Preparation of hybrid films containing polyoxometalate and fluorescein and their electrochemically induced fluorescence switching behaviors

Abstract

In this study, three hybrid films {[(PEI/P₅W₃₀)_m/(PEI/PSS/PEI/GO@F)]_n(PEI/P₅W₃₀)_m} (m = 1, 3, 5; n = 15, 17, 18) (P₅W₃₀: [P₅W₃₀O₁₁₀]¹⁵⁻; GO: graphene oxide; F: fluorescein) with green fluorescence have been successfully fabricated through a suitable structural design and alternate assembly of selected components. The fluorescence of the hybrid films can be reversibly switched by the electrochromism of the P₅W₃₀ component upon electrochemical modulation while the hybrid films display structural stability against the electrochemical process.