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Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow

Measuring humidity in dynamic situations calls for highly sensitive fast response sensors. Here we report, a humidity sensor fabricated using solution processed supramolecular nanofibres as active resistive sensing material. The nanofibres are built via self- assembly of donor and acceptor molecules...

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Autores principales: Mogera, Umesha, Sagade, Abhay A., George, Subi J., Kulkarni, Giridhar U.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3925946/
https://www.ncbi.nlm.nih.gov/pubmed/24531132
http://dx.doi.org/10.1038/srep04103
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author Mogera, Umesha
Sagade, Abhay A.
George, Subi J.
Kulkarni, Giridhar U.
author_facet Mogera, Umesha
Sagade, Abhay A.
George, Subi J.
Kulkarni, Giridhar U.
author_sort Mogera, Umesha
collection PubMed
description Measuring humidity in dynamic situations calls for highly sensitive fast response sensors. Here we report, a humidity sensor fabricated using solution processed supramolecular nanofibres as active resistive sensing material. The nanofibres are built via self- assembly of donor and acceptor molecules (coronene tetracarboxylate and dodecyl methyl viologen respectively) involved in charge transfer interactions. The conductivity of the nanofibre varied sensitively over a wide range of relative humidity (RH) with unprecedented fast response and recovery times. Based on UV-vis, XRD and AFM measurements, it is found that the stacking distance in the nanofibre decreases slightly while the charge transfer band intensity increases, all observations implying enhanced charge transfer interaction and hence the conductivity. It is demonstrated to be as a novel breath sensor which can monitor the respiration rate. Using two humidity sensors, a breath flow sensor was made which could simultaneously measure RH and flow rate of exhaled nasal breath. The integrated device was used for monitoring RH in the exhaled breath from volunteers undergoing exercise and alcohol induced dehydration.
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spelling pubmed-39259462014-03-05 Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow Mogera, Umesha Sagade, Abhay A. George, Subi J. Kulkarni, Giridhar U. Sci Rep Article Measuring humidity in dynamic situations calls for highly sensitive fast response sensors. Here we report, a humidity sensor fabricated using solution processed supramolecular nanofibres as active resistive sensing material. The nanofibres are built via self- assembly of donor and acceptor molecules (coronene tetracarboxylate and dodecyl methyl viologen respectively) involved in charge transfer interactions. The conductivity of the nanofibre varied sensitively over a wide range of relative humidity (RH) with unprecedented fast response and recovery times. Based on UV-vis, XRD and AFM measurements, it is found that the stacking distance in the nanofibre decreases slightly while the charge transfer band intensity increases, all observations implying enhanced charge transfer interaction and hence the conductivity. It is demonstrated to be as a novel breath sensor which can monitor the respiration rate. Using two humidity sensors, a breath flow sensor was made which could simultaneously measure RH and flow rate of exhaled nasal breath. The integrated device was used for monitoring RH in the exhaled breath from volunteers undergoing exercise and alcohol induced dehydration. Nature Publishing Group 2014-02-17 /pmc/articles/PMC3925946/ /pubmed/24531132 http://dx.doi.org/10.1038/srep04103 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Mogera, Umesha
Sagade, Abhay A.
George, Subi J.
Kulkarni, Giridhar U.
Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title_full Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title_fullStr Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title_full_unstemmed Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title_short Ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
title_sort ultrafast response humidity sensor using supramolecular nanofibre and its application in monitoring breath humidity and flow
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3925946/
https://www.ncbi.nlm.nih.gov/pubmed/24531132
http://dx.doi.org/10.1038/srep04103
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