首页> 外文期刊>Nanotechnology >Oxygen content modulation by nanoscale chemical and electrical patterning in epitaxial SrCoO3-delta (0 delta = 0.5) thin films
【24h】

Oxygen content modulation by nanoscale chemical and electrical patterning in epitaxial SrCoO3-delta (0 delta = 0.5) thin films

机译:通过外延SrCoO3-δ(0 <δ<= 0.5)薄膜中的纳米级化学和电图案化来调节氧含量

获取原文
获取原文并翻译 | 示例
           

摘要

Fast controllable redox reactions in solid materials at room temperature are a promising strategy for enhancing the overall performance and lifetime of many energy technology materials and devices. Easy control of oxygen content is a key concept for the realisation of fast catalysis and bulk diffusion at room temperature. Here, high quality epitaxial brownmillerite SrCoO2.5 thin films have been oxidised to perovskite (P) SrCoO3 with NaClO. X-ray diffraction, scanning probe microscopy and x-ray photoelectron spectroscopy measurements were performed to investigate the structural and electronic changes of the material. The oxidised thin films were found to exhibit distinct morphological changes from an atomically flat terrace structure to forming small nanosized islands with boundaries preferentially in [100] or [010] directions all over the surface, relaxing the in-plane strain imposed by the substrate. The conductivity, or oxygen content, of each single island is confined by these textures, which can be locally patterned even further with electric poling. The high charging level at the island boundaries indicates a magnified electric capacity of SCO thin films, which could be exploited in future device geometries. This finding represents a new way of oxygen modulation with associated self-assembled charge confinement to nanoscale boundaries, offering interesting prospects in nanotechnology applications.
机译:在室温下,固体材料中快速可控的氧化还原反应是提高许多能源技术材料和设备的整体性能和寿命的一种有前途的策略。易于控制的氧含量是在室温下实现快速催化和大量扩散的关键概念。在这里,高质量的外延褐铁矿SrCoO2.5薄膜已被NaClO氧化为钙钛矿(P)SrCoO3。进行了X射线衍射,扫描探针显微镜和X射线光电子能谱测量,以研究材料的结构和电子变化。发现氧化的薄膜表现出明显的形态变化,从原子平坦的台面结构到形成小的纳米尺寸岛,其边界优先在整个表面的[100]或[010]方向上分布,从而缓和了基材施加的面内应变。这些纹理限制了每个单个岛的电导率或氧含量,这些纹理甚至可以通过电极化进一步局部化。岛边界处的高充电水平表明SCO薄膜的电容量增大,可以在未来的器件几何结构中加以利用。这一发现代表了一种氧调节的新方法,其将自组装电荷限制在纳米级边界,为纳米技术应用提供了有趣的前景。

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