Abstract
Here, single-phase Mn2O3 and Mn3O4 films are successfully fabricated by a facile solution process based on metal-organic decomposition (MOD), for the first time. A formulated manganese 2-ethylhexanoate solution was used as an MOD precursor for the preparation of manganese oxide films. The difference in thermal decomposition behavior of precursor solution in air and inert atmospheres was observed, indicating that the calcination atmosphere is the main factor for controlling the valence of manganese oxide films. Significantly, the solution-coated films on substrates are found to be transformed into single-phase Mn2O3 and Mn3O4 films when they are calcinated under air and inert atmosphere, respectively. The film crystallinity was improved with increasing calcination temperature for both Mn2O3 and Mn3O4 films. In particular, it is noted that the grains of Mn2O3 film were somewhat linearly grown in air, while those of Mn3O4 film exhibited the drastic growth in Ar with an increase of calcination temperature.
Highlights
Manganese Oxide Films by Metal-Manganese oxides have drawn attention as promising energy storage materials such as rechargeable batteries and electrochemical capacitors as well as environmental catalysts [1,2,3,4,5,6,7,8,9]
Thermal decomposition behavior of the prepared manganese 2-ethylhexanoate solution has been investigated by TGA in order to determine metal-organic decomposition (MOD) processing temperature in ambient air and an inert argon (Ar) atmosphere
Such decomposition behavior hinted that the calcination atmosphere of precursor solution can be the main factor for controlling the valence of manganese oxide products
Summary
Manganese oxides have drawn attention as promising energy storage materials such as rechargeable batteries and electrochemical capacitors as well as environmental catalysts [1,2,3,4,5,6,7,8,9]. In the case of complex multicomponent oxides, the control of hydrolysis and condensation is 8 no difficult and MOD method is preferred. 2 O3 and Mn3 O4creation multivalence, the film form gains a competitive advantage in the fabricated by the facile MOD solution route, for the first time. Manganese of single-phase manganese oxides due to its low activation energy for phase transforoxides are conventionally hard to be obtained in the form of single phase because of their mation arising from high surface-to-volume ratio as well as its uniform heat transfer. Multivalence, the film form gains a competitive advantage in the homogeneous creation of Bulksingle-phase powders and fine nanoparticles have limits in preparing single phases owing manganese oxides due to its low activation energy stable for phase transformation to unequal heathigh transfer and excessive surface leading to instability in compoarising from surface-to-volume ratio as wellreactivity as its uniform heat transfer. Fine nanoparticles have limits in preparing stable single phases owing to unequal heat transfer and excessive surface reactivity leading to instability in composition and phase, respectively
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