高密度电子激发下石墨烯纳米结构的研究
Nanostructuring Graphene by Dense Electronic Excitation
摘要：
制造定制石墨烯纳米结构的能力是充分利用其巨大技术潜力的关键因素。我们研究了快速重离子诱导折叠在石墨烯中产生的纳米结构。对于我们的实验，单层的石墨烯剥离各种基板和独立的石墨烯已被照射和原子力和高分辨率透射电子显微镜以及拉曼光谱分析。我们表明，密集的电子激发后的穿越离子产生特征的纳米结构，其中每一个可以通过选择适当的照射条件制造。这些纳米结构包括独特的形态，例如具有给定手性的封闭双层边缘或支撑的以及独立的石墨烯内的纳米孔。纳米孔的长度和取向以及因此相关联的闭合双层边缘的长度和取向可以简单地通过入射离子束的方向来控制。在独立式石墨烯中，快速重离子辐照诱导极小的开口，从而提供了以受控方式包覆石墨烯膜的可能性。
英文摘要：
The ability to manufacture tailored graphene nanostructures is a key factor to fully exploit its enormous technological potential. We have investigated nanostructures created in graphene by swift heavy ion induced folding. For our experiments, single layers of graphene exfoliated on various substrates and freestanding graphene have been irradiated and analyzed by atomic force and high resolution transmission electron microscopy as well as Raman spectroscopy. We show that the dense electronic excitation in the wake of the traversing ion yields characteristic nanostructures each of which may be fabricated by choosing the proper irradiation conditions. These nanostructures include unique morphologies such as closed bilayer edges with a given chirality or nanopores within supported as well as freestanding graphene. The length and orientation of the nanopore, and thus of the associated closed bilayer edge, may be simply controlled by the direction of the incoming ion beam. In freestanding graphene, swift heavy ion irradiation induces extremely small openings, offering the possibility to perforate graphene membranes in a controlled way.
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