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A series of Mn-doped TiO_2 nanowires (NWs) were prepared by hydrothermal method at the mole fraction of Mn changing from 0 to 12.0%. X-ray powder diffraction (XRD) analysis shows that all the samples have pure anatase structure. SEM and TEM studies show that the diameter and the length of the Mn-doped TiO_2 NWs are larger than those of the undoped TiO_2 NWs. Energy dispersive X-ray spectroscopy (EDX) reveals that the samples are composed of Ti, Mn and O. According to magnetization measurements, all samples show ferromagnetic behavior, but only the undopedTiO_2 NWs are completely ferromagnetic with a saturated magnetization about 1.0 mA·m~2/kg. Mn-doped TiO_2 samples exhibit antiferromagnetic and ferromagnetic (AF-FM) behaviors simultaneously. Photoluminescence (PL) spectra demonstrate the existence of MnO_2 sublattice. These observations indicate that an AF-WF crossover is induced by the coexistence of TiO_2 sublattice and MnO_2 sublattice. 相似文献
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用于大面积周期性图形制造的激光干涉光刻 总被引:13,自引:5,他引:8
用两束或多束相干激光束以不同的组合形式对光致抗蚀剂曝光,可在大面积范围内产生精细的二维周期性图形,这个方法特别适合于产生光电子器件和生电子器件的周期性结构。介绍激光干涉光刻的基本原理,对几种光束组合干涉方法给出了理论推导结果,并进行了计算机模拟。初步的实验结果表明,用激光干扰光刻技术产生大面积的亚微米级周期性孔、柱、锥图形是可行的。该方法不需要掩模、昂贵的光刻成像透镜、新的短波长光源和新型的抗蚀剂,提供了得到高分辨、无限焦深、大面积光刻的可能性。 相似文献
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