【作者】 亓月； 张艳锋； 刘忠范；

【Author】 Yue Qi;Yanfeng Zhang;Zhongfan Liu;Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University;

【机构】 北京大学化学与分子工程学院,纳米化学研究中心；

【摘要】 该工作主要是利用苯三炔作为前驱体在Rh(111)基底上进行石墨烯的生长。由于苯三炔分子与Rh(111)基底之间具有很强的π-d轨道杂化作用,可以在室温下实现苯三炔在Rh(111)基底上的沉积。我们分别利用程序升温以及直接升至目标温度两种生长模式进行石墨烯的生长。程序升温过程中,苯三炔分子在整个升温过程中,基本保持了其完整的苯环结构,使得在较低温度下就可实现石墨烯的合成。我们还利用STM观察到石墨烯形成的中间状态:分子低聚物以及石墨烯的纳米团簇。有趣的是,利用直接升至目标温度的生长模式可以得到更高质量,没有缺陷和畴区边界的完美石墨烯,原因是在直接升温过程中,苯三炔前驱体得到了充分的裂解和扩散。更多还原

【Abstract】 Selecting distinctive carbon precursors can mediate graphene synthesis, for example, using C₆₀^[1] to produce graphene quantum dots or hexabromobenzene^[2] to achieve graphene at rather low temperature. Herein, 1,3,5-triethynylbenzene（TEB） is selected for the first time as the carbon precursor for graphene synthesis on Rh（111）. Room-temperature adsorption followed with a temperature-programmed annealing or direct annealing to target growth temperature under the ultrahigh vacuum conditions are designed to be the two synthesis pathways. In the former growth pathway, the benzene ring of the TEB unit is expected to be maintained throughout the whole annealing process, leading to high yielding graphene at relatively low temperature as compared with existing synthesis via gaseous precursors. Several-molecule oligomers and graphene nanoclusters are detected to be the crucial intermediates, as evidenced by scanning tunneling microscopy（STM） characterizations. Interestingly, graphene synthesized via the latter pathway usually possesses less domain boundaries and defects due to sufficient diffusion and rearrangement of carbon precursors.更多还原