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Phys Rev Lett. 2003 Mar 14;90(10):106603. Epub 2003 Mar 14.

Quantum conductance steps in solutions of multiwalled carbon nanotubes.

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1
Departamento de Electrónica, Tecnología de Computadoras y Proyectos, Universidad Politécnica de Cartagena, C/Doctor Fleming s/n, 30202 Cartagena, Murcia, Spain. aurbina@upct.es

Abstract

We have prepared solutions of multiwalled carbon nanotubes in Aroclor 1254, a mixture of polychlorinated biphenyls. The solutions are stable at room temperature. Transport measurements were performed using a scanning-tunneling probe on a sample prepared by spin coating the solution on gold substrates. Conductance steps were clearly seen. A histogram of a high number of traces shows maximum peaks at integer values of the conductance quantum G(0)=2e(2)/h, demonstrating ballistic transport at room temperature along the carbon nanotube over distances longer than 1.4 microm.

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