Abstract
Abstract Here, we report on the synthesis of PEG-Mn3O4 nanocomposite (NP’s) via a hydrothermal route by using Mn(acac)2, ethanol, NH3 and PEG-400. The crystalline phase was identified as Mn3O4. The crystallite size of the PEG-Mn3O4 nanocomposite was calculated as 12±5 nm from X-ray line profile fitting and the average particle size from TEM was obtained as 200 nm. This reveals polycrystalline character of Mn3O4 NP’s. The interaction between PEG-400 and the Mn3O4 NP’s was investigated by FTIR. Temperature independent AC conductivity of PEG-Mn3O4 nanocomposite beyond 20 kHz provides a strong evidence of ionic conduction through the structure. The conductivity and permittivity measurements strongly depend on the secondary thermal transition of nanocomposite beyond 100°C. Above that temperature, Mn3O4 particles may interact with each other yielding a percolated path that will facilitate the conduction. On the other hand, the relatively lower activation energy (Ea=0.172 eV) for relaxation process suggests that polymer segmental motions of PEG and electrons hopping between Mn2+ and Mn3+ may be coupled in the sample below 100°C. Room temperature magnetization curve of the sample does not reach to a saturation, which indicates the superparamagnetic character of the particles. As the temperature increases, the frequency at which (ε″) reaches a maximum shifted towards higher frequencies. The maximum peak was observed at 1.4 kHz for 20°C while the maximum was detected at 23.2 kHz for 90°C.
Highlights
IntroductionManganese oxide (Mn3O4) as a magnetic transition-metal oxide is an important material
Among magnetic nanoparticles, manganese oxide (Mn3O4) as a magnetic transition-metal oxide is an important material
The average crystallite size D was obtained as 12 ± 5 nm as a result of this line profile fitting
Summary
Manganese oxide (Mn3O4) as a magnetic transition-metal oxide is an important material. The addition of PEG in the metal oxide colloids will modify the growth kinetics of the growing colloids, which leads to anisotropic growth of the crystals For this reason, linear PEG has been widely used in the synthesis of a series of nanoparticulates and 1D materials in solution [22]. The electrical characterizations, AC conductivity and dielectric properties of PEG-Mn3O4 nanocomposite were measured by using Novocontrol dielectric impedance analyzer in the frequency range of 1 Hz∼3 MHz. The samples were used in the form of circular pellets of 13 mm diameter and 3 mm thickness and the pellets were sandwiched between gold electrodes (two probe through plane). The dielectric data (ε and ε ) were collected during heating as a function of frequency
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