Reversible transformation of hydrophobicity and hydrophilicity of aligned carbon nanotube arrays and buckypapers by dry processes

H. Z. Wang, Z. P. Huang, Q. J. Cai, K. Kulkarni, Chung-Lung Chen, D. Carnahan, Z. F. Ren*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Dry treatment using a combination of UV and ozone can readily change the surface of vertically aligned carbon nanotubes from superhydrophobic to superhydrophilic. This treatment is also effective for buckypapers. Heating in a vacuum at an elevated temperature (650-750 °C) can reverse the surface state from superhydrophilic to superhydrophobic. The UV & ozone treatment causes the least amount of damage to the stripe-like carbon nanotube patterns. The effect of rough surface on apparent contact angles of CNT forests was discussed to explain the origin of superhydrophilicity and superhydrophobicity.

Original languageEnglish
Pages (from-to)868-875
Number of pages8
JournalCarbon
Volume48
Issue number3
DOIs
StatePublished - 1 Mar 2010

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