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PITOGO

Structural, Morphological and Thermal Study on PI and PI+ITO+GO Polymeric Composite Thin Films

Rajiv Tiwari1 , Dr. Anil Tiwari2 and Dr. Anand Kumar Gupta3 1, 2Department of Physics, Swami Vivekanand University, Sagar, M.P., India

Abstract: Metal oxide incorporated polymeric composite thin films are of great interest to many applications because oxides within polymer matrix display a very wide range of properties like for the applications such as flexible thin films for solar cell, conducting transistors etc. The composite materials wherein inorganic particles are structured within a polymer matrix are likely to exhibit superior properties because of the size of the incorporated material. The study such as FT-IR, TGA, SEM and AFM has been discussed. Keywords: Polyimide, Indium Tin Oxide, Graphene Oxide, FT-IR, TGA, SEM, AFM.

I. INTRODUCTION

In mid of the nineteenth century polymeric material made up of human being are start replacing the conventional material. Due to different role of molecular shape and size, polymers or polymer based material are unique and belong to different class of material. The foregoing importance regarding the usefulness of metal oxide incorporated polymeric composite thin films opens the new dimension of study where the structure-morphological, thermal, micromechanical, electrical etc. can be correlated to develop new materials of desirable properties for advance technology. The controlling of disperse metal oxide particle in term of shape and size within the polymer matrix using different processessing technique is currently a frontier field of research with far reaching implications for new technologies. Polymer composites materials in which inorganic particles are dispersed in an organic polymer matrix at micro/ nano meter regime in order to significantly improve the performance properties of the polymer [1]-[3] The conceptual key for selecting metal oxide and polymer is that, they have the ability of forming interaction between them on exothermic heat of mixing. Polyimide (PI) will play the role of host polymer matrix during the tenure of research work. PI had the fundamental aspects of macromolecular science, which will provide the base for developing innovative techniques for the synthesis of high temperature flexible thin film. The Indium Tin Oxide (ITO) and Graphene Oxide (GO) possess excellent compatibility and reinforcing agent behaviour with other organic material like polymer. Moreover, apart from that both exhibits very good optical and electrical characteristic that makes them the great potential candidate to be incorporated within the PI matrix [4]-[7]. The PI and PI+ITO+GO polymeric composite thin films of different composition were prepared and explore to various characterization like FT-IR, TGA, SEM and AFM. The chemical functional groups within the composite thin films are explained using FT-IR technique. TGA characterization helps to understand the decomposition temperature of the PI and developed composite thin films. SEM and AFM micrograph helps to visualize the phase morphology and to detect the nano/ micro phase-domain structure within the composite thin films.

II. CHARACTERIZATION

A. Synthesis of ITO + GO Incorporated PI Composite Thin films The ITO + GO + PAA composite solutions were weighed onto dry and clean glass plates and spread evenly using a spin-coating unit in a dust and moisture free chamber. Then it was conditioned at 70°C for 24 hours and thereafter subjected to curing for ½ hour each at 100, 150, 200, 250, 300 and 360C for the first step, which partially imidizes the reactant. Subsequently, it was ultimately cured at 360C for 2 hrs and then allowed to cool slowly to room temperature to get ITO + GO incorporated PI composite thin films. The pure PAA was also cured under identical conditions to form pure PI film. Most important number of mixed solution and film synthesis was tried, but the best was taken for further study. The different weight percentages of composite solutions were shown in table 1. The films were of 10 cm2 in area and 15 ± 0.0002 µm in thickness, and the same were used for all the characterizations.