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- Title
Formation of polymorphs and pores in small nanocrystalline iron oxide particles.
- Authors
Levish, Alexander; Winterer, Markus
- Abstract
A novel chemical vapor synthesis reactor design is used to control the pore-particle mesostructure and investigate the pore formation mechanism through the variation of residence time in oxygen. This enables the exploitation of the Kirkendall effect at the nanoscale to generate ultrasmall pores in small nanocrystalline iron oxide particles. Detailed structural characterization and quantitative data analysis of complementary high resolution transmission electron microscopy images, X-ray diffractograms, nitrogen sorption isotherms and X-ray absorption spectra provide a consistent comprehensive picture of the hollow nanoparticles from the local to the microstructure. The pore formation mechanism seems to play a key role for β-Fe2O3 polymorph formation.
- Subjects
FERRIC oxide; IRON oxides; HIGH resolution electron microscopy; X-ray absorption spectra; IRON powder; KIRKENDALL effect; DISTRIBUTION isotherms (Chromatography)
- Publication
Scientific Reports, 2022, Vol 12, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-022-19276-4