Phase transitions on the surface of a carbon nanotube

Abstract

A suspended carbon nanotube can act as a nanoscale resonator with remarkable electromechanical properties and the ability to detect adsorption on its surface at the level of single atoms. Understanding adsorption on nanotubes and other graphitic materials is key to many sensing and storage applications. Here we show that nanotube resonators offer a powerful new means of investigating fundamental aspects of adsorption on carbon, including the collective behaviour of adsorbed matter and its coupling to the substrate electrons. By monitoring the vibrational resonance frequency in the presence of noble gases, we observe the formation of monolayers on the cylindrical surface and phase transitions within these monolayers, and simultaneous modification of the electrical conductance. The monolayer observations also demonstrate the possibility of studying the fundamental behaviour of matter in cylindrical geometry.

Unpublished; 7 pages with 4 figures plus 3 pages of supplementary material

References in corpus (8)

• A tunable carbon nanotube electromechanical oscillator
• An Atomic-resolution nanomechanical mass sensor
• Strong coupling between single-electron tunneling and nano-mechanical motion
• Carbon nanotubes as ultra-high quality factor mechanical resonators
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• Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
• Evidence of 1D behaviour of He${}^4$ confined within carbon-nanotube bundles

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