Metastable (β and γ) and stable (α) MnS crystallites were synthesized by solvothermal reaction in various solvents at 190−200 °C. In tetrahydrofuran and benzene, the metastable MnS crystallites can be obtained. In water, ammonia liquor, ethylenediamine, α-MnS, which is converted from the metastable phase, would be obtained. The low solubility of MnS is the crucial reason to stabilize the metastable phase with good yield. The metastable MnS crystallites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The metastable γ-MnS crystallites with rodlike morphology were found, and a unique “methane-like” four-branched rod cluster was characterized. The blue shift of the absorption edge indicates the quantum size effect of metastable MnS nanocrystallites.

Metastable MnS Crystallites through Solvothermal Synthesis

Solution-dispersible nanoparticles of γ-MnSe are prepared from MnCl2, Se powder, and a 1:1 mixture of oleic acid and tetraethylene glycol (Ar, 235 °C, 4 h)

Colloidal synthesis of non-equilibrium wurtzite-type MnSe

Hydrothermal preparation of α-MnS nanorods from elements

Optical and structural properties of manganese sulfide thin films

Well-crystallized γ -MnS films in a pure phase have been deposited on commercial glass substrates by chemical bath deposition. The structure and morphology of the obtained γ -MnS film were characterized, and the results showed that the film was composed of asymmetric hexagonal crystals with a size of 500–1000 nm. The photoluminescence of the γ -MnS film has been studied from 295 K down to 30 K and exhibited two emission bands centered at 1.8 and 1.66 eV, respectively. The temperature dependence of photoluminescence was also observed and interpreted using the spin-wave-assist photoluminescence model.

Photoluminescence of MnS thin film prepared by chemical bath deposition

Heteroepitaxial growth of MnS on GaAs substrates

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Heteroepitaxial growth of MnS on GaAs substrates