CNR-ISC Istituto dei Sistemi Complessi , Via Fosso del Cavaliere 100, 00133 Roma, Italy.
CNR-ISM Istituto di Struttura della Materia , Via Fosso del Cavaliere 100, 00133 Roma, Italy.
Nano Lett. 2016 Mar 9;16(3):1808-17. doi: 10.1021/acs.nanolett.5b04849. Epub 2016 Feb 5.
The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with the instability at high temperature of graphene on the surface of certain metals has been exploited to produce Ar-filled graphene nanosized blisters evenly distributed on the bare Ni(111) surface. We have followed in real time the self-assembling of the nanoblisters during the thermal annealing of the Gr/Ni(111) interface loaded with Ar and characterized their morphology and structure at the atomic scale. The nanoblisters contain Ar aggregates compressed at high pressure arranged below the graphene monolayer skin that is decoupled from the Ni substrate and sealed only at the periphery through stable C-Ni bonds. Their in-plane truncated triangular shapes are driven by the crystallographic directions of the Ni surface. The nonuniform strain revealed along the blister profile is explained by the inhomogeneous expansion of the flexible graphene lattice that adjusts to envelop the Ar atom stacks.
已被利用的可能性是，将稀有气体原子嵌入外延石墨烯单层中，再加上某些金属表面的石墨烯在高温下的不稳定性，从而在裸露的 Ni(111)表面上均匀分布着充满 Ar 的石墨烯纳米大小的气泡。我们实时跟踪了 Gr/Ni(111)界面在加载 Ar 的情况下进行热退火时纳米气泡的自组装，并在原子尺度上对其形态和结构进行了表征。这些纳米气泡包含在高压下压缩的 Ar 聚集体，排列在与 Ni 基底解耦的石墨烯单层下方，仅通过稳定的 C-Ni 键在边缘处密封。它们的平面截断三角形形状由 Ni 表面的晶体方向驱动。通过对气泡轮廓的不均匀应变进行解释，表明了灵活的石墨烯晶格的不均匀膨胀，以适应包裹 Ar 原子堆积。
