排斥作用对纳米粒子形状的选择：少层石墨烯上的金属岛
Nanoparticle Shape Selection By Repulsive Interactions: Metal Islands on Few Layer Graphenes
摘要：
吸附在少层石墨烯上的金属原子冷凝以形成纳米尺寸的液滴，其生长受到来自金属液滴和石墨烯之间的电荷转移的表面张力和排斥静电相互作用之间的竞争的尺寸限制。对于功函数失配大且液滴表面张力小的情况，生长的液滴对于一族形状不稳定性而言可能是不稳定的。我们观察到这种现象的Yb沉积和退火的几层石墨烯和开发一个理论模型来描述它通过研究的重整化的线张力的二维液滴的排斥粒子间的相互作用。我们的模型描述了纳米颗粒的形状不稳定性的发生，其中的生长是由一个通用的排斥势的大小限制，并提供了一个很好的帐户的实验观察到的结构Yb在石墨烯上。
英文摘要：
Metal atoms adsorbed on few layer graphenes condense to form nanometer-size droplets whose growth is size limited by a competition between the surface tension and repulsive electrostatic interactions from charge transfer between the metal droplet and the graphene. For situations where the work function mismatch is large and the droplet surface tension is small, a growing droplet can be unstable to a family of shape instabilities. We observe this phenomenon for Yb deposited and annealed on few layer graphenes and develop a theoretical model to describe it by studying the renormalization of the line tension of a two dimensional droplet by repulsive interparticle interactions. Our model describes the onset of shape instabilities for nanoparticles where the growth is size-limited by a generic repulsive potential and provides a good account of the experimentally observed structures for Yb on graphene.
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