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Sensors 2017, 17(11), 2624; doi:10.3390/s17112624

Acoustic Sensors Based on Amino-Functionalized Nanoparticles to Detect Volatile Organic Solvents

1
Centro de Ciencias Aplicadas y Dessarrollo Tecnológico (CCADET), UNAM, 04510 Ciudad de Mexico, Mexico
2
Instituto de Microelectrónica de Barcelona (IMB), CSIC, Campus UAB, 08193 Bellaterra, Spain
3
Instituto de Tecnologías Físicas y de la Información (ITEFI), CSIC, Serrano 144, 28006 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 11 September 2017 / Revised: 24 October 2017 / Accepted: 6 November 2017 / Published: 14 November 2017
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [2445 KB, uploaded 14 November 2017]   |  

Abstract

Love-wave gas sensors based on surface functionalized iron oxide nanoparticles has been developed in this research. Amino-terminated iron oxide nanoparticles were deposited, by a spin coating technique, onto the surface of Love-wave sensors, as a very reproducible gas-sensing layer. The gases tested were organic solvents, such as butanol, isopropanol, toluene and xylene, for a wide and low concentration range, obtaining great responses, fast response times of a few minutes (the time at which the device produced a signal change equal to 90%), good reproducibilities, and different responses for each detected solvent. The estimated limits of detection obtained have been very low for each detected compound, about 1 ppm for butanol, 12 ppm for isopropanol, 3 ppm for toluene and 0.5 ppm for xylene. Therefore, it is demonstrated that this type of acoustic wave sensor, with surface amino-functionalized nanoparticles, is a good alternative to those ones functionalized with metal nanoparticles, which result very expensive sensors to achieve worse results. View Full-Text
Keywords: Love wave; surface acoustic wave; gas sensor; functionalized-nanoparticles; solvent; spin coating Love wave; surface acoustic wave; gas sensor; functionalized-nanoparticles; solvent; spin coating
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Matatagui, D.; Kolokoltsev, O.; Saniger, J.M.; Gràcia, I.; Fernández, M.J.; Fontecha, J.L.; Horrillo, M.C. Acoustic Sensors Based on Amino-Functionalized Nanoparticles to Detect Volatile Organic Solvents. Sensors 2017, 17, 2624.

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