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Synthesis and Photoluminescence of Cd-doped α-MnS Nanowires

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journal contribution
posted on 21.09.2006, 00:00 by Dae Sung Kim, Jin Young Lee, Chan Woong Na, Sang Won Yoon, Shin Young Kim, Jeunghee Park, Younghun Jo, Myung-Hwa Jung
Cd-doped α-MnS nanowires (av diam = 70 nm) were synthesized by the chemical vapor deposition of MnCl2/CdS powders. They all consisted of single-crystalline rock-salt MnS structures with the [111] growth direction. The X-ray diffraction pattern analysis indicates that 10% Cd doping would expand the lattice constants by 0.3%. As the content of Cd increases, the band edge emission band (2.9 eV) of photoluminescence becomes broader, and the Mn2+ emission band (1.6 eV), which emerged at temperatures below ∼150 K, decreases in intensity. The decay time of the 1.6 eV band decreases from 40 to 30 μs when the Cd doping is increased from 0 to 10%. In contrast to the bulk (TN = 150 K), the MnS nanowires were found to be paramagnetic with antiferromagnetic interactions. These distinctive magnetic properties of the nanowires have a strong correlation with their photoluminescence, which could be influenced by the nanosize effect and the Cd doping.

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