期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 2, 页码 387-393出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm02395g
关键词
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资金
- Research Council of Sharif University of Technology
- Iran Nanotechnology Initiative Council
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.
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