TY  - JOUR
AU  - Cerc Korošec, Romana
AU  - Umek, Polona
AU  - Gloter, Alexandre
AU  - Padežnik Gomilšek, Jana
AU  - Bukovec, Peter
TI  - Structural properties and thermal stability of cobalt- and chromium-doped α−MnO<sub>2</sub> nanorods
JO  - Beilstein journal of nanotechnology
VL  - 8
SN  - 2190-4286
CY  - Frankfurt, M.
PB  - Beilstein-Institut zur Förderung der Chemischen Wissenschaften
M1  - PUBDB-2017-09669
SP  - 1032 - 1042
PY  - 2017
AB  - α-MnO<sub>2</sub>  nanorods were synthesized via the hydrothermal decomposition of KMnO<sub>4</sub> in an acidic environment in the presence of Co<sup>2+</sup> and Cr<sup>3+</sup> ions. Reactions were carried out at three different temperatures: 90, 130 and 170 °C. All prepared samples exhibit a tetragonal MnO<sub>2</sub> crystalline phase. SEM–EDS analysis shows that cobalt cations are incorporated to a higher degree into the MnO<sub>2</sub> framework than chromium ions, and that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co<sup>2+</sup> to Co<sup>3+</sup> during the reaction was proved by an XANES study, while EXAFS results confirm that both dopant ions substitute Mn<sup>4+</sup> 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 α-MnO<sub>2</sub>  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<sub>2</sub> phase at higher temperatures nor do they destabilize the cryptomelane structure.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000406241500001
C6  - pmid:28546897
DO  - DOI:10.3762/bjnano.8.104
UR  - https://bib-pubdb1.desy.de/record/390612
ER  -