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首页> 外文期刊>Advanced Materials >Turning PMMA Nanofibers into Graphene Nanoribbons by In Situ Electron Beam Irradiation
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Turning PMMA Nanofibers into Graphene Nanoribbons by In Situ Electron Beam Irradiation

机译：通过原位电子束辐照将PMMA纳米纤维转变为石墨烯纳米带

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摘要

Much of the discussion of the future prospects of nano-technology is currently centered around carbon-based nanos-tructures, including fullerenes, nanofibers, nanotubes, and graphenes. In the past 10-20 years, fullerenes and nanotubes have attracted a great deal of attention because of their special properties, however, they are still far from finding large-scale application in nanoelectronics because it is hard to precisely control their diameter, position, and conductive type. Recently, graphene has become a new rising star on the horizon of materials science and condensed-matter physics. It is a perfect two-dimensional (2D) material, which is of interest for both theoretical research and electronic applications. Its combined properties of ballistic transport at room temperature with chemical and mechanical stability make it a promising candidate for nanoelectronics. These remarkable properties can also extend to bilayer and few-layer graphenes. Until now, graphenes have been fabricated by micromechanical cleavage of bulk graphite, epitaxial growth on metal substrates by chemical vapor deposition (CVD), and thermal decomposition of silicon carbide (SiC). Compared to carbon nanotubes, graphenes are comparatively easy to fabricate and manipulate in a designed and controlled way. Considering the abilities of large-scale fabrication and high integration, bilayer or few-layer graphenes with narrow width are more realistic for applications. However, although graphenes can be obtained by the three abovementioned methods, the fabrication of graphenes is still in its relative infancy and there is much to be learnt about how to control the number of layers and the width of the graphene. In this Communication, we report a method of preparing graphene nanoribbons in a fine-tuned way by in situ electron beam irradiation of ultrathin poly(methyl methacrylate) (PMMA) nanofibers. We chose PMMA as the irradiation material because it is a standard high-resolution electron resist.
机译：当前，关于纳米技术未来前景的许多讨论都围绕碳基纳米结构，包括富勒烯，纳米纤维，纳米管和石墨烯。在过去的10到20年中，富勒烯和纳米管由于其特殊的性能而引起了广泛的关注，但是，由于难以精确控制它们的直径，位置，和导电类型。最近，石墨烯已成为材料科学和凝聚态物理领域新出现的后起之秀。它是一种完美的二维（2D）材料，理论研究和电子应用都对此感兴趣。它在室温下具有良好的弹道传输性能以及化学和机械稳定性，使其成为纳米电子学的有希望的候选者。这些卓越的性能还可以扩展到双层和几层石墨烯。到目前为止，石墨烯是通过块状石墨的微机械切割，通过化学气相沉积（CVD）在金属基底上外延生长以及碳化硅（SiC）的热分解来制造的。与碳纳米管相比，石墨烯相对容易设计和控制。考虑到大规模制造和高集成度的能力，具有较窄宽度的双层或几层石墨烯对于应用更为现实。然而，尽管可以通过上述三种方法获得石墨烯，但是石墨烯的制造仍处于起步阶段，关于如何控制石墨烯的层数和宽度还有很多要学习的知识。在本通讯中，我们报告了一种通过超薄聚甲基丙烯酸甲酯（PMMA）纳米纤维的原位电子束辐照以微调的方式制备石墨烯纳米带的方法。我们选择PMMA作为辐照材料，因为它是标准的高分辨率电子抗蚀剂。

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