Adhesion-driven site-specific fabrication of multifunctional melanin-like pigment
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Polycatecholic materials such as polydopamine and polynorepinephrine have emerged due to their versatile adhesion to a variety of surfaces. In addition to their adhesive properties, they have also been known as synthetic versions of melanin that possess a broad range light absorption from ultraviolet (UV) to near-infrared (NIR) region. These contribute to multifunctionalities such as harmful UV protection and photothermal conversion. However, the site-specific fabrication and/or patterning of polycatecholic materials is currently only available through lithographic techniques because they attach to all surfaces exposed to catecholic precursors. Herein, we report a novel method for the site-specific fabrication of polycatecholic materials on a desired surface by conversely employing the versatile adhesive properties of them. This allows preparation of multifunctional two- and three-dimensional surfaces for biomedical applications.