Nanostructuring graphene by dense electronic excitation
Nanostructuring graphene by dense electronic excitation
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DOI：
10.1088/0957-4484/26/46/465302
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发表时间：
2015-11-20
期刊：
影响因子：
3.5
通讯作者：
Schleberger, M.
中科院分区：
文献类型：
--
作者：
Ochedowski, O.;Lehtinen, O.;Schleberger, M.
制造定制的石墨烯纳米结构的能力是充分开发其巨大技术潜力的关键因素。我们研究了通过快速重离子诱导折叠在石墨烯中创建的纳米结构。在我们的实验中，我们对在不同衬底上剥离的单层石墨烯和独立的石墨烯进行了辐照，并用原子力和高分辨率电子显微镜以及拉曼光谱进行了分析。我们发现，在穿过离子后产生的密集电子激发产生了特征纳米结构，每种结构都可以通过选择合适的辐照条件来制备。这些纳米结构包括独特的形态，如具有给定手性的闭合双层边缘或支撑和独立的石墨烯中的纳米孔。纳米孔的长度和取向，以及相关的闭合双层边的长度和取向，可以简单地由入射离子束的方向控制。在独立的石墨烯中，快速的重离子辐照会导致极小的开口，从而有可能以受控的方式穿透石墨烯膜。
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.