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Pyridine Vapors Detection by an Optical Fibre Sensor

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.


(a) Summarized deposition process: (1) optical fibre dipping into the vapochromic complex solution, (2) curing at 80°C for 15 minutes, and (3) repeating as many times as layers to be deposited. (b) Zoomed image of a sensor head with 3 layers fixed at 40cm/min. The thickness of the final deposition is 22 μm.
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f2-sensors-08-00847: (a) Summarized deposition process: (1) optical fibre dipping into the vapochromic complex solution, (2) curing at 80°C for 15 minutes, and (3) repeating as many times as layers to be deposited. (b) Zoomed image of a sensor head with 3 layers fixed at 40cm/min. The thickness of the final deposition is 22 μm.

Mentions: By placing the sensor head into an oven at 80°C for 15 minutes, the plastic solution matrix, where the vapochromic material is solved, gets transformed into a robust layer which shows a great adherence to the cleaved ended fibre and a considerable resistance to possible vibrations of the fibre or sharp movements. This process can be repeated as many times as layers to be deposited (figure 2.a). A detail of a sensor head can be observed in figure 2.b.


Pyridine Vapors Detection by an Optical Fibre Sensor
(a) Summarized deposition process: (1) optical fibre dipping into the vapochromic complex solution, (2) curing at 80°C for 15 minutes, and (3) repeating as many times as layers to be deposited. (b) Zoomed image of a sensor head with 3 layers fixed at 40cm/min. The thickness of the final deposition is 22 μm.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3927524&req=5

f2-sensors-08-00847: (a) Summarized deposition process: (1) optical fibre dipping into the vapochromic complex solution, (2) curing at 80°C for 15 minutes, and (3) repeating as many times as layers to be deposited. (b) Zoomed image of a sensor head with 3 layers fixed at 40cm/min. The thickness of the final deposition is 22 μm.
Mentions: By placing the sensor head into an oven at 80°C for 15 minutes, the plastic solution matrix, where the vapochromic material is solved, gets transformed into a robust layer which shows a great adherence to the cleaved ended fibre and a considerable resistance to possible vibrations of the fibre or sharp movements. This process can be repeated as many times as layers to be deposited (figure 2.a). A detail of a sensor head can be observed in figure 2.b.

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.