Polyol synthesis of (polyvinylpyrrolidone) PVP-Mn3O4 nanocomposite
2010 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 502, no 1, 199-205 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 502, no 1, 199-205 p.
Nanocomposite, Nanomagnetic materials, ac conductivity, Magnetization
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-29463DOI: 10.1016/j.jallcom.2010.04.143ISI: 000280066500041ScopusID: 2-s2.0-77954216243OAI: oai:DiVA.org:kth-29463DiVA: diva2:395920
FunderKnut and Alice Wallenberg Foundation, UAW2004.0224
QC 201102082011-02-082011-02-022011-02-08Bibliographically approved