In addition, the manganese oxide nanocrystals have been prepared
under different condition (Table 1). By controlling the quality
of nanocrystals, Mn2O3 with various sizes can be formed.
[Mn(O4C2)2H2O] (sample 1) was calcined at 450 C for 6 h, in this
case Mn2O3 with particle size about 50 nm and irregular shapes
was obtained. We decided to use of solvent for preparing manganese
oxides with small particle size and use of low reaction temperature
so, 0.6 g of [Mn(O4C2)2H2O] and 5 mL of oleylamine,
(sample 2), was mixed and heated in 150 C for 90 min so led to
agglomerated nanoparticles Mn2O3 with particle size 45–60 nm.
To prepare Mn2O3 nanobundles (sample 3), the procedure mentioned
in experimental section, including oleylamine and TPP,
was done. Considering different condition employed to prepare
these samples, it is obvious that using both oleylamine and TPP
as capping agent is preferred for Mn2O3 nanobundles synthesis.