当研究小组将合成物放于显微镜下检测时，他们发现石墨烯已完全被氮化硅微粒包裹，形成了一道道连续的“墙壁”。
When the team examined what they had done under a microscope, they found that the graphene had wrapped itself around the silicon-nitride grains, forming continuous walls.
通过将石墨烯薄片放置在一个氮化硅薄膜上，并用电子束在石墨烯上打出纳米尺度的孔，他们制作出了一系列从5到25nm直径的孔。
They create a series of pores ranging from 5 to 25 nm in diameter by placing flakes of graphene over a silicon nitride membrane and drilling nanosized holes in the graphene using an electron beam.
其后的实验和理论研究表明类似石墨烯片层结构的其他材料，如六方氮化硼和二硫化金属化合物等，也可以形成类似的管状结构。
Latest experimental and theoretical studies demonstrate that it is quite possible that the nanotube structures can be prepared from other layered materials.
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