Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)249-256
Number of pages8
JournalCarbon
Volume128
Publication statusPublished - 1 Mar 2018
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • Shandong University of Science and Technology
  • Qingdao University of Science and Technology
  • CAS - Institute of Metal Research
  • RAS - General Physics Institute
  • Moscow Engineering Physics Institute
  • Institute for Basic Science

Abstract

The suitability of the Ni[sbnd]MgO catalyst as a catalyst in chiral-selective growth of single-walled carbon nanotubes (SWNTs) by chemical vapor deposition has been assessed. It reveals that catalyst calcination temperature plays an important role in affecting the catalyst performances. Using CO as the carbon precursor and a chemical vapor deposition reaction temperature of 600 °C, Ni[sbnd]MgO pre-calcined at 600 °C demonstrates the best performances in catalyzing the growth of SWNTs with predominant (6, 5) species. Systematic characterizations on catalysts calcinated at different temperatures indicate that Ni2+ ions diffuse towards the interior of MgO matrix upon annealing. DFT-based calculations reveal that the binding energy between Ni2+ and adjacent Ni(0) is larger than that between Mg2+ and Ni (0), while Ni2+ situated deep inside MgO has weak interactions with surface Ni atoms. This work highlights the importance of subsurface Ni2+ in anchoring reduced surface Ni atom, which inhibits the aggregation of Ni particles and therefore, facilitates the growth of SWNTs with a narrow chirality distribution.

    Research areas

  • Anchoring effect, Catalyst, Chirality selective, Reduction temperature, Single-walled carbon nanotube, Solid solution

ID: 16608943