Effect of Organic Solvents on Iron Oxide Nanoparticles by the Solvothermal Method

Abstract

γ-Iron oxide nanoparticles were produced by the solvothermal method at 250-300 °C. Phase identification, crystal size analysis, and morphology were performed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The influences of iron(III) acetylacetonate concentration and reaction time on nanoparticles suggested differences in the crystallization pathway of products prepared in 1,4-butanediol and in toluene. Iron oxides prepared in 1,4-butanediol have been proposed to crystallize and precipitate from glycoxide, while those prepared in toluene are obtained by thermal decomposition of iron(III) acetylacetonate. The calcinations of nanoparticles at 350 °C indicated that iron oxides prepared in 1,4-butanediol have a higher thermal stability than those prepared in toluene due to phase transformation from γ-to R-iron oxides in samples prepared in toluene.

The Role of Metallic Fe and Carbon Matrix in Fe[sub 2]O[sub 3]/Fe/Carbon Nanocomposite for Lithium-Ion Batteries

“…This result illustrates that ␣-Fe 2 O 3 is the more stable phase at higher temperatures. [22][23][24][25] The literature also reads that the low temperature stable ␥-Fe 2 O 3 is converted to ␣-Fe 2 O 3 at 400°C under ambient pressure, 26 which is consistent with the temperature-dependent phase evolution observed in this work. Finally, the commercial nano-Fe 2 O 3 powder ͑sample A͒ is mainly the ␥-phase ͑Fig.…”

New evidences of in situ laser irradiation effects on γ‐Fe2O3 nanoparticles: a Raman spectroscopic study

“…the preparation method, preparation conditions, etc. [7,8] The purposes of the present study are (1) to investigate the physical mechanisms associated with the phase transition of γ -Fe 2 O 3 nanoparticles induced by laser irradiation and (2) to correlate the local structure modifications quantitatively with the evolution of vibrational spectra using the sensitivity of Raman spectroscopy and a baseline profile analysis approach.…”

Formation mechanism and magnetic properties of three different hematite nanostructures synthesized by one-step hydrothermal procedure

“…As a result, considerable attention has been drawn to the controlled synthesis of hematite particles in recent years. Up to date, hematite with one-dimensional (1D) [1, [11][12][13][14][15][16][17][18][19][20], particle-like [21][22][23], plate-shaped [24], acicular [25], airplane-like [26], shuttle-like, [27,28] dendritic, flower-like, urchin-like, and cantaloupe-like superstructures have been synthesized [29][30][31]. Hematite nanocubes [32], tube-in-tube nanostructures [33], and hollow spheres [34] have also been reported.…”