Polyol synthesis of (polyvinylpyrrolidone) PVP-Mn sub(3)O sub(4) nanocomposite

• Published in: Journal of alloys and compounds Vol. 502; no. 1; pp. 199 - 205
• Main Authors: Baykal, A, Bitrak, N, Unal, B, Kavas, H, Durmus, Z, Oezden, S, Toprak, MS
• Format: Journal Article
• Language: English
• Published: 16-07-2010
• Subjects: Crystal structure; Nanocomposites; Nanomaterials; Nanoparticles; Nanostructure; Polyols; Polyvinylpyrrolidone; Synthesis
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2010.04.143

We report on the synthesis of (polyvinylpyrrolidone) PVP-Mn sub(3)O sub(4) nanocomposite via a polyol route. Crystalline phase was identified as Mn sub(3)O sub(4) 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 Mn sub(3)O sub(4) nanoparticles was confirmed by FT-IR spectroscopy, the interaction being via bridging oxygens of the carbonyl (C[double bond; length as m-dash]O) and the nanoparticle surface. T sub(C) and T sub(B) for PVP-Mn sub(3)O sub(4) nanocomposite were observed at 42 K and 28.5 K, respectively. The sample has hysteresis with small coercivity and remanent magnetization at 40 K, resembling the superparamagnetic state. ac conductivity measurements on PVP-Mn sub(3)O sub(4) nanocomposite revealed a conductivity in the order of 10 super(-7) S cm super(-1) at lower frequencies. The conductivity change with respect to frequency can be explained by electronic exchange occurring between Mn super(+2) and Mn super(+3) existing in sublattice of spinel lattice.