J Heyrovský Institute of Physical Chemistry, Academy of Sciences of Czech Republic, Prague, Czech Republic.
Nanotechnology. 2010 Mar 5;21(9):095707. doi: 10.1088/0957-4484/21/9/095707. Epub 2010 Feb 8.
Ambient gas nanobubbles of size approximately 10(1)-10(2) nm occupying the hydrophobic surface of basal plane highly ordered pyrolytic graphite (HOPG) immersed in aqueous media at room temperature cause exfoliation of the top graphene layers, as revealed by both in situ and ex situ atomic force microscope (AFM) imaging. The formation of nanoparticles composed mostly from graphene-based nanoscrolls, nanohorn-like and onion-like nanostructures was resolved by high resolution transmission electron microscopy (TEM) and examined by diffraction and x-ray photoelectron spectroscopy (XPS) analyses. The diameter of nanostructures varied from about 5 nm for single-layered scrolls to tens of nanometres for multishells. Raman spectroscopy confirmed the structural rearrangement of the HOPG basal plane after the above-mentioned treatment. The implications for nanobubble interfacial forces are discussed.
室温下，占据基底平面高取向热解石墨（HOPG）疏水面的尺寸约为 10(1)-10(2)nm 的环境气体纳米气泡会导致顶层石墨烯层的剥落，这一点通过原位和非原位原子力显微镜（AFM）成像都得到了揭示。通过高分辨率透射电子显微镜（TEM）解析并通过衍射和 X 射线光电子能谱（XPS）分析检测到，主要由基于石墨烯的纳米螺旋、纳米角状和洋葱状结构组成的纳米颗粒的形成。纳米结构的直径从单层螺旋的约 5nm 到多层螺旋的数十纳米不等。拉曼光谱证实了上述处理后 HOPG 基面的结构重排。讨论了纳米气泡界面力的影响。
