A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection

Accurate detection of trace moisture is critical in various industries, from microelectronics to petrochemicals. While electrical humidity sensors are prevalent, optical methods offer superior sensitivity for low relative humidity (RH) detection, particularly in demanding applications requiring ppb...

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Autores: González Gómez, María, Martínez Medina, Elizabeth, Kovač, Janez, Casals Guillén, Olga, Martínez López, Mònica, Xuriguera Martín, María Elena, Fàbrega Gallego, Cristian
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/224591
Acceso en línea:https://hdl.handle.net/2445/224591
Access Level:acceso abierto
Palabra clave:Ions metàl·lics
Lligands
Colorimetria
Detectors de gasos
Metal ions
Ligands
Colorimetry
Gas detectors
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spelling A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detectionGonzález Gómez, MaríaMartínez Medina, ElizabethKovač, JanezCasals Guillén, OlgaMartínez López, MònicaXuriguera Martín, María ElenaFàbrega Gallego, CristianIons metàl·licsLligandsColorimetriaDetectors de gasosMetal ionsLigandsColorimetryGas detectorsAccurate detection of trace moisture is critical in various industries, from microelectronics to petrochemicals. While electrical humidity sensors are prevalent, optical methods offer superior sensitivity for low relative humidity (RH) detection, particularly in demanding applications requiring ppb sensitivity in harsh environments. This work explores the potential of HKUST-1, a metal-organic framework (MOF), as a colorimetric humidity sensor for ppm level detection across a broad range (0–80 % RH). By spraying HKUST-1 onto polyester substrates and coupling it with a low-cost, commercially available LED-photodiode module, we developed a simple, portable sensing platform. The observed color transitions, from dark blue to turquoise, correlate with the MOF's moisture adsorption mechanism, achieving a detection limit of 18 ppm H2O (< 0.05 % RH). Comprehensive characterization, including interferent gas studies, revealed significant color changes upon exposure to NH3, CO, and ethanol, while CO2, CH4, and N2O showed minimal interference. One-week stability tests demonstrated consistent sensor performance and full reversibility upon exposure to dry air at room temperature. This low-cost, sensitive, and easily fabricated HKUST-1-based sensor offers a promising alternative for humidity monitoring in diverse industrial applications.Elsevier B.V.2025202520252025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion12 p.application/pdfhttps://hdl.handle.net/2445/224591Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1016/j.snb.2025.137973Sensors and Actuators B-Chemical, 2025, vol. 441, 137973https://doi.org/10.1016/j.snb.2025.137973cc-by (c) González Gómez, María et al., 2025http://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2245912026-05-29T05:05:01Z
dc.title.none.fl_str_mv A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
title A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
spellingShingle A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
González Gómez, María
Ions metàl·lics
Lligands
Colorimetria
Detectors de gasos
Metal ions
Ligands
Colorimetry
Gas detectors
title_short A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
title_full A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
title_fullStr A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
title_full_unstemmed A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
title_sort A low-cost colorimetric HKUST-1 sensor for ppm-level humidity detection
dc.creator.none.fl_str_mv González Gómez, María
Martínez Medina, Elizabeth
Kovač, Janez
Casals Guillén, Olga
Martínez López, Mònica
Xuriguera Martín, María Elena
Fàbrega Gallego, Cristian
author González Gómez, María
author_facet González Gómez, María
Martínez Medina, Elizabeth
Kovač, Janez
Casals Guillén, Olga
Martínez López, Mònica
Xuriguera Martín, María Elena
Fàbrega Gallego, Cristian
author_role author
author2 Martínez Medina, Elizabeth
Kovač, Janez
Casals Guillén, Olga
Martínez López, Mònica
Xuriguera Martín, María Elena
Fàbrega Gallego, Cristian
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ions metàl·lics
Lligands
Colorimetria
Detectors de gasos
Metal ions
Ligands
Colorimetry
Gas detectors
topic Ions metàl·lics
Lligands
Colorimetria
Detectors de gasos
Metal ions
Ligands
Colorimetry
Gas detectors
description Accurate detection of trace moisture is critical in various industries, from microelectronics to petrochemicals. While electrical humidity sensors are prevalent, optical methods offer superior sensitivity for low relative humidity (RH) detection, particularly in demanding applications requiring ppb sensitivity in harsh environments. This work explores the potential of HKUST-1, a metal-organic framework (MOF), as a colorimetric humidity sensor for ppm level detection across a broad range (0–80 % RH). By spraying HKUST-1 onto polyester substrates and coupling it with a low-cost, commercially available LED-photodiode module, we developed a simple, portable sensing platform. The observed color transitions, from dark blue to turquoise, correlate with the MOF's moisture adsorption mechanism, achieving a detection limit of 18 ppm H2O (< 0.05 % RH). Comprehensive characterization, including interferent gas studies, revealed significant color changes upon exposure to NH3, CO, and ethanol, while CO2, CH4, and N2O showed minimal interference. One-week stability tests demonstrated consistent sensor performance and full reversibility upon exposure to dry air at room temperature. This low-cost, sensitive, and easily fabricated HKUST-1-based sensor offers a promising alternative for humidity monitoring in diverse industrial applications.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/224591
url https://hdl.handle.net/2445/224591
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.snb.2025.137973
Sensors and Actuators B-Chemical, 2025, vol. 441, 137973
https://doi.org/10.1016/j.snb.2025.137973
dc.rights.none.fl_str_mv cc-by (c) González Gómez, María et al., 2025
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) González Gómez, María et al., 2025
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 12 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404182003318784
score 15,811543

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