Abstract
Here, we report free-standing nanosheets with the thickness of <10 nm (UTNs) formed via only weak π–π interaction and/or van der Waals force. In the work, morphology-controlled synthesis of an α-form perylene crystal are achieved by controlling its growth along the [001] direction in CTAB-assisted liquid-phase chemical reaction (LPCR). UTNs of perylene are prone to forming at low monomer chemical potential (μ) and short aging time, while thicker nanoflakes, even rods, tend to appear at high μ and long aging time due to destroyed CTAB selective adsorption on the (001) plane. Here, UTNs of perylene with thickness of about 1 nm can also be successfully synthesized. To the best of our knowledge, it is the thinnest organic UTNs formed through only weak intermolecular interactions so far. UV–vis absorption spectra show that the size effect of the crystal is closely associated with its orientation and/or shape. The effect of μ and aging time on the size and shape clearly reveals that the mechanism of formation o...
Published Version
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