Home > Publications database > Structural properties and thermal stability of cobalt- and chromium-doped $\mathrm{\alpha-MnO_{2}}$ nanorods > print

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024 7 _ |a 10.3762/bjnano.8.104
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100 1 _ |a Cerc Korošec, Romana
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245 _ _ |a Structural properties and thermal stability of cobalt- and chromium-doped $\mathrm{\alpha-MnO_{2}}$ nanorods
260 _ _ |a Frankfurt, M.
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|b Beilstein-Institut zur Förderung der Chemischen Wissenschaften
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520 _ _ |a $\alpha$-MnO$_{2}$ nanorods were synthesized via the hydrothermal decomposition of KMnO$_4$ in an acidic environment in the presence of Co$^{2+}$ and Cr$^{3+}$ ions. Reactions were carried out at three different temperatures: 90, 130 and 170 °C. All prepared samples exhibit a tetragonal MnO$_2$ crystalline phase. SEM–EDS analysis shows that cobalt cations are incorporated to a higher degree into the MnO$_2$ framework than chromium ions, and that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co$^{2+}$ to Co$^{3+}$ during the reaction was proved by an XANES study, while EXAFS results confirm that both dopant ions substitute Mn$^{4+}$ in the center of an octahedron. The K/Mn ratio in the doped samples synthesized at 170 °C is significantly lower than in the undoped samples. Analysis of an individual cobalt-doped $\alpha$-MnO$_{2}$ nanorod with HAADF-STEM reveals that the distribution of cobalt through the cross-section of the nanorod is uniform. The course of thermal decomposition of the doped nanorods is similar to that of the undoped ones. Dopant ions do not preserve the MnO$_2$ phase at higher temperatures nor do they destabilize the cryptomelane structure.
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700 1 _ |a Umek, Polona
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700 1 _ |a Gloter, Alexandre
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700 1 _ |a Padežnik Gomilšek, Jana
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700 1 _ |a Bukovec, Peter
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773 _ _ |a 10.3762/bjnano.8.104
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