caa a22 4500 445828536 CHVBK 20180317145306.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10854-010-0262-0 doi (NATIONALLICENCE)springer-10.1007/s10854-010-0262-0 Raman spectroscopy and AC conductivity of polyaniline montmorillonite (PANI-MMT) nanocomposites [Elektronische Daten] [Abdul Shakoor, Tasneem Rizvi, Ahmad Nawaz] A series of polyaniline/montmorillonite clay (PANI-MMT) nanocomposites were synthesised by in situ polymerisation of aniline in acidic medium in the presence of varying amounts (from 1 to 30 wt%) of MMT and a substoichiometric amount of ammonium persulfate (APS). For a preferred molar ratio of monomer to oxidant of 2:1, the aniline was polymerised and largely incorporated into the MMT. The PANI-MMT nanocomposites were characterised and compared by wide-angle powder X-ray diffraction and UV-Vis spectroscopy. Raman spectroscopy was used to investigate the interaction between clay layers and the intercalated polymer chains. Room temperature AC conductivity was measured in the frequency range 30Hz to 1MHz. Pure PANI and all the composites exhibited a low frequency region of frequency independent AC conductivity followed by a high frequency dispersive region where the AC conductivity obeyed a fractional power law of frequency dependence. The fractional exponent n for all the nanocomposites is significantly high as compared to that of pure PANI; n=0.9 for all the composites whereas for pure PANI n=0.2. In pristine PANI the onset of the dispersive region ω c is at a much higher frequency (at 300kHz) as compared to the nanocomposites in which ω c is about 10kHz. Springer Science+Business Media, LLC, 2010 Shakoor Abdul Physics Department, B.Z. University, Multan, Pakistan aut Rizvi Tasneem Physics Department, Quaid-I-Azam University, P.O. Box 45320, Islamabad, Pakistan aut Nawaz Ahmad Physics Department, Quaid-I-Azam University, P.O. Box 45320, Islamabad, Pakistan aut Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/8(2011-08-01), 1076-1080 0957-4522 22:8<1076 2011 22 10854 https://doi.org/10.1007/s10854-010-0262-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10854-010-0262-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shakoor Abdul Physics Department, B.Z. University, Multan, Pakistan aut NATIONALLICENCE 700 1- Rizvi Tasneem Physics Department, Quaid-I-Azam University, P.O. Box 45320, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Nawaz Ahmad Physics Department, Quaid-I-Azam University, P.O. Box 45320, Islamabad, Pakistan aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/8(2011-08-01), 1076-1080 0957-4522 22:8<1076 2011 22 10854 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer