Title :
Polyelectrolyte multilayer nanothin film coated long period grating fiber optic sensors for ammonia gas sensing
Author :
Wang, Tao ; Korposh, S. ; James, Stuart ; Tatam, R. ; Lee, Sang-Won
Author_Institution :
Grad. Sch. of Environ. Eng., Univ. of Kitakyushu, Kitakyushu, Japan
Abstract :
The formation of poly(acrylic acid), PAA, -anchored polyelectrolyte multilayers on an optical fibre long period grating (LPG) by the layer-by-layer (LbL) assembly technique for highly sensitive ammonia gas detection is reported. PAA could act as a receptor for binding of amine compounds, especially ammonia, which would induce changes in the coating properties such as optical thickness (OT), film thickness/density and electrostatic interaction, thus influencing the transmission spectrum of the LPG. The ammonia binding is based on the acid-base interaction to free carboxylic acid groups of PAA. Film morphology and thickness changes due to the binding of ammonia gas, explaining the sensing mechanism, were confirmed through atomic force microscopic (AFM) measurements.
Keywords :
ammonia; atomic force microscopy; diffraction gratings; fibre optic sensors; gas sensors; nanosensors; optical multilayers; optical polymers; polymer electrolytes; thin film sensors; visible spectra; AA-anchored polyelectrolyte multilayer nanothin film; AFM; LPG; LbL assembly; NH3; acid-base interaction; amine compounds; ammonia binding; ammonia gas sensing; atomic force microscopy; coating properties; electrostatic interaction; film density; film morphology; film thickness; free carboxylic acid groups; layer-by-Iayer assembly; long period grating fiber optic sensors; optical fibre long period grating; optical thickness; poly(acrylic acid); transmission spectrum; Gratings; Optical fibers; Optical sensors; Optical variables measurement; Photonics; Plastics; Silicon;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2013 13th IEEE Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-0675-8
DOI :
10.1109/NANO.2013.6720931