Nonlinear optical properties of polyaniline and poly (o-toluidine) composite thin films with multi walled carbon nano tubes

Nagaraja, K K and Pramodini, S and Poornesh, P and Telenkov, M P and Kityk, I V (2017) Nonlinear optical properties of polyaniline and poly (o-toluidine) composite thin films with multi walled carbon nano tubes. Physica B: Condensed Matter, 1 (512). pp. 45-53. ISSN 09214526

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Abstract

We report the improved third-order nonlinear optical properties of polyaniline and poly (o-toluidine) with different doping concentrations of multi walled carbon nano tube (MWCNTs) composite thin films investigated using z-scan technique and continuous wave He–Ne laser at 633 nm wavelength was used as source of excitation. Thin films were prepared by spin coating technique on glass substrate. The structural properties of the composite films were analysed by X-ray diffraction studies and the characteristic peaks corresponding to MWCNTs and polymers have been observed. The surface morphology of the deposited films was analysed using canning electron microscopy and it confirms that the polymer in the composites has been coated on the MWCNTs homogeneously. The z-scan results reveal that the films exhibit reverse saturable absorption and selfdefocusing nonlinearity. The third-order nonlinear optical susceptibility χ(3) is found to be of the order of 10−3 esu. Also, optical power limiting and clamping experiment was performed. The clamping values increases with increase in concentration and the lowest clamping observed for composite films are 1 mW and 0.7 mW.

Item Type: Article
Uncontrolled Keywords: Carbon nanotubes (CNT), Polymers, Nonlinear optical property (NLO), Z-scan, Optical limiting
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 04 May 2017 04:10
Last Modified: 04 May 2017 04:10
URI: http://eprints.manipal.edu/id/eprint/148805

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