Insights into the Plasma-Assisted Fabrication and
Nanoscopic Investigation of Tailored MnO2 Nanomaterials
Posted on 2018-11-08 - 17:36
Among
transition metal oxides, MnO2 is of considerable
importance for various technological end-uses, from heterogeneous
catalysis to gas sensing, owing to its structural flexibility and
unique properties at the nanoscale. In this work, we demonstrate the
successful fabrication of supported MnO2 nanomaterials
by a catalyst-free, plasma-assisted process starting from a fluorinated
manganese(II) molecular source in Ar/O2 plasmas. A thorough
multitechnique characterization aimed at the systematic investigation
of material structure, chemical composition, and morphology revealed
the formation of F-doped, oxygen-deficient, MnO2-based
nanomaterials, with a fluorine content tunable as a function of growth
temperature (TG). Whereas phase-pure β-MnO2 was obtained for 100 °C ≤ TG ≤ 300 °C, the formation of mixed phase MnO2 + Mn2O3 nanosystems took place at 400
°C. In addition, the system nano-organization could be finely
tailored, resulting in a controllable evolution from wheat-ear columnar
arrays to high aspect ratio pointed-tip nanorod assemblies. Concomitantly,
magnetic force microscopy analyses suggested the formation of spin
domains with features dependent on material morphology. Preliminary
tests in Vis-light activated photocatalytic degradation of rhodamine
B aqueous solutions pave the way to possible applications of the target
materials in wastewater purification.
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Barreca, Davide; Gri, Filippo; Gasparotto, Alberto; Altantzis, Thomas; Gombac, Valentina; Fornasiero, Paolo; et al. (2018). Insights into the Plasma-Assisted Fabrication and
Nanoscopic Investigation of Tailored MnO2 Nanomaterials. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.8b02108
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AUTHORS (7)
DB
Davide Barreca
FG
Filippo Gri
AG
Alberto Gasparotto
TA
Thomas Altantzis
VG
Valentina Gombac
PF
Paolo Fornasiero
CM
Chiara Maccato