Enhanced AC conductivity and dielectric relaxation properties of polypyrrole nanoparticles irradiated with Ni12+ swift heavy ions》.pdfVIP

Nuclear Instruments and Methods in Physics Research B 333 (2014) 73–79 Contents lists available at ScienceDirect Nuclear Instruments and Methods in Physics Research B journal homepage: www.else /locate/nimb Enhanced AC conductivity and dielectric relaxation properties of polypyrrole nanoparticles irradiated with Ni12+ swift heavy ions J. Hazarika, A. Kumar ⇑ Materials Research Laboratory, Department of Physics, Tezpur University, Tezpur 784028, Assam, India a r t i c l e i n f o a b s t r a c t Article history: In this paper, we report the 160 MeV Ni12+ swift heavy ions (SHIs) irradiation effects on AC conductivity Received 9 March 2014 and dielectric relaxation properties of polypyrrole (PPy) nanoparticles in the frequency range of Received in revised form 27 April 2014 42 Hz–5 MHz. Four ion fluences of 5 1010, 1 1011, 5 1011 and 1 1012 ions/cm2 have been used Accepted 28 April 2014 for the irradiation purpose. Transport properties in the pristine and irradiated PPy nanoparticles have Available online 24 May 2014 been investigated with permittivity and modulus formalisms to study the polarization effects and conductivity relaxation. With increasing ion fluence, the relaxation peak in imaginary modulus (M00 ) plots Keywords: shifts toward high frequency suggesting long range motion of the charge carriers. The AC conductivity PPy nanoparticles SHI irradiation