Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors

Abstract Colloidal quantum dots (CQDs) have been recently investigated as promising building blocks for low-cost and high-performance gas sensors due to their large effective surface-to-volume ratio and their suitability for versatile functionalization through surface chemistry. In this work we repo...

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Autores principales:	Federica Mitri, Andrea De Iacovo, Massimiliano De Luca, Alessandro Pecora, Lorenzo Colace
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a8f2a25e467b42fea754577b011a3175
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spelling	oai:doaj.org-article:a8f2a25e467b42fea754577b011a31752021-12-02T16:06:39ZLead sulphide colloidal quantum dots for room temperature NO2 gas sensors10.1038/s41598-020-69478-x2045-2322https://doaj.org/article/a8f2a25e467b42fea754577b011a31752020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-69478-xhttps://doaj.org/toc/2045-2322Abstract Colloidal quantum dots (CQDs) have been recently investigated as promising building blocks for low-cost and high-performance gas sensors due to their large effective surface-to-volume ratio and their suitability for versatile functionalization through surface chemistry. In this work we report on lead sulphide CQDs based sensors for room temperature NO2 detection. The sensor response has been measured for different pollutant gases including NO2, CH4, CO and CO2 and for different concentrations in the 2.8–100 ppm range. For the first time, the influence of the QDs film thickness on the sensor response has been investigated and optimized. Upon 30 ppm NO2 release, the best room temperature gas response is about 14 Ω/Ω, with response and recovery time of 12 s and 26 min, respectively. A detection limit of about 0.15 ppb was estimated from the slope of the sensor response and its electric noise. The gas sensors exhibit high sensitivity to NO2, remarkable selectivity, repeatability and full recovery after exposure.Federica MitriAndrea De IacovoMassimiliano De LucaAlessandro PecoraLorenzo ColaceNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Federica Mitri Andrea De Iacovo Massimiliano De Luca Alessandro Pecora Lorenzo Colace Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
description	Abstract Colloidal quantum dots (CQDs) have been recently investigated as promising building blocks for low-cost and high-performance gas sensors due to their large effective surface-to-volume ratio and their suitability for versatile functionalization through surface chemistry. In this work we report on lead sulphide CQDs based sensors for room temperature NO2 detection. The sensor response has been measured for different pollutant gases including NO2, CH4, CO and CO2 and for different concentrations in the 2.8–100 ppm range. For the first time, the influence of the QDs film thickness on the sensor response has been investigated and optimized. Upon 30 ppm NO2 release, the best room temperature gas response is about 14 Ω/Ω, with response and recovery time of 12 s and 26 min, respectively. A detection limit of about 0.15 ppb was estimated from the slope of the sensor response and its electric noise. The gas sensors exhibit high sensitivity to NO2, remarkable selectivity, repeatability and full recovery after exposure.
format	article
author	Federica Mitri Andrea De Iacovo Massimiliano De Luca Alessandro Pecora Lorenzo Colace
author_facet	Federica Mitri Andrea De Iacovo Massimiliano De Luca Alessandro Pecora Lorenzo Colace
author_sort	Federica Mitri
title	Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
title_short	Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
title_full	Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
title_fullStr	Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
title_full_unstemmed	Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors
title_sort	lead sulphide colloidal quantum dots for room temperature no2 gas sensors
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/a8f2a25e467b42fea754577b011a3175
work_keys_str_mv	AT federicamitri leadsulphidecolloidalquantumdotsforroomtemperatureno2gassensors AT andreadeiacovo leadsulphidecolloidalquantumdotsforroomtemperatureno2gassensors AT massimilianodeluca leadsulphidecolloidalquantumdotsforroomtemperatureno2gassensors AT alessandropecora leadsulphidecolloidalquantumdotsforroomtemperatureno2gassensors AT lorenzocolace leadsulphidecolloidalquantumdotsforroomtemperatureno2gassensors
_version_	1718384921971523584

Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors

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