Title

Tunable Friction Behavior of Oriented Carbon Nanotube Films

Document Type

Article

Publication Date

10-2006

Publication Source

Tribology Letters

Abstract

Measured friction coefficients of carbon nanotubes vary widely from μ < 0.1–μ > 1.0 [16], while theoretical studies suggest intrinsically high friction coefficients, approaching unity [7]. Here we report that measured friction coefficients of MWNT films are strong functions of surface chemistry and temperature, but are not dependent on the presence of water vapor. We hypothesize that the origin of the temperature dependence arises from the interaction of the surface chemical groups on the nanotubes [812] and rubbing counterface. The friction coefficient of individual films can be easily tuned by changing the surface temperature and chemistry of either the countersurface or the nanotubes, we have demonstrated the ability to create and control high and low friction pairs through plasma treatments of the nanotube films with argon, hydrogen, nitrogen, and oxygen. This behavior is completely reversible, and when coupled with the superior strength, thermal, and electrical properties of nanotubes, provides a versatile tunable, multifunctional tribological system.

Inclusive pages

85-90

ISBN/ISSN

1023-8883

Comments

Permission documentation is on file.

Publisher

Kluwer Academic Publishers-Plenum Publishers

Volume

24

Issue

1