This paper reports an efficient method for peeling the surface of crystals using multistep light irradiation with diarylethene crystals. The thin crystals fabricated by this method are only half the thickness of the original crystals, showing the potential for achieving various photomechanical behaviors depending on the irradiation conditions.
Photomechanical materials driven by an external light stimulus have become the focus of much attention. We can operate them in a noncontact way and remotely. Photoinduced bending, one of the typical photomechanical behaviors, is often observed in elongated and thinner crystals, which makes them a promising candidate for a variety of applications. However, the preparation of crystals appropriate for bending behavior is difficult because of the complexity of their molecular structures, preparation conditions, and other factors. Here, an efficient surface peeling of crystals by multistep light irradiation using diarylethene crystals is reported. Thin crystals fabricated by this approach make up less than half the thickness of the original crystals. This shows the potential for the photocontrol of various photomechanical behaviors by the same crystal depending on the irradiation conditions.
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