Biomineralization Strategy to α-Mn2O3Hierarchical Nanostructures

Here, we report on the synthesis of α-Mn 2 O 3 complex nanostructures through heat-treatment of the precursor MnCO 3 (in similar structure and size) synthesized by a biomineralization route. The phase, microstructure, and morphology of the obtained sample were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectrum, Raman spectrum, and scanning electron microscopy (SEM). The self-assembly mechanism of the precursor of MnCO 3 is discussed. The α-Mn 2 O 3 show two weak antiferromagnetic transition Néel temperatures at ∼78.3 and ∼15.8 K and a Curie–Weiss temperature at 48.5 K. Also, the α-Mn 2 O 3 hierarchical nanostructures present superhydrophobicity with a contact angle over 150°.