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Phase Transitions in C:Ni Nanocomposite Templates during Diameter-Selective CVD Synthesis of SWCNTs.
- Source :
- Physica Status Solidi (B); Nov2017, Vol. 254 Issue 11, pn/a-N.PAG, 6p
- Publication Year :
- 2017
-
Abstract
- Phase transitions in carbon:nickel nanocomposite templates during diameter-selective CVD synthesis of SWCNTs were studied. While almost conserving their pre-defined diameter distribution, as-deposited Ni<subscript>3</subscript>C nanoparticles transform into fcc-NiO during activation in low-pressure air atmosphere, and are reduced to a mixture of fcc-Ni and Ni<subscript>3</subscript>C under nanotube growth conditions. The first phase transition leads to a substitutional replacement of the protective carbon matrix by a protective oxide layer. The second one reflects competing reduction processes of NiO. A mechanism for the complementary roles of carbon matrix and Ni species in the three-step CVD synthesis is proposed that includes nanoparticle immobilization, carbon delivery and catalysis of nanotube growth. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03701972
- Volume :
- 254
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Physica Status Solidi (B)
- Publication Type :
- Academic Journal
- Accession number :
- 126261749
- Full Text :
- https://doi.org/10.1002/pssb.201700228