溶剂热合成的 Sb2Te3 板在中红外近场扫描显微镜下显示出意想不到的光学对比度。

Solvothermally Synthesized Sb2Te3 Platelets Show Unexpected Optical Contrasts in Mid-Infrared Near-Field Scanning Microscopy.

机构信息

†Institute of Physics (IA) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.

‡Institute of Inorganic Chemistry (IAC) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.

出版信息

Nano Lett. 2015 May 13;15(5):2787-93. doi: 10.1021/nl503697c. Epub 2015 Apr 27.

DOI:10.1021/nl503697c

PMID:25868047

Abstract

We report nanoscale-resolved optical investigations on the local material properties of Sb2Te3 hexagonal platelets grown by solvothermal synthesis. Using mid-infrared near-field microscopy, we find a highly symmetric pattern, which is correlated to a growth spiral and which extends over the entire platelet. As the origin of the optical contrast, we identify domains with different densities of charge carriers. On Sb2Te3 samples grown by other means, we did not find a comparable domain structure.

摘要

我们报告了通过溶剂热合成生长的 Sb2Te3 六方板的纳米分辨率光学研究，揭示了其局部材料性质。利用中红外近场显微镜，我们发现了一种高度对称的图案，它与生长螺旋相关，并延伸到整个板。作为光学对比度的起源，我们确定了具有不同载流子密度的畴。在通过其他方法生长的 Sb2Te3 样品中，我们没有发现可比的畴结构。