Plastic optical fibres modified with a triblock polyion complexed multibilayer containing a poly(methacrylic acid) segment gave a pH-induced optical signal change, resulting from the alternation in refractive index, derived from the conformational transition of the polymer segment.
M. Niwa, T. Yamamoto and N. Higashi, J. Chem. Soc., Chem. Commun., 1991, 444 DOI: 10.1039/C39910000444
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