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Synthesis of Ultrathin Nanosheets of Perylene

机译：Per超薄纳米片的合成

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Here, we report free-standing nanosheets with the thickness of <10 nm (UTNs) formed via only weak pi-pi interaction and/or van der Waals force. In the work, morphology-controlled synthesis of an a-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 (mu) and short aging time, while thicker nanoflakes, even rods, tend to appear at high mu 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 mu and aging time on the size and shape clearly reveals that the mechanism of formation of perylene UTNs is a CTAB-induced two-dimensional (2D) nucleation and layer-by-layer growth model, via which a facile path to synthesize UTNs is provided. The work is expected to promote the study and application of 2D nanocrystals of organic semiconductor.
机译：在这里，我们报告了仅通过弱pi-pi相互作用和/或范德华力形成的厚度小于10 nm（UTNs）的自立式纳米片。在这项工作中，通过控制CTAB辅助液相化学反应（LPCR）中沿[001]方向的生长，可以实现a型form晶体的形态控制合成。 ylene的UTN易于在低单体化学势（μ）和较短的老化时间下形成，而较厚的纳米薄片，甚至是棒，由于在（001）面上破坏的CTAB选择性吸附，倾向于在较高的μ和较长的老化时间出现。在此，也可以成功地合成厚度约1nm的per的UTN。据我们所知，它是迄今为止仅通过较弱的分子间相互作用形成的最薄的有机UTN。紫外可见吸收光谱表明，晶体的尺寸效应与其取向和/或形状密切相关。亩和老化时间对尺寸和形状的影响清楚地表明，perUTN的形成机理是CTAB诱导的二维（2D）成核和逐层生长模型，通过该模型可以轻松地合成提供了UTN。预期该工作将促进有机半导体的2D纳米晶体的研究和应用。

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