A simple additive-free approach for the synthesis of uniform manganese monoxide nanorods with large specific surface area

Abstract

A simple additive-free approach is developed to synthesize uniform manganese monoxide (MnO) one-dimensional nanorods, in which only manganese acetate and ethanol were used as reactants. The as-synthesized MnO nanorods were characterized in detail by X-ray diffraction, scanning and transmission electron microscopy (TEM) including high-resolution TEM and selected-area electron diffraction, Fourier transform infrared spectrum, and nitrogen adsorption isotherm measurements. The results indicate that the as-synthesized MnO nanorods present a mesoporous characteristic with large specific surface area (153 m2 g−1), indicating promising applications in catalysis, energy storage, and biomedical image. On the basis of experimental results, the formation mechanism of MnO one-dimensional nanorods in the absence of polymer additives was also discussed.

Behavior of Self-assembled Mn(III)/Mn(II)-NEt3 Conjugate on Different Support Observed by AFM-SNOM

“…X-ray diffraction pattern of the yellow-green crystals has exhibited characteristic intense diffraction lines with d(Å) = 4.37; 3.29; 2.62, and 2.18 equally distanced via 2Θ = 6.9° ± 0.2° from each other. According to X-ray fluorescence analysis with an analyzer Mesa-500W (Horiba, Japan) and IR spectra its formula was found to be [Mn 2+ (Et 3 N) 3 3 according to X-ray diffraction analysis [12]. The other main part of the powder has been identified with the Mn II -NEt 3 complex isolated from supernatant according to characteristic set of diffraction lines equally distanced via 2Θ = 6.9° ± 0.2° from each other in the diffractogramme [12].…”

“…The interaction between Et 3 N and MnCl 2 in alkaline aqueous solution results in the complex with formula [Mn 2+ (Et 3 N) 3 [12]. Two different types of the particles self-assembled in the solution are usually observed by simultaneous AFM-SNOM, typical images of the first type particles are displayed in Fig.…”

“…(1), where d s is the particle diameter at the surface contact and d es is the diameter of the equivalent sphere [19]. 3 with the aqueous coordination shell, has mainly occurred in the solution due to the hydrogen bonding [12] and more likely hydrophobic interactions too. The latter play the determinative role in the larger particles selfassembling and the submicroscopic core, which is retained on hydrophilic mica surface as displayed in Fig.…”

“…As mentioned above the white-gel precipitate is the conjugate formed between kempite structural analog, Mn 2 Cl(OH) 3 and complex including hydronium ion, [Mn 2+ (Et 3 N) 3 after the crystallization of the molecular conjugate producing white-gel precipitate in solution can be estimated with the Scherrer's formula, (2) using the most intense diffraction lines displayed in Fig. 7.…”

“…Various means of microscopy including such as simultaneous AFM (atomic force microscopy) and SNOM (scanning near-field optical microscopy) play important role in comprehensive characterization of nanomaterials providing their visualization [1][2][3][4]. The simultaneous optical scanning together with the topography probing provides useful appropriate image exhibiting further morphology details of a supramolecular structure.…”