Electron microscopy characterization of nanostructured carbon obtained from chlorination of metallocenes and metal carbides
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- 作者：David Á ; vila-Br ; e ; Esteban Urones-Garrote ; Nebil A. Katcho ; Enrique Lomba ; Adriá ; n Gó ; mez-Herrero ; Á ; ngel R. L ; a-Cá ; novas ; L. Carlos Otero-Dí ; az
- 关键词：TEM ; SEM ; Carbon nanostructures ; Disordered nanotubes ; EELS ; Nano-cabbages ; Ferrocene ; Niobium carbide ; Cobaltocene
- 刊名：Micron
- 出版年：2007
- 出版时间：June 2007
- 年：2007
- 卷：38
- 期：4
- 页码：335-345
- 全文大小：2591 K
文摘
In this work we report some new well-defined carbon nanostructures produced by direct chlorination of metallocenes (ferrocene and cobaltocene) and NbC, at temperatures from 100 to 900 °C. Thus, amorphous carbon nanotubes with variable dimensions depending on reaction temperature were produced from ferrocene. When cobaltocene is the carbon precursor the main product are solid amorphous nanospheres. The high refractory metal carbide NbC as carbon source favours the growth of nanospherical cabbage-like particles with a higher degree of graphene sheets order. Besides, NbC crystallites encapsulated in an amorphous carbon shell were also found at lower temperatures (T ≤ 700 °C).