Ultralarge Nanosheets Fabricated by the Hierarchical Self‐Assembly of Porphyrin‐Ended Hyperbranched Poly (ether amine) (TPP–hPEA)

An ultralarge sheet with remarkable lateral dimensions of 10 µm × 10 µm–20 µm × 20 µm is fabricated by the hierarchical self‐assembly of porphyrin‐ended hyperbranched poly(ether amine) (tetraphenylporphyrin (TPP)–hPEA) in solution. The obtained TPP–hPEA amphiphiles can self‐assemble from ultrathin single‐layered nanosheets with a thickness of 4 nm to ultralarge multilayered nanosheets with thicknesses from 30 to 70 nm. The lateral dimensions increase from 2 × 2 µm to 5 × 5 µm, and eventually to 10 × 10 µm. In‐situ dynamic light scattering and UV–vis spectroscopy studies suggest a hierarchical growth self‐assembly mechanism with a self‐assembly process that relies on π–π stacking. This 2D self‐assembly method provides a significant potential guide for the preparation of ultralarge nanosheets in solution.