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Vol. 3 No. 1 (2011)

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

https://doi.org/10.1007/BF03353648
E. Karaoğlu
Department of Chemistry, Fatih University, 34500, B. Cekmece- Istanbul, Turkey
H. Deligöz
Chemical Engineering Department, Istanbul University, 34320, Avcilar-Istanbul, Turkey
H. Sözeri
TUBITAK-UME, National Metrology Institute, Gebze, Kocaeli, 41470, Turkey
A. Baykal
Department of Chemistry, Fatih University, 34500 B. Cekmece- Istanbul/Turkey
M. S. Toprak
Division of Functional Materials, Royal Institute of Technology, 16440 Stockholm/Sweden

Corresponding Author: E. Karaoğlu

ekaraoglu@fatih.edu.tr

Nano-Micro Letters, Vol. 3 No. 1 (2011), Article Number: 25-33

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.

Keywords

Spinels Magnetic nanomaterials Conductivity Magnetic properties Hydrothermal Synthesis
Karaoğlu, E., H. Deligöz, H. Sözeri, A. Baykal, and M. S. Toprak. 2011. “Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite”. Nano-Micro Letters 3 (1):25-33. https://doi.org/10.1007/BF03353648.
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