New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, India.
Angew Chem Int Ed Engl. 2017 Nov 13;56(46):14561-14566. doi: 10.1002/anie.201708293. Epub 2017 Oct 6.
Creation of new van der Waals heterostructures by stacking different two dimensional (2D) crystals on top of each other in a chosen sequence is the next challenge after the discovery of graphene, mono/few layer of h-BN, and transition-metal dichalcogenides. However, chemical syntheses of van der Waals heterostructures are rarer than the physical preparation techniques. Herein, we demonstrate the kinetic stabilization of 2D ultrathin heterostructure (ca. 1.13-2.35 nm thick) nanosheets of layered intergrowth SnBi Te , SnBi Te , and SnBi Te , which belong to the Sn Bi Te homologous series, by a simple solution based synthesis. Few-layer nanosheets exhibit ultralow lattice thermal conductivity (κ ) of 0.3-0.5 W m K and semiconducting electron-transport properties with high carrier mobility.
在发现石墨烯、单层/少层 h-BN 和过渡金属二卤化物之后，通过在选定的序列中将不同的二维 (2D) 晶体堆叠在一起，来创建新的范德华异质结构，这是下一个挑战。然而，范德华异质结构的化学合成比物理制备技术更为少见。在此，我们通过简单的基于溶液的合成方法，证明了层状共生 SnBiTe、SnBiTe 和 SnBiTe 的二维超薄异质结构（约 1.13-2.35nm 厚）纳米片的动力学稳定性，它们属于 SnBiTe 同系物。少层纳米片表现出超低晶格热导率 (κ) 为 0.3-0.5 W m K 和具有高载流子迁移率的半导体电子输运性能。
