This article reports the synthesis of Polyaniline (PANI) in emeraldine form (EB) by in-situ chemical oxidation method using different dopants and ammonium persulphate (APS) as an oxidant. The samples were characterized by FTIR, UV-Vis, and their conductivity determined by four-point probe method. Quinoid and benzenoid bands at 1553-1596 cm-1 and 1437 – 1496 cm-1 respectively where observed in all the samples. The band gaps and conductivity values for all the bulk samples were obtained using the absorption spectra and Stern relation. It was found that the transition π i- iπ* iforiPANI-H2SO4 ioccurs iearlier ithan iin iPANI-HCl isample.i This ican ionly ibe ias ia iresult iof ithe iH2SO4 iacid ibeen ia istronger iacid ithan ithe iHCl iand ias ia iresult ithe itransition ifrom iπ i- iπ* irequired ilower swavelength ifor iPANI-H2SO4 isample ias icompared ito ithe iPANI-HCl isample.iBy icomparing ithe ifour isamples ithe iπ i- iπ* itransition ithen ican ibe iarranged ifrom ithe istrongest ito ithe iweakest ias iPANI-H2SO4 ifollowed iby iPANI-HCl ithen iPANI-HNO3 iand ithe iweakest ibeing iPANI-CH3COOH. The same trend is also observed for electrical conductivity of these samples.
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