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Cross-linked poly(vinyl alcohol) (PVA)–silica gel copolymer has been employed as a optical pH sensor substrate for immobilisation of fluorescein. Cross-linking was carried out by the sol–gel process incorporating PVA in initial sol–gel solution of tetra-methoxysilane (TMOS) under acidic conditions. Three dimensional network formation could be achieved using compositions of PVA/TMOS=80–90/20–10vol...
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