Laboratório de Novos Materiais Isolantes e Semicondutores (LNMIS), Instituto de Física, Universidade Federal de Uberlândia, CP 593, CEP 38400-902, Uberlândia, Minas Gerais, Brazil.
Nanotechnology. 2011 Mar 11;22(10):105709. doi: 10.1088/0957-4484/22/10/105709. Epub 2011 Feb 2.
Cd(1-x)Mn(x)S nanocrystals (NCs) were successfully grown in a glass matrix and investigated by photoluminescence (PL), electron paramagnetic resonance (EPR) and magnetic force microscopy (MFM). We verified that the luminescent properties of these NCs can be controlled both by changing the x concentration and by thermal annealing of the samples. The EPR and PL data showed that the characteristic emission of Mn(2+) ions ((4)T(1)-(6)A(1)) is only observed when this magnetic impurity is substitutionally incorporated in the Cd(1-x)Mn(x)S NC core (site S(I)). Besides, it was observed that the emission ((4)T(1)-(6)A(1)) suppression, caused by the Mn(2+) ion presence near the surface (site S(II)) of the Cd(1-x)Mn(x)S NCs, is independent of the host material. The MFM images also confirmed the high quality of the Cd(1 - x)Mn(x)S NC samples, showing a uniform distribution of total magnetic moments in the nanoparticles.
Cd(1-x)Mn(x)S 纳米晶体 (NCs) 成功地在玻璃基质中生长，并通过光致发光 (PL)、电子顺磁共振 (EPR) 和磁力显微镜 (MFM) 进行了研究。我们验证了这些 NCs 的发光性质可以通过改变 x 浓度和样品的热退火来控制。EPR 和 PL 数据表明，只有当这种磁性杂质替代地掺入 Cd(1-x)Mn(x)S NC 核 (S(I)位) 时，才会观察到 Mn(2+)离子的特征发射 ((4)T(1)-(6)A(1))。此外，还观察到，由于 Mn(2+)离子存在于 Cd(1-x)Mn(x)S NC 表面附近 (S(II)位)，导致的发射 ((4)T(1)-(6)A(1)) 抑制与宿主材料无关。MFM 图像也证实了 Cd(1 - x)Mn(x)S NC 样品的高质量，显示出纳米颗粒中总磁矩的均匀分布。
