Graphene and Hexagonal Boron Nitride Layers: Nanostructures with 3 bond hierarchy levels
Graphene and Hexagonal Boron Nitride Layers: Nanostructures with 3 bond hierarchy levels
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DOI：
10.1380/ejssnt.2010.62
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发表时间：
2010-02
影响因子：
0.7
通讯作者：
T. Greber
中科院分区：
文献类型：
--
作者：
T. Greber
单层碳（石墨烯）和六方氮化硼可以生长在过渡金属表面上。衬底起到支撑的作用，并且由于其催化活性而允许通过化学气相沉积生长完美的层。这些层是sp2杂化蜂窝网络，具有与基底和吸附物的强的平面内σ-和弱的平面外π-键。这种粘结强度的层次结构导致各向异性弹性特性，其中sp2层在平面内是刚性的，而在平面外是柔性的。这些层中的一部分在键能（α键）中施加了第三层次，分子物体的横向键合尺寸在1到5纳米之间。由于吸附物的极化率α，横向额外键能在室温下的热能kTR范围内，并且对于纳米技术特别感兴趣。将讨论伴随的模板函数。特殊的键级结构也使插层成为sp2层系统的另一个性质。最后但并非最不重要的是，sp2层系统特别坚固，即浸入液体中也能存活，这是sp2层在超高真空之外有用的前景。[DOI：10.1380/ejssnt.2010.62]
Single layers of carbon (graphene) and hexagonal boron nitride may be grown on transition metal surfaces. The substrates take the role of the support and allow due to their catalytic activity the growth of perfect layers by chemical vapor deposition. The layers are sp2 hybridized honeycomb networks with strong in plane σ- and weaker out of plane π-bonds to the substrate and to the adsorbates. This hierarchy in bond strength causes anisotropic elastic properties, where the sp2 layers are stiff in plane and soft out of plane. A corrugation of these layers imposes a third hierarchy level in bond energies (α-bonds), with lateral bonding of molecular objects with sizes between 1 and 5 nanometer. The lateral extra bond energies due to the polarizability α of the adsorbates are in the range of thermal energies kTR at room temperature and are particularly interesting for nanotechnology. The concomitant template function will be discussed. The peculiar bond hierarchy also imposes intercalation as another property of sp2 layer systems. Last but not least sp2 layer systems are particularly robust, i.e. survive immersion into liquids, which is a promise for sp2 layers being useful outside ultra high vacuum. [DOI: 10.1380/ejssnt.2010.62]