Abstract
Conducting polymer nanocomposites (PANI-CNT and POAS-CNT) have been synthesized by polymerization of aniline (ANI)/ o-anisidine (OAS) in the presence of functionalized multiwall carbon nanotubes (MWCNTs). These nanocomposites have been characterized by UV-VIS, FTIR and SEM to study the effect of incorporation of MWCNTs on the morphology, structure and crystalline of the conducting polyaniline and its substitute derivate poly(o-anisidine). UV-VIS spectra shows that polaron-π* and π-π* transition bands of the PANI/POAS chain shifted to longer wavelengths, indicating the interaction between quinoid rings and MWCNTs. FTIR spectra shows that the interaction between the MWCNTs and PANI/POAS may result in ‘charge transfer’, whereby the sp2 carbons of the MWCNTs compete with dopant ions [Cl – ] and perturb the H-bond, resulting an increase in the N-H stretching intensity. Electron microscopy reveals that the interaction between the quinoid ring of PANI/POAS and the MWCNTs causes PANI and POAS polymer chains to be adsorbed at the surface of MWCNTs, thus forming a tubular core surrounding the MWCNTs. The nanocomposites showed high electrical conductivity compared to pure PANI/POAS. Further, PANI-CNT showed high electrical conductivity compared to that of POAS-CNT.
Highlights
In recent years two classes of organic materials like conducting polymers and carbon nanotubes have gained great interest for their unique physicochemical properties
We studied the standardized oxidative polymerization, carried out for the synthesis of both pure conducting polymers and related nanocomposite materials, to investigate whether the presence of dispersed carbon nanotubes (CNTs) into the medium of reaction could affect the polymer chains oxidation ratio in the final products of synthesis
As multiwall carbon nanotubes (MWCNTs) were incorporated with PANI (Fig. 1), the characteristic peaks of the PANI chain shifted to longer wavelengths, indicating the interaction between quinoid rings and MWCNTs [14]
Summary
In recent years two classes of organic materials like conducting polymers and carbon nanotubes have gained great interest for their unique physicochemical properties. His main research activities include the synthesis of advanced materials at nanoscale and use them to improve the properties of conducting polymer nanocomposites. Since the discovery by Ijima [2], carbon nanotubes (CNTs) have received much attention for their possible use in fabricating new classes of advanced material, due to their unique structural, optical, mechanical and electronic properties [3,4,5].
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