Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films
National Institute for Laser, Plasma and Radiation Physics, Laser Department, Atomistilor #409, 077125 Bucharest-Magurele, Romania
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Sensors 2019, 19(20), 4481; https://doi.org/10.3390/s19204481
Received: 11 September 2019
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Revised: 9 October 2019
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Accepted: 15 October 2019
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Published: 16 October 2019
(This article belongs to the Special Issue Polymers Based Sensors)
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/SiO2 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/SiO2 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/SiO2 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.
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Keywords:
gas sensor; composite; surface acoustic wave; quantum dots; polymer; hydrogen sensor; SAW sensor; gas detection
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MDPI and ACS Style
Constantinoiu, I.; Viespe, C. Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films. Sensors 2019, 19, 4481. https://doi.org/10.3390/s19204481
AMA Style
Constantinoiu I, Viespe C. Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films. Sensors. 2019; 19(20):4481. https://doi.org/10.3390/s19204481
Chicago/Turabian StyleConstantinoiu, Izabela, and Cristian Viespe. 2019. "Hydrogen Detection with SAW Polymer/Quantum Dots Sensitive Films" Sensors 19, no. 20: 4481. https://doi.org/10.3390/s19204481
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