Thermal transition behaviour of iron oxide–polypyrrole nanocomposites

Suri, Komilla; Annapoorni, S.; Tandon, R. P.; Rath, Cody; Aggrawal, V.K.

doi:10.1016/s1567-1739(02)00203-1

Cited by 15 publications

(8 citation statements)

References 18 publications

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“…The peaks correspond to the cubic ␥-Fe 2 O 3 phase. This is also confirmed from TGA/DTA which shows more polymerization 19 as compared to the POC samples. From the micrograph we can see that the SGP samples have small particles whose size for this concentra- [This article is copyrighted as indicated in the article.…”

Section: A Characterization Studiessupporting

confidence: 74%

Magnetic relaxation studies in organic-inorganic nanoclusters

Sharma

Suri

Tandon

et al. 2006

Journal of Applied Physics

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Inorganic/organic nanocomposites of iron oxide and polypyrrole, prepared by two different techniques, namely, simultaneous gelation/polymerization and polymerization over core iron oxide particles, were investigated for their structural and magnetic properties. The presence of the polymer was confirmed by Fourier transform infrared spectroscopy. The magnetic properties were found to be very sensitive not only to the concentration of polymer but also to the method of preparation. ac susceptibility measurements performed in the temperature range of 77-300 K show the signature of superparamagnetic behavior in both the systems. The blocking temperature was found to be dependent on the cluster size and interaction effects. The frequency variation of the blocking temperature in the samples prepared by simultaneous gelation and polymerization seems to indicate weakly interacting magnetic clusters, whereas in the samples prepared by polymerization around the core oxide particles, a strongly interacting signature is seen. ac susceptibility as calculated by kinetic Monte Carlo simulations based on an interacting model for single domain particles shows a qualitative agreement with the trends observed in the experimental results.

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Section: A Characterization Studiessupporting

confidence: 74%

Magnetic relaxation studies in organic-inorganic nanoclusters

Sharma

Suri

Tandon

et al. 2006

Journal of Applied Physics

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“…Whereas only one peak was observed in the pure PPy samples, two exothermic peaks were observed in the DTA curves of the nanocomposites. These were due to the decomposition of PPy at 307°C and the possible phase transition of iron oxide at 480°C, as reported for the Fe 2 O 3 /PPy nanocomposites fabricated by the simultaneous gelation and polymerization (sol-gel) method [77,78] respectively. As compared with no obvious phase transition in the pure iron oxide nanoparticles, the observed phase transition was due to the intermediate product of PPy [77,78].…”

Section: Interaction Between the Nanoparticles And Thesupporting

confidence: 58%

Magnetic and Electron Transport Behaviors of Conductive‐Polymer Nanocomposites

Guo

Wei

Cocke

et al. 2010

Nanostructured Conductive Polymers

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“…Among them, the composites made of polypyrrole (PPy) and silver nanoparticles are the best example. Synthesis and size control of PPy nanoparticles have been studied and reported that PPy nanoparticles can be effectively dispersed due to large surface area and they exhibit good conductivity [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and AC Conductivity Studies in PPy-Ag Nanocomposites

Praveenkumar

Sankarappa

Ashwajeet

et al. 2015

Journal of Polymers

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Polypyrrole and silver nanoparticles have been synthesized at 277 K by chemical route. Nanoparticles of polypyrrole-silver (PPy-Ag) composites were prepared by mixing polypyrrole and silver nanoparticles in different weight percentages. Dielectric properties as a function of temperature in the range from 300 K to 550 K and frequency in the range from 50 Hz to 1 MHz have been measured. Dielectric constant decreased with increase in frequency and temperature. Dielectric loss decreased with increase in frequency and increased with increase in temperature. Using dielectric data AC conductivity has been determined. Conductivity was found to be in the order of 10 −3 (Ω −1 m −1 ) and it increased with increase in temperature. Temperature variation of conductivity data has been analyzed in the light of Mott's polaron hopping model. Activation energy for conduction has been determined. Activation energy was determined to be in the order of meV and it has increased with increase in frequency and Ag nanoparticles content. This is the first time that PPy-Ag nanocomposites have been investigated for dielectric properties and AC conductivity and data analyzed thoroughly.

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Thermal transition behaviour of iron oxide–polypyrrole nanocomposites

Cited by 15 publications

References 18 publications

Magnetic relaxation studies in organic-inorganic nanoclusters

Magnetic relaxation studies in organic-inorganic nanoclusters

Magnetic and Electron Transport Behaviors of Conductive‐Polymer Nanocomposites

Dielectric and AC Conductivity Studies in PPy-Ag Nanocomposites

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