可调$SnS-TaS_2$纳米超晶格的合成
Synthesis of tunable $SnS-TaS_2$ nanoscale superlattices
摘要：
纳米级超晶格代表了设计材料的一个引人注目的平台，因为组成层的特定身份和空间排列可以导致可调特性。许多动力学稳定的层状硫属化物纳米复合材料从失配化合物中获得灵感，失配化合物是一类由范德华键合（vdW）层形成的热稳定材料。这类vdW异质结构超晶格已在碲化物和硒化物化学中报道，但尚未扩展到硫化物。在这里，我们展示了具有可调层结构的$SnS-TaS_2$纳米级超晶格。薄膜由层状非晶前体制备并沉积以模拟目标超晶格;随后的低温退火激活自组装成设计的纳米复合材料。使用X射线衍射、X射线荧光和透射电子显微镜研究了跨越$[(SnS)_{1+δ}]_3(TaS_2)_1$和$(SnS)_7(TaS_2)_1$之间的堆叠序列的材料的结构和组成。一种梯度沉积方法实现稳定异质结构的多个堆叠序列与一个单一的准备。对此类纳米级超晶格结构的精确控制是控制量子材料和组成器件性能的关键途径。
英文摘要：
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.
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