Publication date: 11th July 2022
We report on a novel concept for the production of two-dimensional organic nanoplateletts, which allows us to design the local surface chemistry. These nanoplateletts are polymer single crystals with a lamellar morphology. Usually, these two-dimensional crystalline nanoplateletts have a homogeneous surface and structuring them is a major challenge. In this study we show the preparation of lamellar polymer crystals having a defined molecular thickness and in addition showing a core-rim architecture. The central area has a different chemical group on the surface than the peripheral area. We achieve this by sequential crystallization driven self assembly of precisely synthesized polymers with different functional groups in the main chain. We demonstrate the resulting structure of the nanoplateletts by means of fluorescent labeling and a selective chemical precipitation reaction at the hydroxyl groups located exclusively at the rim of the plateletts. The resulting polymeric two-dimensional platelets are obtained in a stable dispersion, which simplifies further processing and makes both crystal surfaces accessible for subsequent functionalization. A variety of polymers can be used, which keeps the process and the choice of surface functionalization very flexible. This new concept of designing surface chemistry thus opens up new possibilities in the field of nanotechnology.
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