Sahoo Y, Poddar P, Srikanth H, Lucey D W, Prasad P N
Institute for Lasers, Photonics and Biophotonics, The State University of New York at Buffalo, Buffalo, New York 14260, USA.
J Phys Chem B. 2005 Aug 18;109(32):15221-5. doi: 10.1021/jp050202n.
Quantum dots of InP:Mn are chemically prepared by following hot colloidal nanochemistry with starting precursors that obviate the need for external surfactant. These quantum dots are uniform spheres with 3-nm diameters; they are crystalline, photoluminescent, and magnetic. The crystallographic and optical properties are similar to those of undoped InP nanocrystallites, while the magnetism is consistent with the ferromagnetic response observed in a class of diluted magnetic semiconductors. Because of the ultrafine sizes, the sample shows superparamagnetic behavior, whereas ferromagnetic hysteresis loops are clearly seen below the blocking temperature. Structural characterization and analysis confirm that the magnetism in these quantum dots is not due to segregated binary MnP or MnO phases and that they truly represent a homogeneous dilute magnetic semiconductor.
通过遵循热胶体纳米化学方法，使用起始前驱体来化学制备InP:Mn量子点，该方法无需外部表面活性剂。这些量子点是直径为3纳米的均匀球体；它们是晶体，具有光致发光和磁性。其晶体学和光学性质与未掺杂的InP纳米微晶相似，而磁性与在一类稀磁半导体中观察到的铁磁响应一致。由于尺寸极细，该样品表现出超顺磁行为，而在低于阻塞温度时可清晰看到铁磁滞回线。结构表征和分析证实，这些量子点中的磁性并非由于分离的二元MnP或MnO相，它们真正代表了一种均匀的稀磁半导体。
