Optical chemo-sensor based on long period gratings coated with /spl delta/ form syndiotactic polystyrene

Pilla, P.; Iadicicco, Agostino; Contessa, L.; Campopiano, Stefania; Cutolo, A.; Giordano, M.; Guerra, Gaetano; Cusano, A.

doi:10.1109/lpt.2005.851979

Cited by 58 publications

(27 citation statements)

References 8 publications

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“…These nanoporous crystalline forms were found to have the capability to absorb molecules like CO 2 and H 2 [44,45] as well as organic molecules [16,46]. Hence, these materials can be used as sensors, [47][48][49][50] molecular sieves, [46,[51][52][53], catalysts [54], etc.…”

Section: Introductionmentioning

confidence: 99%

Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes

Shaiju

Gowd

2015

Polymer

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Section: Introductionmentioning

confidence: 99%

Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes

Shaiju

Gowd

2015

Polymer

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“…7 A low cost polymer was chosen as hydrophobic overlay, the syndiotactic polystyrene ͑sPS͒ in the delta form demonstrating a refractive index of 1.58. 11,12 Dip coating technique by a controlled and automated system has been chosen as a simple and low cost approach to deposit overlays at nanoscale level along the LPG. 6,7 The optical fiber with the LPG was immersed in a sPS chloroform solution ͑2% by weight͒; different extraction speeds were exploited to obtain different thicknesses.…”

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confidence: 99%

Sensitivity characteristics in nanosized coated long period gratings

Cusano

Iadicicco

Pilla

et al. 2006

Applied Physics Letters

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This work presents an experimental analysis of the sensitivity characteristics to the surrounding refractive index (SRI) in long period gratings coated with polymeric overlay with high refractive index and thickness values ranging in hundreds of nanometers. The presence of the coating induces the cladding to overlay mode transition depending on the overlay features and the SRI. The immediate consequence is a drastic modification of the sensitivity characteristics from the sublinear monotone behavior to a resonantlike shape. Here, the sensitivity characteristics of coated long period gratings have been investigated to outline their dependence on the overlay thickness and order mode.

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“…1,2 Here, in-fiber long-period gratings ͑LPGs͒ were selected as high-sensitivity refractive index transducers and syndiotactic polystyrene ͑sPS͒ in the nanoporous crystalline ␦ form was chosen as sensitive and specific polymeric layer. 3 The potentiality of sPS as highly sensitive and specific material has been recently demonstrated. [4][5][6] The sPS in the semicrystalline ␦ form is characterized by a nanoporous crystalline phase with a regularly spaced array of nanocavities of well-defined size and shape.…”

Section: Giordanomentioning

confidence: 99%

High-sensitivity optical chemosensor based on coated long-period gratings for sub-ppm chemical detection in water

Cusano

Pilla

Contessa

et al. 2005

Applied Physics Letters

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104

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In this work, the use of fiber long-period gratings (LPGs)—coated with nanoscale overlays of Syndiotactic Polystyrene (sPS) in the nanoporous crystalline δ form as specific and highly sensitive chemical sensors for in water monitoring—is proposed. The approach presented here, combines the excellent sorption properties of δ form sPS as a chemosensitive layer with the excellent refractive index sensitivity of LPG-based sensors as ideal transducers. In particular, when overlays with a high refractive index compared with the cladding one are deposited along the grating region, as in this case, the refraction-reflection regime at the cladding-overlay interface occurs. As result of this mechanism, the attenuation bands of coated LPGs would respond to the optical changes induced in the sensitive overlay due to chemical sorption by a significant modification of the peak central wavelength and intensity. The sensitivity depends strongly on the overlay thickness and the grating coupled cladding mode. Here, sensor probes were prepared by using a dip coating technique and a proprietary procedure to obtain the δ form sPS. An experimental demonstration of the sensor capability to perform sub-ppm detection of chloroform in water at room temperature is reported here. Also, the effects of the overlay thickness and the cladding mode order on sensor sensitivity and response time have been numerically and experimentally investigated.

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Optical chemo-sensor based on long period gratings coated with /spl delta/ form syndiotactic polystyrene

Cited by 58 publications

References 8 publications

Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes

Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes

Sensitivity characteristics in nanosized coated long period gratings

High-sensitivity optical chemosensor based on coated long-period gratings for sub-ppm chemical detection in water

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