Beilstein J. Nanotechnol.2015,6, 2319–2329, doi:10.3762/bjnano.6.238
the surfactants adsorbed on the NCs.
Keywords: manganese oxide; manganese sulfide; nanocrystal; polymorphismcontrol; solvothermal synthesis; sulfur; surfactant; Introduction
Manganese(II) sulfide (MnS) is a wide bandgap (Eg ≈ 3 eV) [1], p-type, antiferromagnetic semiconductor that crystallizes in
oleylamine (100:1 with respect to Mn) [27].
Polymorphismcontrol could also be achieved by chemical means. By reacting manganese(II) chloride and thiourea in an autoclave (T = 190 °C) for 12 h, 30 nm α-MnS NCs were prepared using water as a solvent, whereas when the solvent was benzene, γ-MnS rods (d = 40
-MnS NCs only when OlAm was used. The γ-directing effect of amines observed with MnSt2 vanished when Mn2(CO)10 was used, pointing at an important role of the stearate ligand in the polymorphismcontrol. The NCs were smaller and had a lower aspect ratio than the corresponding ones prepared starting from
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Figure 1:
TEM images (left) and electron diffraction patterns (right) of NCs obtained by high temperature dec...