Functionalization of Carbon Nano-onions by Direct Fluorination
Functionalization of Carbon Nano-onions by Direct Fluorination
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DOI：
10.1021/cm062177j
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发表时间：
2007-01
影响因子：
8.6
通讯作者：
Yu Liu;R. V. Wal;V. Khabashesku
中科院分区：
文献类型：
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作者：
Yu Liu;R. V. Wal;V. Khabashesku
碳纳米洋葱（CNO）由同心的类富勒烯壳制成，结构范围从双层、三层到多层。它们仍然是迄今为止研究最少的碳同素异形体。在本研究中，报道了一种通过在不同温度下直接氟化添加氟来对 CNO（50−100 nm 直径）进行功能化的一步过程。 CNO 在 350、410 和 480 °C 三个不同温度下反应，分别产生化学计量约为 C10.1F、C3.3F 和 C2.3F 的氟化纳米洋葱 (F-NO)，代表了一个新的纳米级氟碳材料家族。 F-NO 通过一系列材料表征方法进行表征，包括 FTIR、拉曼、紫外可见分光光度计和 X 射线光电子能谱、扫描 (SEM) 和透射电子显微镜 (TEM)、X 射线衍射和热重分析。 SEM 和 TEM 图像显示，即使在 CNO 中的石墨烯层被氟破坏后，F-NO 产品仍保留球形洋葱形形态。
Carbon nano-onions (CNO) are made of concentric fullerene-like shells and range from double- and triple- to multilayered structures. They remain the least studied allotrope of carbon yet. In the present study, a one-step process for functionalization of CNO (50−100 nm diameter) by addition of fluorine through direct fluorination at variable temperatures is reported. The reactions of CNO at three different temperatures, 350, 410, and 480 °C, yield fluorinated nano-onions (F-NO) of approximately C10.1F, C3.3F, and C2.3F stoichiometry, respectively, representing a new family of nanoscale fluorocarbon materials. The F-NO were characterized by a set of materials characterization methods including FTIR, Raman, UV−vis, and X-ray photoelectron spectroscopy, scanning (SEM) and transmission electron microscopy (TEM), X-ray diffraction, and thermal gravimetric analysis. SEM and TEM images show that even after breaking of the graphene layers in CNO by fluorine, the F-NO products retain the spherical onion-shaped morp...