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• Elosua, C
• Bariain, C
• Matias, IR.
• Rodriguez, A
• Colacio, E
• Salinas-Castillo, A
• Segura-Carretero, A
• Fernandez-Gutiérrez, A
• [+] on Google Scholar
• Elosua, C
• Bariain, C
• Matias, IR.
• Rodriguez, A
• Colacio, E
• Salinas-Castillo, A
• Segura-Carretero, A
• Fernandez-Gutiérrez, A
• [+] on PubMed
• Elosua, C
• Bariain, C
• Matias, IR.
• Rodriguez, A
• Colacio, E
• Salinas-Castillo, A
• Segura-Carretero, A
• Fernandez-Gutiérrez, A

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

Article

Pyridine Vapors Detection by an Optical Fibre Sensor

Cesar Elosua ^1,* , Candido Bariain ¹ , Ignacio R. Matias ¹ , Antonio Rodriguez ² , Enriquie Colacio ² , Alfonso Salinas-Castillo ³ , Antonio Segura-Carretero ³  and Alberto Fernandez-Gutiérrez 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

(This article belongs to the Special Issue Photonic Sensors for Chemical, Biological, and Nuclear Agent Detection)

Download PDF Full-Text [745 KB, uploaded 16 September 2008 11:01 CEST]

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

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