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Polyol synthesis of (polyvinylpyrrolidone) PVP-Mn3O4 nanocomposite
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2010 (Engelska)Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 502, nr 1, s. 199-205Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report on the synthesis of (polyvinylpyrrolidone) PVP-Mn3O4 nanocomposite via a polyol route. Crystalline phase was identified as Mn3O4 and the crystallite size was obtained as 6 +/- 1 nm from X-ray line profile fitting. Average particle size of 6.1 +/- 0.1 nm obtained from TEM analysis reveals nearly single crystalline nature of these nanoparticles in the composite. The capping of PVP around Mn3O4 nanoparticles was confirmed by FT-IR spectroscopy, the interaction being via bridging oxygens of the carbonyl (C=O) and the nanoparticle surface. T-C and T-B for PVP-Mn3O4 nanocomposite were observed at 42K and 28.5 K, respectively. The sample has hysteresis with small coercivity and remanent magnetization at 40K, resembling the superparamagnetic state. ac conductivity measurements on PVP-Mn3O4 nanocomposite revealed a conductivity in the order of 10(-7) S cm(-1) at lower frequencies. The conductivity change with respect to frequency can be explained by electronic exchange occurring between Mr(+2) and Mn+3 existing in sublattice of spinel lattice.

Ort, förlag, år, upplaga, sidor
2010. Vol. 502, nr 1, s. 199-205
Nyckelord [en]
Nanocomposite, Nanomagnetic materials, ac conductivity, Magnetization
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-29463DOI: 10.1016/j.jallcom.2010.04.143ISI: 000280066500041Scopus ID: 2-s2.0-77954216243OAI: oai:DiVA.org:kth-29463DiVA, id: diva2:395920
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, UAW2004.0224
Anmärkning
QC 20110208Tillgänglig från: 2011-02-08 Skapad: 2011-02-02 Senast uppdaterad: 2017-12-11Bibliografiskt granskad

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Toprak, Muhammet S.

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Funktionella material, FNM
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Journal of Alloys and Compounds
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