Structure and magnetic response of a residual metal catalyst in highly purified single walled carbon nanotubes

0394526 - FZÚ 2014 RIV GB eng J - Journal Article
Pacáková Bittová, Barbara - Kalbáč, Martin - Kubíčková, Simona - Mantlíková, Alice - Mangold, S. - Vejpravová, Jana
Structure and magnetic response of a residual metal catalyst in highly purified single walled carbon nanotubes.
Physical Chemistry Chemical Physics. Roč. 15, č. 16 (2013), s. 5992-6000. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR GAP204/10/1677
Institutional support: RVO:68378271 ; RVO:61388955
Keywords : carbon nanotubes * purification * nanoparticles * magnetic property measurements
Subject RIV: BM - Solid Matter Physics ; Magnetism; CF - Physical ; Theoretical Chemistry (UFCH-W)
Impact factor: 4.198, year: 2013

Article presents methods for physical analysis of partial steps leading to the removal of residual metal catalyst nanoparticles (NPs) from single walled carbon nanotubes (SWCNTs) and options for detecting negligible amount of metal in samples possessing diamagnetic response. Based on the previous knowledge of the NP properties included in the commercial SWCNTs, the properties of remaining NPs after the multi-step purification and annealing under static and dynamic vacuum have been investigated. TG, XRD, magnetic property measurements and EXAFS experiments have been done and provided information about the nature of the residual NPs in purified SWCNTs, crucial for further understanding of the purification processes and their improvement. We demonstrated that even if all macroscopic methods indicate a high purity of the treated sample, a non-negligible amount of the metal may still be present and the metal content has to be examined using local element sensitive probes such as EXAFS.
Permanent Link: http://hdl.handle.net/11104/0222720