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Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films
Regarding the use of hydrogen as a fuel, it is necessary to measure its concentration in air at room temperature. In this paper, sensitive composite films have been developed for surface acoustic wave (SAW) sensors, using quantum dots (QDs) and polymers. Si/SiO(2) QDs were used due to having a high...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832898/ https://www.ncbi.nlm.nih.gov/pubmed/31623102 http://dx.doi.org/10.3390/s19204481 |
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author | Constantinoiu, Izabela Viespe, Cristian |
author_facet | Constantinoiu, Izabela Viespe, Cristian |
author_sort | Constantinoiu, Izabela |
collection | PubMed |
description | Regarding the use of hydrogen as a fuel, it is necessary to measure its concentration in air at room temperature. In this paper, sensitive composite films have been developed for surface acoustic wave (SAW) sensors, using quantum dots (QDs) and polymers. Si/SiO(2) QDs were used due to having a high specific surface area, which considerably improves the sensitivity of the sensors compared to those that only have a polymer. Si/SiO(2) QDs were obtained by laser ablation and analyzed by X-ray diffraction and transmission electron microscopy (TEM). Two types of polymers were used: polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA). Polymer and polymer with QDs compositions were deposited on the sensor substrate by drop casting. A heat treatment was performed on the films at 80 °C with a thermal dwell of two hours. The sensors obtained were tested at different hydrogen concentrations at room temperature. A limit of detection (LOD) of 452 ppm was obtained by the sensor with PDMS and Si/SiO(2) QDs, which was heat treated. The results demonstrated the potential of using QDs to improve the sensitivity of the SAW sensors and to achieve a heat treatment that increases its adsorption capacity of the gas molecules. |
format | Online Article Text |
id | pubmed-6832898 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-68328982019-11-25 Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films Constantinoiu, Izabela Viespe, Cristian Sensors (Basel) Article Regarding the use of hydrogen as a fuel, it is necessary to measure its concentration in air at room temperature. In this paper, sensitive composite films have been developed for surface acoustic wave (SAW) sensors, using quantum dots (QDs) and polymers. Si/SiO(2) QDs were used due to having a high specific surface area, which considerably improves the sensitivity of the sensors compared to those that only have a polymer. Si/SiO(2) QDs were obtained by laser ablation and analyzed by X-ray diffraction and transmission electron microscopy (TEM). Two types of polymers were used: polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA). Polymer and polymer with QDs compositions were deposited on the sensor substrate by drop casting. A heat treatment was performed on the films at 80 °C with a thermal dwell of two hours. The sensors obtained were tested at different hydrogen concentrations at room temperature. A limit of detection (LOD) of 452 ppm was obtained by the sensor with PDMS and Si/SiO(2) QDs, which was heat treated. The results demonstrated the potential of using QDs to improve the sensitivity of the SAW sensors and to achieve a heat treatment that increases its adsorption capacity of the gas molecules. MDPI 2019-10-16 /pmc/articles/PMC6832898/ /pubmed/31623102 http://dx.doi.org/10.3390/s19204481 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Constantinoiu, Izabela Viespe, Cristian Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title | Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title_full | Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title_fullStr | Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title_full_unstemmed | Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title_short | Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films |
title_sort | hydrogen detection with saw polymer/quantum dots sensitive films |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832898/ https://www.ncbi.nlm.nih.gov/pubmed/31623102 http://dx.doi.org/10.3390/s19204481 |
work_keys_str_mv | AT constantinoiuizabela hydrogendetectionwithsawpolymerquantumdotssensitivefilms AT viespecristian hydrogendetectionwithsawpolymerquantumdotssensitivefilms |