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Aggregation of atomically precise graphene nanoribbons

机译：原子学精确石墨烯纳米的聚集

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Solution bottom-up approaches can be used to prepare bulk quantities of narrow atomically precise graphene nanoribbons (GNRs) with various widths and geometries. These GNRs are often considered as promising materials for electronic and optoelectronic applications. However, the handling and processing of nanoribbons for practical applications can be difficult because of their entanglement and aggregation, and thus poor solubility in conventional solvents. In this work, we studied the aggregation-dependent properties of solution-synthesized chevron GNRs in a variety of solvents. We demonstrate that the spectroscopic features observed in the experimentally measured absorbance spectra of chevron GNRs are in a good agreement with the theoretically predicted excitionic transitions. We also show that the absorbance spectra of GNRs evolve with aggregation time, which is important to consider for the spectroscopic determination of optical bandgaps of nanoribbons. We discuss two types of GNR assemblies: bulk aggregates of pi-pi stacked nanoribbons that form in a solution and rather long one-dimensional (1D) structures that were observed on a variety of surfaces, such as Au(111), mica and Si/SiO2. We demonstrate that the few-mu m-long 1D GNR structures can be conveniently visualized by conventional microscopy techniques and used for the fabrication of electronic devices.
机译：溶液自下而上的方法可用于制备具有各种宽度和几何形状的窄原子精确石墨烯纳米纳米杆（GNR）的大量。这些GNR通常被认为是用于电子和光电应用的有希望的材料。然而，由于其缠结和聚集，因此纳米波巴的处理和加工可能是困难的，因此在常规溶剂中溶解性差。在这项工作中，我们研究了各种溶剂中溶液合成的雪佛龙GNR的聚集依赖性。我们证明，在Vegron GNR的实验测量的吸光光谱中观察到的光谱特征与理论上预测的原始转变吻合良好。我们还表明，GNR的吸光度光谱与聚集时间发展，这对于考虑纳米波巴光学带盖的光谱测定是重要的。我们讨论两种类型的GNR组件：在溶液中形成的PI-PI堆叠纳米块的块状聚集体，其在各种表面上观察到的溶液中，而是在诸如Au（111），云母和Si的各种表面上观察到的一维（1D）结构。 / SiO2。我们证明几-MU M-LONG 1D GNR结构可以通过传统的显微镜技术方便地可视化并用于制造电子器件。

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