Biomineralization Strategy to α-Mn₂O₃Hierarchical Nanostructures

Abstract

Here, we report on the synthesis of α-Mn 2 O 3 complex nanostructures through heattreatment 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 Neél 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°.

MnOx Nanoparticle-Dispersed CeO2 Nanocubes: A Remarkable Heteronanostructured System with Unusual Structural Characteristics and Superior Catalytic Performance

“…Additionally, a broad peak was found at ∼637 cm −1 for the MnO x /CeO 2 sample, which can be assigned to α-Mn 2 O 3 . 37,49,50 The F 2g band of CeO 2 cubes is changed significantly after the addition of MnO x (inset of Figure 3B). In particular, the F 2g band of the MnO x /CeO 2 sample is shifted toward lower wavenumbers with respect to CeO 2 cubes.…”

Ultrathin amorphous manganese dioxide nanosheets synthesized with controllable width

“…2 nm. 20,22 Due to the low dimensionality of the atomically thin layers, it is largely unsuitable to extract crystallographic information by using methods such as XRD. As a result, small sheets grow into large particles with rod or sheet morphology (Fig.…”

Preparation of Mn2O3 nanostructures with different shapes by a simple solid-state method

“…Two peaks centered at 612 and 529 cm -1 may correspond to the asymmetric and symmetric Mn-O-Mn stretching vibrations, respectively. The peak position at 406 cm -1 is assigned to the Mn-O-Mn bending vibration [26]. This spectrum has no characteristic peaks of impurities or other precursor compounds.…”