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CO2 laser treatment for stabilization of the superhydrophobicity of carbon nanotube surfaces

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6 Author(s)
Ramos, S.C. ; Laboratório Associado de Sensores e Materiais (LAS), Instituto Nacional de Pesquisas Espaciais (INPE), Avenida dos Astronautas 1758, São José dos Campos, São Paulo, SP 12227-010, Brazil and Universidade Estadual da Bahia (UNEB), Avenida Contorno, S/N, Centro, Caetité, Bahia, BA 46400-000, Brazil ; Vasconcelos, G. ; Antunes, E.F. ; Lobo, A.O.
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In this work, the authors demonstrate the formation of stable superhydrophobic vertically aligned multiwalled carbon nanotube (VACNT) surfaces through CO2 laser irradiance, in which the contact angle value reached 161°. VACNT arrays were synthesized by microwave plasma chemical vapor deposition using N2/H2/CH4 [10/90/14 SCCM (SCCM denotes cubic centimeter per minute at STP)]. CO2 laser technique was applied on VACNT surfaces with irradiance at different laser powers to promote the great stability of superhydrophobic surfaces. Contact angle measurement reveals that irradiated VACNT surface is superhydrophobic at all irradiances tested. Unlike as-grown VACNT, the samples treated with CO2 laser show no sign of water seepage even after a prolonged period of time (∼24 h). This characteristic is very interesting and has various possible functional applications in micro- and nanomaterials and devices.

Published in:

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:28 ,  Issue: 6 )

Date of Publication:

Nov 2010

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