首页> 外文期刊>Nanotechnology >CoFe_2O_4-polypyrrole (PPy) nanocomposites: new multifunctional materials
【24h】

CoFe_2O_4-polypyrrole (PPy) nanocomposites: new multifunctional materials

机译:CoFe_2O_4-聚吡咯(PPy)纳米复合材料:新型多功能材料

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

Spinel ferrites (iron cobalt oxide) were prepared by the microemulsion method at different temperatures and sodium dodecyl sulphate (SDS) surfactant concentrations. Subsequently, a quantity of the different samples were coated with an intrinsically conducting polymer (ICP) shell of polypyrrole. The polymer shell was synthesized by a chemical route after the ferrites particle production. By combining in a single material the electrical conductivity of ICPs and the magnetic properties of nanopowder ferrites, new multifunctional materials have been developed. Different CoFe_2O_4 grain size particles were obtained ranging from 3 to 30 nm, as determined by x-ray diffraction (XRD). Particles with grain size below a critical size exhibit a superparamagnetic behaviour. These superparamagnetic particles, without and with a conducting polymer shell, were analysed by transmission electron microscopy (TEM) to find the grains' morphology and the growth evolution of the polypyrrole shell in the ferrites grains. The electrical conductivity of the nanocomposite was measured by the four points probe method, showing values of 120 +- 4 S cm~(-1) at ambient temperature. The behaviour of the magnetization and the coercivity with temperature, from nearly 0 K to the ambient, were measured in a vibrating sample magnetometer (VSM).
机译:通过微乳液法在不同温度和十二烷基硫酸钠(SDS)表面​​活性剂浓度下制备尖晶石铁氧体(氧化钴铁)。随后,将一定数量的不同样品涂上聚吡咯的本征导电聚合物(ICP)外壳。在生产铁氧体颗粒之后,通过化学途径合成聚合物壳。通过将ICP的电导率和纳米粉末铁氧体的磁性能结合在一种材料中,已开发出新的多功能材料。通过X射线衍射(XRD)测定,获得了3至30nm范围内的不同CoFe_2O_4晶粒尺寸颗粒。粒度小于临界尺寸的颗粒表现出超顺磁性行为。通过透射电子显微镜(TEM)分析了这些不带导电聚合物壳和带导电聚合物壳的超顺磁性颗粒,以发现铁氧体晶粒的形貌和聚吡咯壳的生长演化。纳米复合材料的电导率通​​过四点探针法测量,在环境温度下显示值为120±4S cm〜(-1)。在振动样品磁力计(VSM)中测量了从接近0 K到周围温度的磁化强度和矫顽力随温度的变化。

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