Experimental Demonstration of Hydrophobicity Variation in Carbon Nanotubes by Surface Modifications

A Mathur, S Wadhwa, JA Byrne, SS Roy, JAD McLaughlin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Surface modification of the carbon nanotubes is important for their application in various fields. In this study, multiwalled carbon nanotubes (MWCNTs) were grown on cobalt catalyst layer (3 nm thickness) sputtered on a silicon substrate using Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD) system. The as-grown MWCNT layer was found to have a thickness of ∼5 μm and an average nanotube diameter ∼70 nm. The surface of as-grown nanotubes was modified by polyvinyl alcohol (PVA). The surface hydrophobicity has been estimated by measuring the static contact angles of water on nanotube surfaces before and after the modification by varying PVA concentration in the range of 1:10,000-5:10,000 (w/v). This functionalisation showed a dramatic change of the surface of nanotubes from highly hydrophobic to hydrophilic. The fictionalization of MWCNTs was confirmed further with electrochemical measurements.
LanguageEnglish
Pages334-336
Journale-Journal of Surface Science and Nanotechnology
Volume7
DOIs
Publication statusPublished - Oct 2009

Fingerprint

Nanotubes
Carbon Nanotubes
Hydrophobicity
hydrophobicity
Hydrophobic and Hydrophilic Interactions
Surface treatment
Multiwalled carbon nanotubes (MWCN)
Carbon nanotubes
Demonstrations
carbon nanotubes
nanotubes
Polyvinyl Alcohol
Polyvinyl alcohols
polyvinyl alcohol
Silicon
Plasma enhanced chemical vapor deposition
Microwaves
Cobalt
Contact angle
cobalt

Keywords

  • Nanotubes
  • Scanning electron microscopy (SEM)
  • Sputtering
  • Contact angle
  • Surface energy

Cite this

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Experimental Demonstration of Hydrophobicity Variation in Carbon Nanotubes by Surface Modifications. / Mathur, A; Wadhwa, S; Byrne, JA; Roy, SS; McLaughlin, JAD.

In: e-Journal of Surface Science and Nanotechnology, Vol. 7, 10.2009, p. 334-336.

Research output: Contribution to journalArticle

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AB - Surface modification of the carbon nanotubes is important for their application in various fields. In this study, multiwalled carbon nanotubes (MWCNTs) were grown on cobalt catalyst layer (3 nm thickness) sputtered on a silicon substrate using Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD) system. The as-grown MWCNT layer was found to have a thickness of ∼5 μm and an average nanotube diameter ∼70 nm. The surface of as-grown nanotubes was modified by polyvinyl alcohol (PVA). The surface hydrophobicity has been estimated by measuring the static contact angles of water on nanotube surfaces before and after the modification by varying PVA concentration in the range of 1:10,000-5:10,000 (w/v). This functionalisation showed a dramatic change of the surface of nanotubes from highly hydrophobic to hydrophilic. The fictionalization of MWCNTs was confirmed further with electrochemical measurements.

KW - Nanotubes

KW - Scanning electron microscopy (SEM)

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