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Title:Structural properties and thermal stability of cobalt- and chromium-doped αMnO2 nanorods
Authors:ID Cerc Korošec, Romana (Author)
ID Umek, Polona (Author)
ID Gloter, Alexandre (Author)
ID Padežnik Gomilšek, Jana (Author)
ID Bukovec, Peter (Author)
Files:.pdf 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
 
URL http://www.beilstein-journals.org/bjnano/content/8/1/104
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:αMnO2 nanorods were synthesized via the hydrothermal decomposition of KMnO4 in an acidic environment in the presence of Co2+ and Cr3+ ions. Reactions were carried out at three different temperatures: 90, 130 and 170 °C. All prepared samples exhibit a tetragonal MnO2 crystalline phase. SEM–EDS analysis shows that cobalt cations are incorporated to a higher degree into the MnO2 framework than chromium ions, and that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co2+ to Co3+ during the reaction was proved by an XANES study, while EXAFS results confirm that both dopant ions substitute Mn4+ 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 αMnO2 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 MnO2 phase at higher temperatures nor do they destabilize the cryptomelane structure.
Keywords:αMnO2, manganese dioxide, doping, EXAFS, nanorods, XANES
Publication status:Published
Publication version:Version of Record
Year of publishing:2017
Number of pages:str. 1032-1042
Numbering:Letn. 8
PID:20.500.12556/DKUM-67303 New window
ISSN:2190-4286
UDC:546.711-31:620.3
ISSN on article:2190-4286
COBISS.SI-ID:1537419971 New window
DOI:10.3762/bjnano.8.104 New window
NUK URN:URN:SI:UM:DK:1M6PJSNJ
Publication date in DKUM:10.08.2017
Views:1556
Downloads:445
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
CERC KOROŠEC, Romana, UMEK, Polona, GLOTER, Alexandre, PADEŽNIK GOMILŠEK, Jana and BUKOVEC, Peter, 2017, Structural properties and thermal stability of cobalt- and chromium-doped $α-MnO_2$ nanorods. Beilstein Journal of Nanotechnology [online]. 2017. Vol. 8, p. 1032–1042. [Accessed 21 January 2025]. DOI 10.3762/bjnano.8.104. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=67303
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Record is a part of a journal

Title:Beilstein Journal of Nanotechnology
Shortened title:Beilstein J. Nanotechnol.
Publisher:Beilstein-Institut
ISSN:2190-4286
COBISS.SI-ID:25644839 New window

Document is financed by a project

Funder:EC - European Commission
Funding programme:FP7
Project number:312284
Name:Coordinated Access to Lightsources to Promote Standards and Optimization
Acronym:CALIPSO

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:10.08.2017

Secondary language

Language:Slovenian
Keywords:αMnO2, manganov dioksid, dopiranje, EXAFS, nanopalčke, XANES


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