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Coupling of photomechanical and electromechanical actuations in carbon nanotubes

Suri, Ashish and Misra, Abha (2013) Coupling of photomechanical and electromechanical actuations in carbon nanotubes. In: NANOTECHNOLOGY, 24 (10).

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Official URL: http://dx.doi.org/10.1088/0957-4484/24/10/105501

Abstract

It is known that carbon nanotubes (CNTs) possess multifunctional characteristics, which are applicable for a wide variety of engineering applications. CNT is also recognized as a radiation sensitive material, for example for detecting infrared (IR) radiations. One of the direct implications of exposing CNTs to radiation is the photomechanical actuation and generation of a photovoltage/photocurrent. The present work focuses on coupling electromechanical and photomechanical characteristics to enhance the resulting induced-strain response in CNTs. We have demonstrated that after applying an electric field the induced strain in CNT sheet is enhanced to about similar to 2.18 times for the maximum applied electric field at 2 V as compared to the photo-actuation response alone. This enhancement of the strain at higher bias voltages (> 1 V) can be considered as a sum of individual contributions of the bias voltage and IR stimulus. However, at lower voltage (< 1 V) the enhancement in the resulting strain has been attributed to the associated electrostatic effects when CNTs are stimulated with IR radiation under external bias conditions. This report reveals that voltage bias or IR stimulus alone could not produce the observed strain in the CNT sheet under lower bias conditions.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to IOP PUBLISHING LTD, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Francis Jayakanth
Date Deposited: 22 Mar 2013 07:28
Last Modified: 22 Mar 2013 07:28
URI: http://eprints.iisc.ac.in/id/eprint/46153

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