One-dimensional van der Waals heterostructures

We present the experimental synthesis of one-dimensional (1D) van der Waals heterostructures, a class of materials where different atomic layers are coaxially stacked. We demonstrate the growth of single-crystal layers of hexagonal boron nitride (BN) and molybdenum disulfide (MoS2) crystals on single-walled carbon nanotubes (SWCNTs). For the latter, larger-diameter nanotubes that overcome strain effect were more readily synthesized. We also report a 5-nanometer-diameter heterostructure consisting of an inner SWCNT, a middle three-layer BN nanotube, and an outer MoS2 nanotube. Electron diffraction verifies that all shells in the heterostructures are single crystals. This work suggests that all of the materials in the current 2D library could be rolled into their 1D counterparts and a plethora of function-designable 1D heterostructures could be realized.

我们介绍了一维（1D）范德华异质结构的实验合成，这是一类不同原子层同轴堆叠的材料。我们展示了在单壁碳纳米管（SWCNTs）上生长六方氮化硼（BN）单晶层和二硫化钼（MoS₂）晶体。对于后者，克服应变效应的较大直径纳米管更容易合成。我们还报道了一种直径为5纳米的异质结构，它由内部的单壁碳纳米管、中间的三层氮化硼纳米管和外部的二硫化钼纳米管组成。电子衍射证实异质结构中的所有壳层都是单晶。这项工作表明，当前二维材料库中的所有材料都可以卷成它们的一维对应物，并且可以实现大量功能可设计的一维异质结构。