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Pyridine Vapors Detection by an Optical Fibre Sensor

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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 a change in colour from blue to pink-white in presence of pyridine vapours. This complex is added to a solution of PVC (Poly Vinyl Chloride), TBP (Tributylphosphate) and tetrahydrofuran (THF), forming a plasticized matrix; by dip coating technique, the sensing material is fixed onto a cleaved ended optical fibre. The fabrication process was optimized in terms of number of dips and dipping speed, evaluating the final devices by dynamic range. Employing a reflection set up, the absorbance spectra and changes in the reflected optical power of the sensors were registered to determine their response. A linear relation between optical power versus vapor concentration was obtained, with a detection limit of 1 ppm (v/v).

No MeSH data available.


(a) Time response of the sensor when exposed to different pyridine vapors concentrations. (b) Linear approximation of the sensor response.
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f8-sensors-08-00847: (a) Time response of the sensor when exposed to different pyridine vapors concentrations. (b) Linear approximation of the sensor response.

Mentions: A 3 layers sensor deposited at a speed of 40cm/min has been exposed to different pyridine vapors concentrations, at a temperature of 25°C and 40% relative humidity. In figure 8.a, the time response of the sensor can be observed for 5 different concentrations: it is clear that the higher concentration, the higher optical power change (as shown in figure 8.a). With these results, a linear approximation relating optical power and vapor concentration can be estimated (see figure 8.b). Analytical performance characteristics were evaluated using the International Union of Pure and Applied Chemistry (IUPAC) method [30] and are summarized in table 3.


Pyridine Vapors Detection by an Optical Fibre Sensor
(a) Time response of the sensor when exposed to different pyridine vapors concentrations. (b) Linear approximation of the sensor response.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3927524&req=5

f8-sensors-08-00847: (a) Time response of the sensor when exposed to different pyridine vapors concentrations. (b) Linear approximation of the sensor response.
Mentions: A 3 layers sensor deposited at a speed of 40cm/min has been exposed to different pyridine vapors concentrations, at a temperature of 25°C and 40% relative humidity. In figure 8.a, the time response of the sensor can be observed for 5 different concentrations: it is clear that the higher concentration, the higher optical power change (as shown in figure 8.a). With these results, a linear approximation relating optical power and vapor concentration can be estimated (see figure 8.b). Analytical performance characteristics were evaluated using the International Union of Pure and Applied Chemistry (IUPAC) method [30] and are summarized in table 3.

View Article: PubMed Central - PubMed

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 a change in colour from blue to pink-white in presence of pyridine vapours. This complex is added to a solution of PVC (Poly Vinyl Chloride), TBP (Tributylphosphate) and tetrahydrofuran (THF), forming a plasticized matrix; by dip coating technique, the sensing material is fixed onto a cleaved ended optical fibre. The fabrication process was optimized in terms of number of dips and dipping speed, evaluating the final devices by dynamic range. Employing a reflection set up, the absorbance spectra and changes in the reflected optical power of the sensors were registered to determine their response. A linear relation between optical power versus vapor concentration was obtained, with a detection limit of 1 ppm (v/v).

No MeSH data available.