| Title: | Structural properties and thermal stability of cobalt- and chromium-doped $α-MnO_2$ nanorods |
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| Authors: | ID Cerc Korošec, Romana (Author)
ID Umek, Polona (Author)
ID Gloter, Alexandre (Author)
ID Padežnik Gomilšek, Jana (Author)
ID Bukovec, Peter (Author) |
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| Files: |  Beilstein_Journal_of_Nanotechnology_2017_Cerc_Korosec_et_al._Structural_properties_and_thermal_stability_of_cobalt-_and_chromium-doped_α.pdf (8,24 MB)
MD5: 1711B3579EB146884854FF82B1F131AB
PID: 20.500.12556/dkum/a7c928ee-7bc4-4ff9-ab54-15f374bd7fd2
 http://www.beilstein-journals.org/bjnano/content/8/1/104
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | $α-MnO_2$ 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 $α-MnO_2$ 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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| Keywords: | $α-MnO_2$, manganese dioxide, doping, EXAFS, nanorods, XANES |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Year of publishing: | 2017 |
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| Number of pages: | str. 1032-1042 |
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| Numbering: | Letn. 8 |
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| PID: | 20.500.12556/DKUM-67303  |
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| ISSN: | 2190-4286 |
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| UDC: | 546.711-31:620.3 |
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| ISSN on article: | 2190-4286 |
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| COBISS.SI-ID: | 1537419971 |
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| DOI: | 10.3762/bjnano.8.104 |
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| NUK URN: | URN:SI:UM:DK:1M6PJSNJ |
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| Publication date in DKUM: | 10.08.2017 |
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| Views: | 1685 |
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| Downloads: | 515 |
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| Metadata: |    |
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| Categories: | Misc.
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