Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, China.
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China.
Adv Mater. 2017 Aug;29(29). doi: 10.1002/adma.201700441. Epub 2017 Jun 7.
2D materials, particularly those bearing in-plane anisotropic optical and electrical properties such as black phosphorus and ReS , have spurred great research interest very recently as promising building blocks for future electronics. However, current progress is limited to layered compounds that feature atomic arrangement asymmetry within the covalently bonded planes. Herein, a series of highly anisotropic nanosheets (Sb Se , Sb S , Bi S , and Sb (S, Se) ), which are composed of 1D covalently linked ribbons stacked together via van der Waals force, is introduced as a new member to the anisotropic 2D material family. These unique anisotropic nanosheets are successfully fabricated from their polymer-like bulk counterparts through a gentle water freezing-thawing approach. Angle-resolved polarized Raman spectroscopy characterization confirms the strong in-plane asymmetry of Sb Se nanosheets, and photodetection study reveals their high responsivity and anisotropic in-plane transport. This work can enlighten the synthesis and application of new anisotropic 2D nanosheets that can be potentially applied for future electronic and optoelectronic devices.
二维材料，特别是那些具有面内各向异性光学和电学性质的材料，如黑磷和 ReS2，最近作为未来电子学有前途的构建块引起了极大的研究兴趣。然而，目前的进展仅限于具有共价键合平面内原子排列不对称性的层状化合物。在此，我们介绍了一系列具有高度各向异性的纳米片（SbSe、SbS、BiS 和 Sb（S，Se）），它们由通过范德华力堆叠在一起的一维共价键连接的带状物组成，是各向异性二维材料家族的新成员。这些独特的各向异性纳米片可以通过温和的水冷冻-解冻方法从其类似聚合物的块状体中成功制备。角分辨偏振拉曼光谱表征证实了 SbSe 纳米片具有很强的面内不对称性，光探测研究揭示了它们的高响应率和各向异性面内输运。这项工作可以启发新的各向异性二维纳米片的合成和应用，它们可能应用于未来的电子和光电子器件。
