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Fluorescence turn‐on chemical sensor based on water‐soluble conjugated polymer/single‐walled carbon nanotube composite
Author(s) -
Adachi Naoya,
Okada Mari,
Sugeno Masafumi,
Norioka Takayuki
Publication year - 2016
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.43301
Subject(s) - carbon nanotube , composite number , materials science , aqueous solution , polymer , conjugated system , fluorescence , random coil , sulfonic acid , chemical engineering , nanocomposite , sonogashira coupling , composite material , polymer chemistry , chemistry , organic chemistry , circular dichroism , crystallography , catalysis , palladium , physics , engineering , quantum mechanics
A chemical sensor for methyl viologen (MV 2+ ), based on a water‐soluble conjugated polymer/single‐walled carbon‐nanotube (SWNT) composite, was fabricated. Water‐soluble poly( m ‐phenylene ethynylene) with sulfonic acid side‐chain groups ( m PPE‐SO 3 ) was synthesized via a Pd‐catalyzed Sonogashira coupling reaction and used to prepare a highly stable m PPE‐SO 3 /SWNT composite with strong π–π interactions in water. The relationship between the optical properties and sensing capability of the m PPE‐SO 3 /SWNT composite in aqueous solution was investigated. The addition of MV 2+ enhanced the fluorescence intensity of the m PPE‐SO 3 /SWNT composite by inducing a conformational change of the polymer from a helical to a random‐coil structure. The water‐soluble m PPE‐SO 3 /SWNT composite enabled highly sensitive fluorescence detection of MV 2+ in aqueous solutions with no precipitation resulting from reaggregation of the SWNTs. This m PPE‐SO 3 /SWNT composite sensor system is therefore an effective turn‐on chemical sensor for MV 2+ . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43301.