IJSRP, Volume 3, Issue 8, August 2013 Edition [ISSN 2250-3153]
Haisel Mathew, Vrinda S Punnackal, Sunny Kuriakose, B.Syamala Kumari, Ancy Manuel
Conductive polymers or, more precisely, intrinsically conducting polymers (ICPs) are organic polymers that conduct electricity. Such compounds may have metallic conductivity or can be semiconductors. Electrical conductivity of conducting polymers can be tuned from insulating to metallic through proper doping. Examples of conducting polymers include polyaniline(PANI),Polypyrrole, Polythiophene, Polyacetelyne etc. Amongst the family of conducting polymers, PANI is unique due to its ease of synthesis, environmental stability, and simple doping/dedoping chemistry. They can offer high electrical conductivity through proper doping.Making PANI with suitable materials is another method to enhance it’s conductivity.Multiwalled Carbon Nanotube is one such highly pursued material due to its high electrical conductivity,mechanical strength and thermal stability. In the present work, PANI-MWCNT composite is prepared using Hyrochloric acid(HCL) & Camphor sulphonic acid(CSA) as dopants&compared it’s d.c. conductivity with PANI prepared using HCL &CSA as dopants.The FTIR, XRD& SEM analysis of the samples were done. PANI-MWCNT composite showed good conductivity compared to PANI samples.In the case of composite, aniline molecules are polymerized in the special gaps between MWCNT bundles.They are absorbed at the surface of MWCNTs&subsequently polymerized.The MWCNT may serve as conducting bridges connecting the isolated PANI.The sample prepared with HCL as dopant showed more conductivity than that of the sample prepared using CSA. Comparatively higher d.c. conductivity of HCL doped sample may be due to the presence of lighter dopant ions ie CI—ions in HCL.The light weight CI-- ions have greater mobility than SO3--- ions in CSA.