Effect of Enhanced Thermal Stability of Alumina Support Layer on Growth of Vertically Aligned Single-Walled Carbon Nanotubes and Their Application in Nanofiltration Membranes

Jung Bin In, Kang Rae Cho, Tung Xuan Tran, Seok Min Kim, Yinmin Wang, Costas P. Grigoropoulos, Aleksandr Noy, Francesco Fornasiero

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We investigate the thermal stability of alumina supporting layers sputtered at different conditions and its effect on the growth of aligned single-walled carbon nanotube arrays. Radio frequency magnetron sputtering of alumina under oxygen–argon atmosphere produces a Si-rich alumina alloy film on a silicon substrate. Atomic force microscopy on the annealed catalysts reveals that Si-rich alumina films are more stable than alumina layers with low Si content at the elevated temperatures at which the growth of single-walled carbon nanotubes is initiated. The enhanced thermal stability of the Si-rich alumina layer results in a narrower (< 2.2 nm) diameter distribution of the single-walled carbon nanotubes. Thanks to the smaller diameters of their nanotube pores, membranes fabricated with vertically aligned nanotubes grown on the stable layers display improved ion selectivity.

Original languageEnglish (US)
Article number173
JournalNanoscale Research Letters
Volume13
DOIs
StatePublished - Jan 1 2018
Externally publishedYes

Keywords

  • Alumina
  • Catalyst
  • CNT membrane
  • Single-walled carbon nanotube

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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