The work presents a new carbon nanostructure in the form of stacked toroidal carbon nanotubes (STCNT) crystallized from the gas phase through a catalyst-free deposition process. Vapor-grown STCNT were obtained on a graphite substrate using methane as a source of carbon. The carbon structure was analyzed using Transmission Electron Microscopy (TEM), Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDX), Raman spectroscopy, X-ray Diffraction and X-ray photoelectron spectroscopy. The TEM images revealed that the nanostructured carbon phase consisted of a single toroidal element (toroid) that was composed of rolled multi-walled carbon nanotubes. The SEM/EDX study of different substrate sites showed the presence of the pure carbon structure. The average external diameter of a single toroid was 1000 nm, and the average distance between neighboring toroids was 100 nm. The space inside the toroids contained carbon spheres made of turbostratic crystallites.

这项工作提出了一种新的碳纳米结构，其形式是通过无催化剂沉积工艺从气相中结晶出的堆叠环形碳纳米管（STCNT）。使用甲烷作为碳源，在石墨基底上获得了气相生长的STCNT。使用透射电子显微镜（TEM），具有能量色散X射线光谱的扫描电子显微镜（SEM / EDX），拉曼光谱，X射线衍射和X射线光电子光谱来分析碳结构。TEM图像表明，纳米结构的碳相由单个环形元素（环形）组成，该环形元素由卷曲的多壁碳纳米管组成。SEM / EDX对不同底物部位的研究表明存在纯碳结构。单个环面的平均外径为1000 nm，相邻环之间的平均距离为100 nm。环形内部的空间包含由涡轮层晶形成的碳球。