DOI QR코드

DOI QR Code

Synthesis of Monodispersed and Spherical $SiO_2-coated Fe_2O_3$ Nanoparticle


Abstract

The preparation of nanocrystalline hematite, ${\alpha}-Fe_2O_3$, paricles and their surface coating with silica layers are described. The hematite particles with the size of 30~60 nm are firstly prepared by thermal decomposition of trinuclear acetate-hydroxo iron (III) nitrate complex, $[Fe_3$(OCOCH_3)_7$OH${\cdot}$2H_2O]NO_3$, at $400^{\circ}C$. Subsequently the hematite surfaces are coated with siliva layers by a controlled hydrolysis and condensation reaction of TEOS with varying the TEOS concentration and pH. Monodispersed and spherical $SiO_2-coatedFe_2O_3$ particles with the average particle diameter of ~90 nm and extremely narrow size distribution can be obtained at the pH of 11 and the TEOS concentration of 0.68M, which are found to be the optimum conditions in the present study in achieving the homogeneous deposition of silica layers on hematite surfaces. Diffuse reflectance UV-Vis spectra reveal that the characteristic optical reflectance of ${\alpha}-Fe_2O_3$ particles is preserved almost constant even after coating the surfaces, suggesting that the $SiO_2$ layers can be regarded as protecting layers without degrading the optical properties of hematite particles.

Keywords

References

  1. The Iron Oxides Cornell, R. M.;Schwertmann, U.
  2. J. Colloid Interface Sci. no.63 Matijevic, E.;Scheiner, P.
  3. J. Colloid Inter-face Sci. no.156 Sugimoto, T.;Sakata, K.;Muramatsu, A.
  4. J. Colloid Interface Sci. no.212 Babes, L.;Denizo, B.;Tanguy, G.;Jeune, J. J.;Jallet, P.
  5. J. Eur. Ceram. Soc. no.18 Matijevic, E.
  6. Colloids and Surfaces A no.134 Sugimoto, T.;Wang, Y.;Itoh, H.;Muramatsu, A.
  7. J. Colloid Interface Sci. no.102 Ozaki, M.;Kratohvil, S.;Matijevic, E.
  8. Colloids and Surfaces A no.109 Sugimoto, T.;Waki, S.;Itoh, H.;Muramatsu, A.
  9. J. Am. Ceram. Soc. no.82 Kominami, H.;Onoue, S.;Matsuo, K.;Kera, Y.
  10. J. Mater. Res. no.14 Liu, X.;Ding, J.;Wang, J.
  11. J. Electrochem. Soc. no.143 Ohno, K.;Kusunoki, T.
  12. J. Colloid Interface Sci. no.150 Ohmori, M.;Matijevic, E.
  13. J. Mater. Chem. no.6 Chaneac, C.;Tronc, E.;Jolivet, J. J.
  14. Langmuir no.13 Monte, F.;Morales, M. P.;Levy, D.;Fernandez, A.;Ocana, M.;Roig, A.;Molins, E.;O’Grady, K.;Serna, C. J.
  15. Chem. Mater. no.10 Ennas, G.;Musinu, A.;Piccaluga, G.;Zedda, D.;Gattes-chi, D.;Sangregorio, C.;Stanger, J. L.;Concas, G.;Spano, G.
  16. Chem. Mater. no.10 Liu, Q.;Xu, Z.;Finch, J. A.;Egerton, R.
  17. J. Colloid Interface Sci. no.217 Wang, G.;Harrison, A.
  18. J. Inorg. Nucl. Chem. no.13 Stark, K.
  19. J. Phys. Chem. no.82 Barr, T. L.
  20. J. C. S. Dalton Trans. Allen, G. C.;Curtis, M. T.;Hooper, A. J.;Tucker, P. M.

Cited by

  1. Silicon oxide in an iron(III) oxide matrix: the sol–gel synthesis and characterization of Fe–Si mixed oxide nanocomposites that contain iron oxide as the major phase vol.331, pp.1, 2003, https://doi.org/10.1016/j.jnoncrysol.2003.08.068
  2. Phase transformation of β-Fe2O3 hollow nanoparticles vol.62, pp.4, 2008, https://doi.org/10.1016/j.matlet.2007.08.073
  3. Biosurfactant-enhanced immobilization of hydrocarbon-oxidizing Rhodococcus ruber on sawdust vol.97, pp.12, 2000, https://doi.org/10.1007/s00253-013-4869-y
  4. Effect of nucleating agents and stabilisers on the synthesis of Iron-Oxide Nanoparticles-XRD analysis vol.3, pp.3, 2000, https://doi.org/10.12989/anr.2015.3.3.169
  5. Dispersion Characteristics of α-Fe2O3 Nanopowders Coated with Titanium Dioxide by Atomic Layer Deposition vol.54, pp.2, 2000, https://doi.org/10.4191/kcers.2017.54.2.04