Optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water

Sergiy Korposh, Roman Selyanchyn, Wataru Yasukochi, Seung Woo Lee, Stephen W. James, Ralph P. Tatam

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

A fibre optic long period grating (LPG) with an nano-assembled mesoporous coating of alternate layers of poly(diallyldimethylammonium chloride) (PDDA) and SiO 2 nanospheres was used for the development of a highly sensitive fibre-optic chemical sensor. Sensor fabrication involves a 2-stage process: firstly, the deposition of the base mesoporous thin film (PDDA/SiO 2) over an LPG written in the optical fibre using a layer-by layer technique, followed by the infusion of a functional material into the porous film. The refractive index of the base mesoporous coating, determined at a wavelength of 633 nm using ellipsometry, was found to be 1.2. The infusion of the functional material into the coating resulted in a significant change in the RI of the coating, producing a dramatic change in the transmission spectrum of the LPG. The sensing mechanism exploited is based upon chemically induced desorption of the functional material from the mesoporous coating. The sensing of ammonia in aqueous solution was chosen as an example to demonstrate the sensing principle of the LPG sensor. The operation of the sensor was characterized using two functional materials, tetrakis-(4-sulfophenyl)porphine (TSPP) and polyacrylic acid (PAA). The device showed high sensitivity to ammonia with a response time less than 100 s and a limit of detection of 140 ppb when the TSPP infused (PDDA/SiO 2) film was employed as a sensitive element.

Original languageEnglish
Pages (from-to)784-792
Number of pages9
JournalMaterials Chemistry and Physics
Volume133
Issue number2-3
DOIs
Publication statusPublished - Apr 16 2012
Externally publishedYes

Fingerprint

Ammonia
Silicon Dioxide
Functional materials
Optical fibers
ammonia
optical fibers
Silica
gratings
Nanoparticles
silicon dioxide
coatings
Coatings
nanoparticles
Water
carbopol 940
water
sensors
fiber optics
Sensors
Fiber optic chemical sensors

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water. / Korposh, Sergiy; Selyanchyn, Roman; Yasukochi, Wataru; Lee, Seung Woo; James, Stephen W.; Tatam, Ralph P.

In: Materials Chemistry and Physics, Vol. 133, No. 2-3, 16.04.2012, p. 784-792.

Research output: Contribution to journalArticle

Korposh, Sergiy ; Selyanchyn, Roman ; Yasukochi, Wataru ; Lee, Seung Woo ; James, Stephen W. ; Tatam, Ralph P. / Optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water. In: Materials Chemistry and Physics. 2012 ; Vol. 133, No. 2-3. pp. 784-792.
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