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Selective Methanol Gas Detection Using a U‐Bent Optical Fiber Modified with a Silica Nanoparticle Multilayer
Author(s) -
OKUDA HIROFUMI,
WANG TAO,
LEE SEUNGWOO
Publication year - 2017
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11933
Subject(s) - materials science , nanoporous , nanoparticle , mesoporous silica , methanol , evanescent wave , chemical engineering , silica fiber , thin film , optical fiber , adsorption , fiber , nanotechnology , mesoporous material , optoelectronics , composite material , optics , organic chemistry , chemistry , fiber laser , physics , engineering , catalysis
SUMMARY The development of an evanescent wave optical fiber sensor modified with an organic–inorganic hybrid nanoporous thin film for the detection of organic solvent vapors was demonstrated. The optical fiber with a core diameter of 200 μm was bent into U‐shape to enhance the penetration depth of light transferred into the evanescent field, and modified with a multilayered thin film of poly (allylamine hydrochloride) and silica nanoparticles (PAH/SiO 2 ) n , via layer‐by‐layer (LbL) film deposition. The mesoporous film structure led to higher molecular diffusion and the highest selectivity to methanol among the six alcohols and water, which were used as target analytes, by the aid of tetrakis (4‐sulfophenyl) porphine (TSPP) infused inside the film.