New Insight into the Gas-Sensing Properties of CuOx Nanowires by Near-Ambient Pressure XPS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43918294" target="_blank" >RIV/60461373:22340/19:43918294 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/19:10405943 RIV/68378271:_____/19:00539093 RIV/67985891:_____/19:00539093

Result on the web

<a href="https://pubs.acs.org/doi/10.1021/acs.jpcc.9b09124" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.jpcc.9b09124</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.9b09124" target="_blank" >10.1021/acs.jpcc.9b09124</a>

Result language

angličtina

Original language name

New Insight into the Gas-Sensing Properties of CuOx Nanowires by Near-Ambient Pressure XPS

Original language description

This article presents an investigation of the sensing properties of chemiresistors based on Cu2O/CuO core–shell nanowires containing p–p′ heterojunctions. The nanowires were synthesized by a conventional hydrothermal method and used for the detection of ethanol and nitrogen dioxide, reducing and oxidizing agents, respectively. To unravel the chemical processes connected with gas detection, an in situ approach was applied. This approach was based on near-ambient pressure X-ray photoelectron spectroscopy combined with simultaneous monitoring of sensor responses. The in situ measurements were performed during exposure to the analytes at a total pressure of 0.05–1.05 mbar and 450 K and were correlated with chemiresistor response measurements carried out at a standard pressure and under an ambient atmosphere. The study revealed that heterojunction treatment with ethanol vapors, accompanied by partial reduction of the nanowires, is the key step to obtaining chemiresistors with good sensing performance. While the untreated heterojunctions exhibited poor n-type sensing responses, the treated ones showed significantly improved p-type responses. The treated sensors were characterized by a stable baseline, high reversibility, detection limits estimated as 50 ppm for ethanol and 100 ppb for nitrogen dioxide, and with response times in tens of seconds. In all cases, we propose a band scheme of Cu2O/CuO heterojunctions and a gas-sensing mechanism.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Volume of the periodical

123

Issue of the periodical within the volume

49

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

29739-29749

UT code for WoS article

000503114100024

EID of the result in the Scopus database

2-s2.0-85076777815