The effects of Fe-doping on MnO2: phase transitions, defect structures and its influence on electrical properties

E. Hastuti, A. Subhan, P. Amonpattaratkit, M. Zainuri, S. Suasmoro*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

The composition of Mn1−xFexO2(x= 0-0.15) was synthesized by a hydrothermal method at 140 °C for 5 hours of reaction time. Investigations were carried out including XRD, FTIR, Raman spectroscopy, FESEM, and TEM for crystallographic phase analysis. Furthermore, XPS and XAS were used to analyze the oxidation states of Mn and dopant Fe in the octahedron sites. For electrical characterizations, an impedance analyzer was used to explore the conductivity and dielectric properties. It was discovered that the undoped MnO2possessed an α-MnO2structure performing (2 × 2) tunnel permitting K+insertion and had a nanorod morphology. The Fe ion that was doped into MnO2caused a phase transformation from α-MnO2to Ramsdellite R-MnO2afterx= 0.15 was reached and the tunnel dimension changed to (2 × 1). Furthermore, this caused increased micro-strain and oxygen vacancies. An oxidation state analysis of Mn and substituted Fe in the octahedron sites found mixed 3+ and 4+ states. Electrical characterization revealed that the conductivity of Fe-doped MnO2is potentially electron influenced by the oxidation state of the cations in the octahedron sites, the micro-strain, the dislocation density, and the movement of K+ions in the tunnel.

Original languageEnglish
Pages (from-to)7808-7823
Number of pages16
JournalRSC Advances
Volume11
Issue number14
DOIs
Publication statusPublished - 28 Jan 2021

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