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Sensors 2008, 8(2), 847-859; doi:10.3390/s8020847
Article

Pyridine Vapors Detection by an Optical Fibre Sensor

1,* , 1
,
1
,
2, 2
,
3
,
3 and 3
1 Department of Electric and Electronic Engineering, Universidad Pública de Navarra, Campus Arrosadía s/n, E-31006 Pamplona, Spain 2 Department of Inorganic Chemistry, Universidad de Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain 3 Department of Analytical Chemistry, Universidad de Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain
* Author to whom correspondence should be addressed.
Received: 26 December 2007 / Accepted: 4 February 2008 / Published: 8 February 2008
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Abstract

An optical fibre sensor has been implemented towards pyridine vapors detection;to achieve this, a novel vapochromic material has been used, which, in solid state, suffers achange in colour from blue to pink-white in presence of pyridine vapours. This complex isadded to a solution of PVC (Poly Vinyl Chloride), TBP (Tributylphosphate) andtetrahydrofuran (THF), forming a plasticized matrix; by dip coating technique, the sensingmaterial is fixed onto a cleaved ended optical fibre. The fabrication process was optimizedin terms of number of dips and dipping speed, evaluating the final devices by dynamicrange. Employing a reflection set up, the absorbance spectra and changes in the reflectedoptical power of the sensors were registered to determine their response. A linear relationbetween optical power versus vapor concentration was obtained, with a detection limit of 1ppm (v/v).
Keywords: Fibre optic sensor; Pyridine vapors sensor; Vapochromic cobalt complex; Dip coating technique Fibre optic sensor; Pyridine vapors sensor; Vapochromic cobalt complex; Dip coating technique
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Elosua, C.; Bariain, C.; Matias, I.R.; Rodriguez, A.; Colacio, E.; Salinas-Castillo, A.; Segura-Carretero, A.; Fernandez-Gutiérrez, A. Pyridine Vapors Detection by an Optical Fibre Sensor. Sensors 2008, 8, 847-859.

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