We report the possibility of room temperature d⁰Dilute Magnetic Semiconductor (d⁰DMS) behavior in organic capped Zinc Oxide (ZnO) nanoparticles. The uncapped and organic capped ZnO nanoparticles were prepared through a simple chemical synthesis technique. Tri-n-Octyl Phosphine Oxide (TOPO) and Dodecyle amine (DDA) were used as the capping agents. X-ray diffraction studies reveal that the organically capped nanoparticles were compressively strained. X-ray Photoelectron spectroscopy demonstrated that strain in the nanoparticles arise as the capping promotes vacancy sites for oxygen in ZnO nanocrystals. The magnetic measurements showed a room temperature ferromagnetic ordering in the as prepared ZnO nanoparticles samples. The observed ferromagnetism can be mainly attributed to positional defects in ZnO nanocrystals. In addition, the surface electronic configuration, which is modified by the capping molecules wrapped on the surface of ZnO nanoparticles, also has a key role in the origin of ferromagnetism.

我们报告了室温 d ⁰稀释磁性半导体 (d ⁰ DMS) 在有机封端氧化锌 (ZnO) 纳米粒子中的可能性。未封端和有机封端的 ZnO 纳米粒子是通过简单的化学合成技术制备的。三ñ-辛基氧化膦(TOPO)和十二烷基胺(DDA)用作封端剂。X 射线衍射研究表明，有机封端的纳米粒子受到压缩应变。X 射线光电子能谱表明，随着封端促进 ZnO 纳米晶体中氧的空位，纳米粒子中的应变出现。磁性测量显示在制备的 ZnO 纳米颗粒样品中存在室温铁磁有序。观察到的铁磁性主要归因于 ZnO 纳米晶体中的位置缺陷。此外，由包裹在 ZnO 纳米粒子表面的封端分子修饰的表面电子构型在铁磁性的起源中也起着关键作用。