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Electrical Characterization of Polyaniline-ZnO nano-composite Langmuir-Blodgett thin films by Conductive Atomic Force Microscopy

Published online by Cambridge University Press:  29 August 2014

Gurpreet Kaur Bhullar ,
Ramneek Kaur  and
K. K. Raina
Gurpreet Kaur Bhullar
Affiliation:
Materials Research Laboratory, School of Physics and Materials Science, Thapar University, Patiala-147004, India
Ramneek Kaur
Affiliation:
Materials Research Laboratory, School of Physics and Materials Science, Thapar University, Patiala-147004, India
K. K. Raina
Affiliation:
Materials Research Laboratory, School of Physics and Materials Science, Thapar University, Patiala-147004, India
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Abstract

Polyaniline–Zinc oxide nano-composite material was prepared by chemical polymerization of aniline with ZnO nano-particles doping. Surface Pressure-Area (π-A) isotherms of Polyaniline (PANi) and Polyaniline–Zinc oxide nano-composite shows phase transformations of monolayer during compression process. Multiple isotherms indicate that the monolayer of the composite material can retain its configuration during compression-expansion cycles. The structural, topographical and electrical properties of these deposited Langmuir Blodgett films were studied and characterized by UV-Visible spectroscopy (UV), Atomic force microscopy (AFM), Conductive Atomic force microscopy (C-AFM) respectively. For detailed investigations of the LB film properties, Conductive AFM is used to measure the I-V relationship of a surface of Langmuir Blodgett (LB) films of Polyaniline and Polyaniline–Zinc oxide nano-composite. The contact size of the AFM cantilever tip can be as small as a few nanometers, so, the local variation of the electrical property, which is unseen in the macroscopic level, can be observed by the I-V curve. A current ranging up to 3 nA and 20 nA have been observed in the case of PANi and PANi-ZnO nano-composite LB film, respectively. Conductive data images of the ITO substrate, PANi and PANi-ZnO nano-composite LB film on the ITO substrate obtained with an applied bias voltage of 4V showed that the distribution of current on the whole surface is almost uniform and very less inhomogeneities have been observed in the surface conductance of the PANi and PANi-ZnO nano-composite LB film.

Keywords

polymerthin filmscanning probe microscopy (SPM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1668: Symposium C – Synthesis and Processing of Organic and Polymeric Materials for Semiconductor Applications , 2014 , mrss14-1668-c06-17
Copyright
Copyright © Materials Research Society 2014 

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