论文标题
可调$ sns-tas_2 $纳米级超级晶格的合成
Synthesis of tunable $SnS-TaS_2$ nanoscale superlattices
论文作者
论文摘要
纳米级超级晶格代表了设计材料的引人注目的平台，因为组成层的特定身份和空间排列可以导致可调属性。许多动力学稳定的分层硫化葡萄糖剂纳米复合材料已经从Misfit化合物中获得了灵感，这是一种由范德华（Van der Waals）键入（VDW）层形成的热力学稳定材料类。这类VDW异质结构超级晶格已在牙脲和硒化学化学中报道，但尚未扩展到硫化物。在这里，我们提出$ sns-tas_2 $纳米级超级晶格，并带有可调层体系结构。薄膜由分层的无定形前体制备，并沉积以模仿目标超晶格。随后的低温退火将自组装激活到设计的纳米复合材料中。研究了材料的结构和成分，这些结构和组合物使用X射线衍射，X射线衍射，X射线荧光和传输电子显微镜，$ [（sns）_ {（SNS）_ {1+δ}] _ 3（tas_2）_1 $和$（sns）_1 _1 _1（tas_2）_1 $。实施了分级沉积方法，以稳定具有单个制备的多个堆叠序列的异质结构。对这种纳米级超晶格的结构的精确控制是控制量子材料和组成设备的性质的关键途径。
Nanoscale superlattices represent a compelling platform for designed materials as the specific identity and spatial arrangement of constituent layers can lead to tunable properties. A number of kinetically-stabilized layered chalcogenide nanocomposites have taken inspiration from misfit compounds, a thermodynamically stable class of materials formed of van der Waals-bonded (vdW) layers. This class of vdW heterostructure superlattices have been reported in telluride and selenide chemistries, but have not yet been extended to sulfides. Here we present $SnS-TaS_2$ nanoscale superlattices with tunable layer architecture. Thin films are prepared from layered amorphous precursors and deposited to mimic the targeted superlattice; subsequent low temperature annealing activates self-assembly into designed nanocomposites. Structure and composition for materials are investigated that span stacking sequences between $[(SnS)_{1+δ}]_3(TaS_2)_1$ and $(SnS)_7(TaS_2)_1$ using x-ray diffraction, x-ray fluorescence, and transmission electron microscopy. A graded deposition approach is implemented to stabilize heterostructures of multiple stacking sequences with a single preparation. Precise control over the architecture of such nanoscale superlattices is a critical path towards controlling the properties of quantum materials and constituent devices.
