Zn2GeO4/SnO2纳米线结构：相关空间分辨X射线研究
Zn2GeO4/SnO2 nanowire architecture: A correlative spatially resolved X-ray study
摘要：
基于纳米线的宽带隙半导体异质结构作为开发新型光电子器件的纳米级构件之一，引起了人们极大的兴趣。由于异质性和结构缺陷在光电性能中的关键作用，详细研究这些系统的局部结构和元素组成已成为一个挑战。通常，透射电子显微镜和能量色散X射线光谱法用于解决这些问题。在这里，使用同步辐射纳米束探针，我们显示了相关的空间分辨研究的组成，发光和局部结构的Zn 2GeO 4/SnO 2纳米线为基础的系统。与其他工作不同的是，异质结构是通过一种有效的无催化剂的热蒸发方法合成的，并呈现出一个由Plateau-Rayleigh不稳定性形成的斜叉形结构。我们的研究结果突出了扩散杂质的异质结构的光学性质的作用，并开辟了新的途径，进一步异质性研究使用X射线纳米探针。
英文摘要：
Wide bandgap semiconductor heterostructures based on nanowires have attracted great interest as one of the nanoscale building blocks for the development of novel optoelectronic devices. Owing to the critical role of heterogeneities and structural imperfections in the optoelectronic properties, it has become a challenge to investigate in detail the local structure and elemental composition of these systems. Typically, transmission electron microscopy and energy dispersive X-ray spectroscopy are applied to address such issues. Here, using a synchrotron nanobeam probe, we show a correlative spatially-resolved study of the composition, luminescence and local structure of a Zn2GeO4/SnO2 nanowire-based system. Unlike other works, the heterostructures were synthesized by an effective catalyst-free thermal evaporation method and present a skewer-shaped architecture formed by Plateau-Rayleigh instability. Our results highlight the role of diffused impurities on the optical properties of the heterostructure and open new avenues for further heterogeneity studies using the X-ray nanoprobe.
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