首页> 外文期刊>Advanced Functional Materials >Local Structure and Chemistry of C-Doped ZnO@C Core-Shell Nanostructures with Room-Temperature Ferromagnetism
【24h】

Local Structure and Chemistry of C-Doped ZnO@C Core-Shell Nanostructures with Room-Temperature Ferromagnetism

机译:具有室温铁磁性的C掺杂ZnO @ C核壳纳米结构的局部结构和化学

获取原文
获取原文并翻译 | 示例
           

摘要

A superior approach is presented to study quantitatively fine structure of C-doped ZnO nanostructure using transmission electron microscopy (TEM) from which the role of carbon in ZnO crystal to form ferromagnetism is revealed at the first time. Electron diffraction in TEM shows Wurtzite structure in the nanoparticles with lattice parameters (a = 0.327 +/- 0.03 nm and c = 0.529 +/- 0.04 nm) slightly different from the original structure. Interestingly, the Zn-C bonding with a bonding length of 2.58 angstrom is experimentally determined using atomic pair distribution function (PDF) calculated from electron diffraction data. Together with other bondings, such as C-C, Zn-O obtained from the PDF, this demonstrates migration of C atoms into ZnO crystal to substitute O vacancies. This is furthermore visualized by high-resolution TEM imaging and elemental mapping, and strongly supports the proposal of origin of ferromagnetism in the C-doped ZnO nanoparticles where the s-p and p-p hybridizations formed by C2p-Zn4s, and O2p-C2p orbitals are believed to cause ferromagnetism.
机译:提出了一种使用透射电子显微镜(TEM)定量研究C掺杂的ZnO纳米结构的精细结构的方法,该方法首次揭示了ZnO晶体中碳形成铁磁性的作用。 TEM中的电子衍射显示,晶格参数(a = 0.327 +/- 0.03 nm和c = 0.529 +/- 0.04 nm)的纳米粒子中的纤锌矿结构与原始结构略有不同。有趣的是,使用从电子衍射数据计算出的原子对分布函数(PDF),实验确定了键长为2.58埃的Zn-C键。与其他键合(例如从PDF中获得的C-C,Zn-O)一起,证明了C原子迁移到ZnO晶体中以取代O空位。此外,还可以通过高分辨率TEM成像和元素映射将其可视化,并强烈支持在C掺杂的ZnO纳米粒子中铁磁性的起源建议,其中C2p-Zn4s和O2p-C2p轨道形成的sp和pp杂化被认为是引起铁磁性。

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