Xie Siyu, Wang Jingyun, He Yongkai, Yan Hao, Wang Yu, Li Yage, Wang Sheng, Sun Xiaodan, Yao Youwei, Cai Qiang
State key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Nanotechnology. 2021 May 28;32(33). doi: 10.1088/1361-6528/ac00de.
Polyhedral carbon nano-onions (CNOs) compared with traditional quasi-spherical CNOs are more stable and have less defects, which will greatly broaden their potential applications. However, there still lacks of a suitable synthetic method. Here, we developed a simple molecular fusion route and templet growth method by which polyhedral CNOs can be successfully synthesized. Characterization of the polyhedral CNOs by transmission electron microscopy, x-ray diffraction and Raman spectroscopy indicates that they have an ultra-high degree of graphitization and a large cavity diameter of about 10 nm, which results in their low density of 1.42 g cm. In addition, the deeper reaction mechanism of polyhedral CNOs growth was also elucidated. It was found that the channel structure and the absorption of the templet play the crucial role during the formation of polyhedral CNOs.
与传统的准球形碳纳米洋葱（CNOs）相比，多面体碳纳米洋葱更稳定且缺陷更少，这将极大地拓宽它们的潜在应用。然而，仍然缺乏合适的合成方法。在此，我们开发了一种简单的分子融合路线和模板生长方法，通过该方法可以成功合成多面体CNOs。通过透射电子显微镜、X射线衍射和拉曼光谱对多面体CNOs进行表征，结果表明它们具有超高的石墨化程度和大约10 nm的大腔直径，这导致其密度低至1.42 g/cm³。此外，还阐明了多面体CNOs生长的更深层次反应机理。研究发现，通道结构和模板的吸附在多面体CNOs的形成过程中起着关键作用。
