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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F23%3APU149814" target="_blank" >RIV/00216305:26220/23:PU149814 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/23:10476010 RIV/60461373:22340/23:43928270

Výsledek na webu

<a href="https://pdf.sciencedirectassets.com/271353/1-s2.0-S0925400523X00197/1-s2.0-S0925400523013977/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDgaCXVzLWVhc3QtMSJHMEUCIF0yjbsz%2B39qI3sCrMMpzbGeLRXbq0X%2BUbzWC10BZECFAiEA2i8DHcyMp74xgF3rL5bmJPKKDvMcxkTnzb%2B9z" target="_blank" >https://pdf.sciencedirectassets.com/271353/1-s2.0-S0925400523X00197/1-s2.0-S0925400523013977/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEDgaCXVzLWVhc3QtMSJHMEUCIF0yjbsz%2B39qI3sCrMMpzbGeLRXbq0X%2BUbzWC10BZECFAiEA2i8DHcyMp74xgF3rL5bmJPKKDvMcxkTnzb%2B9z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.snb.2023.134682" target="_blank" >10.1016/j.snb.2023.134682</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10400 - Chemical sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Sensors and Actuators B: Chemical

ISSN

0925-4005

e-ISSN

—

Svazek periodika

397

Číslo periodika v rámci svazku

Prosinec 2023

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

001097595200001

EID výsledku v databázi Scopus

2-s2.0-85172767941