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Long-Period Optical Fiber Gratings E...

Yang, Fan.

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Long-Period Optical Fiber Gratings Enabled by Functional Polyelectrolyte Coatings for Multi-Parameter Sensing Applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Long-Period Optical Fiber Gratings Enabled by Functional Polyelectrolyte Coatings for Multi-Parameter Sensing Applications./
作者:	Yang, Fan.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	184 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13864001
ISBN:	9781392240342

Long-Period Optical Fiber Gratings Enabled by Functional Polyelectrolyte Coatings for Multi-Parameter Sensing Applications.
Yang, Fan.

Long-Period Optical Fiber Gratings Enabled by Functional Polyelectrolyte Coatings for Multi-Parameter Sensing Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 184 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--Stevens Institute of Technology, 2019.

This item must not be added to any third party search indexes.

Fiber optic sensing technology based on conventional, all-solid optical fiber has proven to be highly sensitive and reliable in chemical and biological sensing and detection. Long-period fiber gratings (LPFG) integrated with stimuli-responsive polyelectrolytes have the potential to further catapult LPFG-based sensing technology in terms of greatly improved sensing capabilities and significantly expanded fields of applications. This doctoral dissertation aims to synergistically integrate LPFG and functional polyelectrolyte coatings as refractive index transduction platform to explore its potential for multi-parameter sensing and measurements. We developed a highly sensitive fiber-optic salinity sensor synergistically combining the ionic-strength-responsive chitosan (CHI)/poly (acrylic acid) (PAA) polyelectrolyte multilayers and the LPFG coupled with LP0,10 cladding mode. The LPFG resonance wavelength underwent a significant blue shift with a sensing response of 36 nm/M from 0.5 to 0.8 M of salt concentrations. This sensitivity is one order of magnitude higher than that obtained using the pristine LPFG. Furthermore, a novel hydrogel was firstly synthesized via layer-by-layer (LbL) electrostatic assembly of partially quaternized poly (4-vinyl pyridine) (qP4VP) and poly (acrylic acid) (PAA), followed by chemical crosslinking. LPFG coated with the hydrogel exhibited a sensitivity of 7 nm RW shift/M (125.5 pm/‰) with a measurement time less than 5 seconds. The shift in the resonance wavelength correlated linearly with salt concentration, making quantification of measured salinity straightforward. In terms of biosensing, An LPFG-based optofluidic platform is developed for the rapid and reliable detection of Staphylococcus aureus at low concentrations. Functional polyelectrolyte coatings were modified to not only significantly increase the initial rate of bacterial adhesion onto the surfaces, but also dramatically improve the sensitivity of LPFG and thus the detection limit for Staphylococcus aureus bacteria. The adhesion kinetics and affinity between bacteria and functional coatings were studied to estimate the initial rate of bacterial adhesion and quantify the capacity of functional coatings for the initial bacterial adhesion. The limit of bacteria detection on antibody-immobilized nanopitted polyelectrolyte coatings was estimated to be 224 CFU/ml based on the linear-log fitting model and the spectral resolution of coated LPFG. The LPFG-based biosensor can be readily adapted to a variety of biophotonic platforms, for applications such as food safety inspection, environmental monitoring, clinical diagnostics, and medical applications.

ISBN: 9781392240342Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Long-period fiber gratings

Long-Period Optical Fiber Gratings Enabled by Functional Polyelectrolyte Coatings for Multi-Parameter Sensing Applications.
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506 $a This item must not be sold to any third party vendors.
520 $a Fiber optic sensing technology based on conventional, all-solid optical fiber has proven to be highly sensitive and reliable in chemical and biological sensing and detection. Long-period fiber gratings (LPFG) integrated with stimuli-responsive polyelectrolytes have the potential to further catapult LPFG-based sensing technology in terms of greatly improved sensing capabilities and significantly expanded fields of applications. This doctoral dissertation aims to synergistically integrate LPFG and functional polyelectrolyte coatings as refractive index transduction platform to explore its potential for multi-parameter sensing and measurements. We developed a highly sensitive fiber-optic salinity sensor synergistically combining the ionic-strength-responsive chitosan (CHI)/poly (acrylic acid) (PAA) polyelectrolyte multilayers and the LPFG coupled with LP0,10 cladding mode. The LPFG resonance wavelength underwent a significant blue shift with a sensing response of 36 nm/M from 0.5 to 0.8 M of salt concentrations. This sensitivity is one order of magnitude higher than that obtained using the pristine LPFG. Furthermore, a novel hydrogel was firstly synthesized via layer-by-layer (LbL) electrostatic assembly of partially quaternized poly (4-vinyl pyridine) (qP4VP) and poly (acrylic acid) (PAA), followed by chemical crosslinking. LPFG coated with the hydrogel exhibited a sensitivity of 7 nm RW shift/M (125.5 pm/‰) with a measurement time less than 5 seconds. The shift in the resonance wavelength correlated linearly with salt concentration, making quantification of measured salinity straightforward. In terms of biosensing, An LPFG-based optofluidic platform is developed for the rapid and reliable detection of Staphylococcus aureus at low concentrations. Functional polyelectrolyte coatings were modified to not only significantly increase the initial rate of bacterial adhesion onto the surfaces, but also dramatically improve the sensitivity of LPFG and thus the detection limit for Staphylococcus aureus bacteria. The adhesion kinetics and affinity between bacteria and functional coatings were studied to estimate the initial rate of bacterial adhesion and quantify the capacity of functional coatings for the initial bacterial adhesion. The limit of bacteria detection on antibody-immobilized nanopitted polyelectrolyte coatings was estimated to be 224 CFU/ml based on the linear-log fitting model and the spectral resolution of coated LPFG. The LPFG-based biosensor can be readily adapted to a variety of biophotonic platforms, for applications such as food safety inspection, environmental monitoring, clinical diagnostics, and medical applications.
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