and SnO(2) thin films were explored at different depths from imminent surface to a maximum of 1.5 nm depth from the surface with non-destructive depth profiling. The adsorption and amount of chemisorbed oxygen species were precisely analyzed and quantified as a function of temperature between 25–400 °C under realistic operating conditions for chemical sensors employing 1–5 mbar pressures of oxygen (O(2)) and carbon monoxide (CO). The effect of realistic CO and O(2) gas pressures on adsorbed water (H(2)O), OH(−) groups and chemisorbed oxygen species ([Formula: see text]) and chemical stability of metal oxide surfaces were evaluated and quantified.
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spelling pubmed-68647732019-12-06 Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions Ciftyürek, Engin Šmíd, Břetislav Li, Zheshen Matolín, Vladimír Schierbaum, Klaus Sensors (Basel) Article The most promising and utilized chemical sensing materials, WO(3) and SnO(2) were characterized by means advanced synchrotron based XPS, UPS, NAP-XPS techniques. The complementary electrical resistance and sensor testing experiments were also completed. A comparison and evaluation of some of the prominent and newly employed spectroscopic characterization techniques for chemical sensors were provided. The chemical nature and oxidation state of the WO(3) and SnO(2) thin films were explored at different depths from imminent surface to a maximum of 1.5 nm depth from the surface with non-destructive depth profiling. The adsorption and amount of chemisorbed oxygen species were precisely analyzed and quantified as a function of temperature between 25–400 °C under realistic operating conditions for chemical sensors employing 1–5 mbar pressures of oxygen (O(2)) and carbon monoxide (CO). The effect of realistic CO and O(2) gas pressures on adsorbed water (H(2)O), OH(−) groups and chemisorbed oxygen species ([Formula: see text]) and chemical stability of metal oxide surfaces were evaluated and quantified. MDPI 2019-10-31 /pmc/articles/PMC6864773/ /pubmed/31683653 http://dx.doi.org/10.3390/s19214737 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ciftyürek, Engin
Šmíd, Břetislav
Li, Zheshen
Matolín, Vladimír
Schierbaum, Klaus
Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title_full Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title_fullStr Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title_full_unstemmed Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title_short Spectroscopic Understanding of SnO(2) and WO(3) Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions
title_sort spectroscopic understanding of sno(2) and wo(3) metal oxide surfaces with advanced synchrotron based; xps-ups and near ambient pressure (nap) xps surface sensitive techniques for gas sensor applications under operational conditions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6864773/
https://www.ncbi.nlm.nih.gov/pubmed/31683653
http://dx.doi.org/10.3390/s19214737
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