Herein we report crystal growth control of rod-shaped ε-FeO nanocrystals by developing a synthesis based on the sol-gel technique using β-FeO(OH) as a seed in the presence of a barium cation. ε-FeO nanocrystals are obtained over a wide calcination temperature range between 800 °C and 1000 °C. A low calcination temperature (800 °C) provides an almost cubic rectangular-shaped ε-FeO nanocrystal with an aspect ratio of 1.4, whereas a high calcination temperature (1000 °C) provides an elongated rod-shaped ε-FeO nanocrystal with an aspect ratio of 3.3. Such systematic anisotropic growth of ε-FeO is achieved due to the wide calcination temperature in the presence of barium cations. The surface energy and the anisotropic adsorption of barium on the surface of ε-FeO can explain the anisotropic crystal growth of rod-shaped ε-FeO along the crystallographic -axis. The present work may provide important knowledge about how to control the anisotropic crystal shape of nanomaterials.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057426 | PMC |
| http://dx.doi.org/10.1039/d0ra07256g | DOI Listing |
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