Abstract: One dimensional ZnO nanostructures doped with Mn were synthesized using a radio frequency (RF) thermal plasma with the mixture of Zn and MnCl2 powders as staring materials. The influences of Mn doping on the morphology and properties of synthesized products were investigated. It is found that the peak positions of (100), (002) and (101) shift a little to the smaller 2q, which confirms that Mn is doped into ZnO crystal lattice. SEM, TEM and HRTEM were used to characterize the synthesized Mn doped one dimensional ZnO. The length of synthesized doped ZnO decreases from about 2 mm to 200 nm, and the diameter increases from about 30 nm to 100 nm when the mole ratio of Mn to Zn increases to 4%, respectively. The synthesized one dimensional Mn doped ZnO nanostructures exhibit ferromagnetism under normal temperature, and the magnetization increases with the increase of doped Mn concentration.

Key words: ZnO, one-dimension nanostructure, doping, thermal plasma

摘要： 以锌粉和MnCl2为反应物，在高频感应热等离子体中制备了Mn掺杂的ZnO纳米棒. 通过XRD, FESEM, TEM和HRTEM对产物的结构、形貌进行了分析. 随着Mn掺杂量的增加，ZnO的衍射峰向小角方向移动，证实掺杂的Mn原子进入了ZnO晶体的晶格，ZnO纳米棒的长径比逐渐减小，未掺杂的ZnO纳米棒直径约为30 nm，长度约为2 mm，当掺杂的Mn/Zn摩尔比为4%时，掺杂后的ZnO纳米棒直径约为100 nm，长度约为200 nm. Mn掺杂的ZnO纳米棒显示出了室温铁磁性特征，且随Mn掺杂含量提高而增强，当Mn掺杂量由0.25%增加到4%时，ZnO纳米棒的矫顽力从78 Oe上升到149 Oe.

关键词: ZnO, 纳米棒, 掺杂, 热等离子体