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Sensors 2017, 17(9), 2039; doi:10.3390/s17092039

Tapered Optical Fiber Functionalized with Palladium Nanoparticles by Drop Casting and Laser Radiation for H2 and Volatile Organic Compounds Sensing Purposes

1
Grupo de Sistemas Fotónicos y Nanoóptica, Facultad de Ciencias de la Electrónica, Benemérita Universidad Autónoma de Puebla, CP 72570 Puebla, Pue., Mexico
2
Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, CP 72050 Puebla, Pue., Mexico
*
Author to whom correspondence should be addressed.
Received: 18 July 2017 / Revised: 13 August 2017 / Accepted: 29 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Air Pollution Sensors: A New Class of Tools to Measure Air Quality)
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Abstract

A comparative study on the sensing properties of a tapered optical fiber pristine and functionalized with the palladium nanoparticles to hydrogen and volatile organic compounds (VOCs), is presented. The sensor response and, response/recovery times were extracted from the measurements of the transient response of the device. The tapered optical fiber sensor was fabricated using a single-mode optical fiber by the flame-brushing technique. Functionalization of the optical fiber was performed using an aqueous solution of palladium chloride by drop-casting technique assisted for laser radiation. The detection principle of the sensor is based on the changes in the optical properties of palladium nanoparticles when exposed to reducing gases, which causes a variation in the absorption of evanescent waves. A continuous wave laser diode operating at 1550 nm is used for the sensor characterization. The sensor functionalized with palladium nanoparticles by this technique is viable for the sensing of hydrogen and VOCs, since it shows an enhancement in sensor response and response time compared to the sensor based on the pristine optical microfiber. The results show that the fabricated sensor is competitive with other fiber optic sensors functionalized with palladium nanoparticles to the hydrogen. View Full-Text
Keywords: Tapered optical fiber; functionalized; palladium nanoparticles Tapered optical fiber; functionalized; palladium nanoparticles
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González-Sierra, N.E.; Gómez-Pavón, L.C.; Pérez-Sánchez, G.F.; Luis-Ramos, A.; Zaca-Morán, P.; Muñoz-Pacheco, J.M.; Chávez-Ramírez, F. Tapered Optical Fiber Functionalized with Palladium Nanoparticles by Drop Casting and Laser Radiation for H2 and Volatile Organic Compounds Sensing Purposes. Sensors 2017, 17, 2039.

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