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. 2016 Aug 17;2(9):598–603. doi: 10.1021/acscentsci.6b00198

Figure 2.

Figure 2

Characterization of TPE fluorescence. (a) UV–vis absorption (6.6 × 10–5 M in hexyl acetate) and solid-state fluorescence emission spectra of TPE (λex = 365 nm). (b) Photographs of a TPE solution under illumination with UV light demonstrating the development of fluorescence upon solvent evaporation. (c) Stereomicrographs of TPE microcapsules under illumination with white light and UV light demonstrating damage-induced fluorescence. Intact microcapsules are undetectable under UV light, while ruptured microcapsules are fluorescent. The locations of intact microcapsules are outlined as a guide (red dashed circles). (d) SEM images of a ruptured TPE microcapsule showing formation of TPE crystals on the shell wall.