Fe-EBT Chelate Complex: A Novel Mean for Growth of α-FeOOH and γ-Fe2O3 Nanostructures

doi:10.1007/s40195-014-0141-4

Abstract

Abstract:

Acicular goethite (α-FeOOH) and worm-like maghamite (γ-Fe₂O₃) nanostructures have been prepared adopting a novel route, using Na₂[Fe(HL)₂(H₂O)₂] chelate complex in alkaline medium. It is found that concentration of hydrated Fe(III) ions increased with increasing temperature, which later play a key role in generation of different phases of iron oxide. Phase and morphology of the products are investigated using XRD, FTIR, SEM, and TEM analysis. Using UV-Vis spectra, various electronic transitions of goethite and maghamite particles are examined. Maghamite nanostructures exhibit superparamagnetic property at room temperature. On the basis of experimental observations and analytical data, growth mechanism of the nanostructures is discussed.

Key words: Iron oxide, Nanostructures, Chemical synthesis, Growth mechanism, Magnetic properties

Pandey Gajanan. Fe-EBT Chelate Complex: A Novel Mean for Growth of α-FeOOH and γ-Fe₂O₃ Nanostructures[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(6): 1127-1133.

Figures/Tables 8

Fig. 1 XRD patterns of as-prepared α-FeOOH a and γ-Fe2O3 b nanostructures

Fig. 2 FTIR spectra of a α-FeOOH and γ-Fe2O3 materials; b magnified view of FTIR spectra

Fig. 3 a, b SEM images of as-prepared α-FeOOH; c-e TEM images of as-prepared α-FeOOH nanostructures

Fig. 4 a SEM image of as-prepared γ-Fe2O3; b-d TEM images of as-prepared γ-Fe2O3 nanostructures

Fig. 5 UV-Vis absorption spectra of as-synthesised α-FeOOH and γ-Fe2O3 materials

Fig. 6 Room temperature magnetic hysteresis loops of γ-Fe2O3

Fig. 7 Enol-azo and keto-hydrazone forms of the ligand H2L-

Fig. 8 Structure of Na2[Fe(HL)2(H2O)2] chelate complex

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Fe-EBT Chelate Complex: A Novel Mean for Growth of α-FeOOH and γ-Fe₂O₃ Nanostructures

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