Structural Changes of 2D FexMn1−xO2 Nanosheets for Low-Temperature Growth of Carbon Nanotubes

Joohyun Lim, Xiaoyan Jin, Seong Ju Hwang, Christina Scheu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The synthesis of carbon nanotubes (CNTs) is usually done by metallic catalysts with a gaseous carbon precursor at high temperature. Yet, mild synthesis conditions can broaden the application of CNTs and their composites. In the present work, it is unraveled why partially substituted Fe ions in 2D MnO2 nanosheets lead to the growth of CNTs at low temperatures of 400−500 °C. The local formation of Fe3C by carbon precursor explains the unusually high catalytic activity of 2D FexMn1−xO2 nanosheets for preparing CNTs. Finally, Fe3C is oxidized to Fe3C/FeOx yolk/shell morphology in ambient atmosphere after the CNT formation reaction. These results shed light on the development of novel catalyst materials that allow for efficiently prepare CNTs under mild conditions for their wider use in energy-harvesting applications.

Original languageEnglish
Article number2003849
JournalAdvanced Functional Materials
Issue number36
StatePublished - 1 Sep 2020


  • 2D nanosheets
  • XANES spectroscopy
  • carbon nanotubes
  • electron energy loss spectroscopy
  • electron microscopy


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