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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2013, 4 (3), P. 425–429

COMPOSITES OF SINGLE WALLED CARBON NANOTUBES AND LIQUID CRYSTALS AS SWITCHABLE CONDUCTORS

M. Vijay Kumar – Centre for Soft Matter Research, Jalahalli, Bangalore 560 013, India; vijayphy@csmr.res.in
S. Krishna Prasad – Centre for Soft Matter Research, Jalahalli, Bangalore 560 013, India; skpras@gmail.com

Realizing large anisotropic electrical conductivity in systems wherein the magnitude of the anisotropy can be switched and controlled by employing an external field such as magnetic, electrical or optical fields is of significant interest. The large electrical conductivities possible with carbon nanotubes (CNT) have been combined with the field-switchable orientation of liquid crystals (LC), although the stabilization of such composites is a difficult proposition. Recently we have performed measurements over reasonable lengths of time where the LC-CNT composites are stable without any serious segregation. Here, we describe the results of electrical conductivity, which establish that the LC-CNT composites have a bright future in applications using switchable electrical insulator-conductor devices, for example Mott insulator-conductor systems. The added advantage, as a result of LC use, is the phenomenal ease with which large scale devices can be fabricated. The present work also discusses possible methods for increasing the loading factor, which currently is quite low.

Keywords: carbon nanotube, liquid crystals.

PACS 61.30.-v, 64.70.mj, 52.25.Mq, 77.84.Nh, 81.07.De

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