Indian Journal of Pure and Applied Physics

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Structural, DC Conductivity and Electric Modulus Studies of Polypyrrole Praseodymium Manganite Nanocomposites


Affiliations
1 Department of Physics, Dr. Ambedkar Institute of Technology, Bengaluru 560 056, India
2 Centre of Excellence in Advanced Materials Research, Department of Physics, BMS College of Engineering, Bengaluru 560 019, India
 

Praseodymium Calcium Manganite (PCM) nanoparticles were synthesized by sol-gel method. Polypyrrole (PPy) and polypyrrole–praseodymium manganite nanocomposites (PPy/PCM) were synthesized by in-situ chemical polymerization method. Transmission electron microscope (TEM) confirmed good crystallinity with 42-63 nm average particle size. Scanning electron microscope (SEM) exhibited well-defined core structure of PPy and the PPy/PCM nanocomposites. X-ray diffraction (XRD) patterns of PPy showed amorphous nature and those of composites showed semicrystalline nature. UV-Vis spectroscopy was used to study the energy band gap for all the nanocomposites and hence they may find a place in wide band gap applications. The UV (231nm) and visible (363 nm and 377 nm) emissions were observed from the spectrum. DC conductivity was studied from 473 to 303 K for all the nanocomposites and found that conduction is of semiconductor type. Analysis of electric modulus confirmed the contribution from grain and grain boundary, non-Debye type relaxation and dc conductivity obeyed Correlated Barrier Hopping (CBH) model.

Keywords

Polypyrrole/Praseodymium Manganite, Nanocomposites, DC Conductivity, Electric Modulus.
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  • Structural, DC Conductivity and Electric Modulus Studies of Polypyrrole Praseodymium Manganite Nanocomposites

Abstract Views: 121  |  PDF Views: 100

Authors

Meti Bharathi
Department of Physics, Dr. Ambedkar Institute of Technology, Bengaluru 560 056, India
K N Anuradha
Department of Physics, Dr. Ambedkar Institute of Technology, Bengaluru 560 056, India
M V Murugendrappa
Centre of Excellence in Advanced Materials Research, Department of Physics, BMS College of Engineering, Bengaluru 560 019, India

Abstract


Praseodymium Calcium Manganite (PCM) nanoparticles were synthesized by sol-gel method. Polypyrrole (PPy) and polypyrrole–praseodymium manganite nanocomposites (PPy/PCM) were synthesized by in-situ chemical polymerization method. Transmission electron microscope (TEM) confirmed good crystallinity with 42-63 nm average particle size. Scanning electron microscope (SEM) exhibited well-defined core structure of PPy and the PPy/PCM nanocomposites. X-ray diffraction (XRD) patterns of PPy showed amorphous nature and those of composites showed semicrystalline nature. UV-Vis spectroscopy was used to study the energy band gap for all the nanocomposites and hence they may find a place in wide band gap applications. The UV (231nm) and visible (363 nm and 377 nm) emissions were observed from the spectrum. DC conductivity was studied from 473 to 303 K for all the nanocomposites and found that conduction is of semiconductor type. Analysis of electric modulus confirmed the contribution from grain and grain boundary, non-Debye type relaxation and dc conductivity obeyed Correlated Barrier Hopping (CBH) model.

Keywords


Polypyrrole/Praseodymium Manganite, Nanocomposites, DC Conductivity, Electric Modulus.

References