Abstract

Functional nanowires with photochromic spiropyran (SP) species are prepared by reversible addition–fragmentation transfer (RAFT) dispersion polymerization of styrene using poly(4-vinylpyridine-co-spiropyranyl methacrylate) as a macro-RAFT agent, and then electrospinning technology is used to fabricate fibers from the functional nanowires. The photoisomerization of SP in the nanowires and fibers is studied, and reversible photo­chromism for both nanowires and fibers is observed. Since the merocyanine (ME form) of the SP emits fluorescence and the SP form is non-fluorescent, the fluorescence of the nanowires and the fibers can be switched on and off upon alternating UV and visible-light irradiation.

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