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From wustite to hematite: thermal transformation of differently sized iron oxide nanoparticles in air

  • Aladin UllrichEmail author
  • Niklas Rölle
  • Siegfried Horn
Research Paper
  • 78 Downloads

Abstract

We have investigated the oxidation behavior of iron oxide nanoparticles in air at elevated temperatures. By wet chemical synthesis under reducing conditions, polycrystalline iron oxide nanoparticles of different sizes were produced. The samples were characterized by x-ray diffraction and transmission electron microscopy. The freshly prepared particles show dominantly the wustite phase and, in addition, one or both of the spinel-like phases maghemite or magnetite. The hematite phase is absent. By annealing under air at different temperatures, we observe a successive transformation of the initial phases to phases of higher oxidation state, until the samples consist completely of the hematite phase. During this transformation, the relative amount and the evolution of the crystallite sizes of the different phases are in the focus of the investigation. We found that the maximum temperature required for a full conversion into the hematite phase depends on the particle size and increases for the larger particles. At the same time, the average crystallite size of the large particles decreases during the initial annealing procedure, passing through a minimum, before increasing again until single crystalline particles are formed.

Keywords

Nanoparticle Iron oxide Hematite Wustite Magnetite Maghemite Phase transformation High temperatures 

Notes

Author contributions

AU: concept, phase analysis, TEM.

NR: sample preparation, XRD measurements.

SH: discussing scientific content.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

References

  1. Armijo LM, Brandt YI, Mathew D, Yadav S, Maestas S, Rivera AC, Cook NC, Withers NJ, Smolyakov GA, Adolphi NL, Monson TC, Huber DL, Smyth HDC, Osiński M (2012) Iron oxide nanocrystals for magnetic hyperthermia applications. Nanomaterials 2:134–146CrossRefGoogle Scholar
  2. Bean CP, Livingston JD (1959) Superparamagnetism. J Appl Phys 30(4):120S–129SCrossRefGoogle Scholar
  3. Berkowitz AE, Schuele WJ, Flanders PF (1968) Influence of crystallite size on the magnetic properties of acicular γ-Fe2O3 partic1es. J Appl Phys 39:1261–1263CrossRefGoogle Scholar
  4. Chen CJ, Chiang RK, Lai HY, Lin CR (2010) Characterization of monodisperse wüstite nanoparticles following partial oxidation. J Phys Chem C 114:4258–4263CrossRefGoogle Scholar
  5. Cornell RM, Schwertmann U (2003) The iron oxides: "structure, properties, reactions, occurrence and uses", 2nd edn. VCH, WeinheimCrossRefGoogle Scholar
  6. Dutz S, Hergt R (2013) Magnetic nanoparticle heating and heat transfer on a microscale: basic principles, realities and physical limitations of hyperthermia for tumour therapy. Int J Hyperth 29(8):790–780CrossRefGoogle Scholar
  7. Fang C, Zhang M (2009) Multifunctional magnetic nanoparticles for medical imaging applications. J Mat Chem 19:6258–6266CrossRefGoogle Scholar
  8. Huang WC, Lyu LM, Yang YC, Huang MH (2012) Synthesis of Cu2O nanocrystals from cubic to rhombic dodecahedral structures and their comparative photocatalytic activity. J Am Chem Soc 134:1261–1267CrossRefGoogle Scholar
  9. Janzen C, Knipping J, Rellinghaus B, Roth P (2003) Formation of silica-embedded iron-oxide nanoparticles in low-pressure flames. J Nanopart Res 5:589–596CrossRefGoogle Scholar
  10. Kovalenko MV, Bodnarchuk MI, Lechner RT, Hesser G, Schäffler F, Heiss W (2007) Fatty acid salts as stabilizers in size- and shape-controlled nanocrystal synthesis. J Am Chem Soc 129:6352–6353CrossRefGoogle Scholar
  11. Krispin M, Ullrich A, Horn S (2012) Crystal structure of iron-oxide nanoparticles synthesized from ferritin. J Nanopart Res 14:669–680CrossRefGoogle Scholar
  12. Li P, Miser DE, Rabiei S, Yadav RT, Hajaligol MR (2003) The removal of carbon monoxide by iron oxide nanoparticles. Applied Catalysis B 43:151–162CrossRefGoogle Scholar
  13. Li S, Jiang ZH, Jiang Q (2008) Thermodynamic phase stability of three nano-oxides. Mater Res Bull 43:3149–3154CrossRefGoogle Scholar
  14. Liang S, Teng F, Bulgan G, Zong R, Zhu Y (2008) Effect of phase structure of MnO2 nanorod catalyst on the activity for CO oxidation. J Phys Chem C 112:5307–5315CrossRefGoogle Scholar
  15. Mendili YE, Bardeau JF, Randrianantoandro N, Grasset F, Greneche JM (2012) Insights into the mechanism related to the phase transition from γ-Fe2O3 to α-Fe2O3 nanoparticles induced by thermal treatment and laser irradiation. J Phys Chem C 116:23785–23792CrossRefGoogle Scholar
  16. Park J, An K, Hwang Y, Park JG, Noh HJ, Kim JY, Park JH, Hwang NM, Hyeon T (2004) Ultra-large-scale syntheses of monodisperse nanocrystals. Nat Mater 3:891–895CrossRefGoogle Scholar
  17. Poizot P, Laruelle S, Grugeon S, Dupont L, Tarascon JM (2000) Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries. Nature 407:496–499CrossRefGoogle Scholar
  18. Scherrer P (1918) Bestimmung der Größe und der inneren Struktur von Kolloidteilchen mittels Röntgenstrahlen. Göttinger Nachrichten 2:98–100Google Scholar
  19. Shavel A, Liz-Marzán LM (2009) Shape control of iron oxide nanoparticles. Phys Chem Chem Phys 11:3762–3766CrossRefGoogle Scholar
  20. Vasilevskaia AK, Popkov VI, Valeeva AA, Rempel AA (2016) Formation of nonstochiometric titanium oxides nanoparticles TinO2n-1 upon heat-treatments of titanium hydroxide and anatase nanoparticles in a hydrogen flow. Russ J Appl Chem 89:1211–1220CrossRefGoogle Scholar
  21. Wetterskog E, Agthe M, Mayence A, Grins J, Wang D, Rana S, Ahniyaz A, Salazar-Alvarez G, Bergström L (2014) Precise control over shape and size of iron oxide nanocrystals suitable for assembly into ordered particle arrays. Sci Technol Adv Mater 15:055010CrossRefGoogle Scholar
  22. Yavuz CT, Mayo JT, Suchecki C, Wang J, Ellsworth AZ, D’Couto H, Quevedo E, Prakash A, Gonzalez L, Nguyen C, Kelty C, Colvin VL (2010) Pollution magnet: nano-magnetite for arsenic removal from drinking water. Environ Geochem Health 32:327–334CrossRefGoogle Scholar
  23. Ye X, Lin D, Jiao Z, Zhang L (1998) The thermal stability of nanocrystalline maghemite Fe2O3. J Phys D Appl Phys 31:2739–2744CrossRefGoogle Scholar

Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Institute of PhysicsUniversity of AugsburgAugsburgGermany

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