Synthesis of Undoped and Manganese-Doped HgTe Nanoparticles Using [Hg(TeCH2CH2NMe2)2] as a Single Source Precursor

The Reaction of [HgCl2(tmeda)] with NaTeCH2CH2NMe2 gave a mercury tellurolate, [Hg(TeCH2CH2 center dot NMe2)(2)] (1) as a yellow crystalline solid, which was characterized by elemental analysis, UV-vis, mass and NMR (H-1, C-13, Te-125, Hg-199) spectroscopy. Thermolysis of 1 in hexadecylamine (HDA) at 90 degrees C in the absence and presence of Mn(OAc)(2). 4H(2)O gave undoped and Mn-doped HgTe nanoparticles which were characterized by XRD, EDAX, TEM, EPR and magnetic measurements. These particles could be synthesized with mean particle size of 6-7 nm (from TEM). Manganese substitution at Hg site in HgTe lead to a linear decrease in lattice parameter with increasing concentration of Mn. Magnetization measurements showed ferromagnetic ordering at room temperature with very small coercive field (H-c 50 Oe) for Hg0.973Mn0.027 Te sample. This sample also exhibited distinct ferromagnetic resonance (FMR) in the EPR spectrum.