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Silver nanoparticles within vertically aligned multi-wall carbon nanotubes with open tips for antibacterial purposes

Akhavan, O ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1039/c0jm02395g
  3. Publisher: 2011
  4. Abstract:
  5. Vertically aligned multi-wall carbon nanotube (CNT) arrays were fabricated in tip-growth mode on Ni/Si substrates using plasma enhanced chemical vapor deposition. In a purification process including hydrogenation and acid washing of the Ni/CNTs, the oxygen-containing functional groups were substantially reduced and a wide hollow core at the tip of the CNTs was formed by removing the Ni seeds. Sol-gel silver nanoparticles were deposited on the surface of the unpurified Ni/CNTs, while they could also be embedded within the hollow core of the Ni-removed CNTs. The persistency of the silver ions in the Ni-removed Ag-CNTs in comparison to the release of the silver ions from the Ag-Ni/CNTs in a dilute HNO3 solution confirmed the effective embedding of the Ag nanoparticles within the hollow core of the Ni-removed CNTs. The Ni-removed Ag-CNTs showed a strong antibacterial activity against Escherichia coli bacteria in the dark (inactivation of 99.8 ± 0.1% of the bacteria as compared to the Ni-removed CNTs and the Ag-Ni/CNTs with 62 ± 11 and 47 ± 18% inactivation in 120 min), while the bacteria even exhibited some proliferation on the surface of the unpurified Ni/CNT arrays. In the context of cell membrane rupture of the bacteria through a direct contact mechanism, it was proposed that the Ni seeds acted as obstacles for an effective contact between the bacteria and the tips of the CNT arrays
  6. Keywords:
  7. Acid washing ; Ag nanoparticle ; Anti-bacterial activity ; Direct contact ; Effective contact ; Escherichia coli bacteria ; Growth modes ; Hollow cores ; Membrane rupture ; Purification process ; Silver ions ; Silver nanoparticles ; Vertically aligned ; Bacteriology ; Carbon nanotubes ; Cell membranes ; Cytology ; Escherichia coli ; Functional groups ; Metal ions ; Multiwalled carbon nanotubes (MWCN) ; Nanoparticles ; Oxygen ; Plasma deposition ; Plasma enhanced chemical vapor deposition ; Walls (structural partitions) ; Silver
  8. Source: Journal of Materials Chemistry ; Volume 21, Issue 2 , Oct , 2011 , Pages 387-393 ; 09599428 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2011/JM/C0JM02395G#!divAbstract