首页> 外文期刊>Nanotechnology >The role of reduced graphene oxide capping on defect induced ferromagnetism of ZnO nanorods
【24h】

The role of reduced graphene oxide capping on defect induced ferromagnetism of ZnO nanorods

机译:氧化石墨烯封端还原对缺陷诱导的ZnO纳米棒铁磁性的作用

获取原文
获取原文并翻译 | 示例
           

摘要

In this study, the effect of different numbers of layers of reduced graphene oxide (RGO) on the ferromagnetic behavior of zinc oxide-reduced graphene oxide (ZnO-RGO) hybrid architectures has been investigated. Scanning and transmission electron microscopy along with x-ray diffraction of these hybrids confirm that ZnO nanorods are wrapped with different numbers of layers of RGO in a controlled way and their hexagonal phase is unaffected by these layers. Raman and photoelectron spectroscopy of these hybrids reveals that RGO does not alter the nonpolar optical phonon E_2 (high) mode and chemical state of Zn~(2+) in ZnO. Electron paramagnetic resonance (EPR) spectra show that RGO passivates singly charged oxygen vacancies (V _(OS) ~+) in ZnO. It correlates the passivation efficiency of to the number of RGO layers and this has been achieved up to 90% by ~31 layers of RGO. Due to passivation of in ZnO by RGO, the ferromagnetic behavior (saturation magnetization and divergence between zero field cooled and field cooled) in ZnO-RGO hybrids is suppressed as compared to ZnO. Combining the EPR and magnetic behavior, a direct link between the passivation of the singly charged oxygen vacancies present on the surface of ZnO nanorods and the number of RGO layers is established.
机译:在这项研究中,已研究了不同数量的还原氧化石墨烯(RGO)层对氧化锌还原氧化石墨烯(ZnO-RGO)混合体系结构的铁磁性能的影响。这些杂化物的扫描和透射电子显微镜以及X射线衍射证实,ZnO纳米棒以可控的方式包裹着不同数量的RGO层,并且它们的六方相不受这些层的影响。这些杂化物的拉曼光谱和光电子能谱表明,RGO不会改变ZnO中Zn〜(2+)的非极性光子E_2(高)模式和化学态。电子顺磁共振(EPR)光谱表明,RGO钝化了ZnO中的单电荷氧空位(V _(OS)〜+)。它的钝化效率与RGO的层数相关,而RGO的约31层达到了90%。由于通过RGO对ZnO进行钝化,与ZnO相比,ZnO-RGO杂化物中的铁磁行为(饱和磁化强度和零磁场冷却和磁场冷却之间的发散)得到了抑制。结合EPR和磁行为,建立了ZnO纳米棒表面上存在的单电荷氧空位的钝化与RGO层数之间的直接联系。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号