Catalan Institute of Nanotechnology (ICN) and Universitat Autònoma de Barcelona, UAB Campus, E-08193 Bellaterra (Barcelona), Spain.
Nano Lett. 2012 Sep 12;12(9):4431-6. doi: 10.1021/nl300897m. Epub 2012 Aug 21.
The catalytic decomposition of hydrocarbons on transition-metal surfaces has attracted increasing interest as a method to prepare high quality graphene layers. Here, we study the optimal reaction path for the preparation of graphene nanoislands of selected shape using controlled decomposition of propene on Ni(111). Scanning tunneling microscopy performed at different stages of the reaction provides insight into the temperature and dose-dependent growth of graphene islands, which precedes the formation of monolayer graphene. The effect of postreaction annealing on the morphology of the islands is studied. By adjusting the initial propene dose, reaction temperature, and postannealing procedure, islands with a triangular or hexagonal shape can be selectively obtained.
过渡金属表面上的碳氢化合物催化分解作为一种制备高质量石墨烯层的方法引起了越来越多的关注。在这里，我们研究了在 Ni(111)上通过控制丙烯分解来制备选定形状的石墨烯纳米岛的最佳反应路径。在反应的不同阶段进行的扫描隧道显微镜研究提供了对石墨烯岛的温度和剂量依赖性生长的深入了解，这先于单层石墨烯的形成。研究了后反应退火对岛的形态的影响。通过调整初始丙烯剂量、反应温度和后退火程序，可以选择性地获得三角形或六边形形状的岛。
