Nanoscience for Energy Technology and Sustainability, Department of Mechanical and Process Engineering, Eidgenössische Technische Hochschule (ETH) Zürich , Tannenstrasse 3, CH-8092 Zürich, Switzerland.
Advanced Materials Simulations Group, Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology , 34051 Daejeon, Korea.
Nano Lett. 2017 Apr 12;17(4):2342-2348. doi: 10.1021/acs.nanolett.6b05238. Epub 2017 Mar 17.
Two-dimensional (2D) subnanometer channels allow unique mass transport promising for molecular sieving. New 2D channels of MoS nanosheets allow one to understand molecular transmission and separation, unlike the graphene oxide counterpart containing various defects and cationic metal contaminants. Membranes from layered MoS platelets show extraordinary stability in an aqueous environment and compatibility with polymer filters, both beneficial to efficient manufacturing. Sharing gas-tightness and unimpeded water vapor permeation with a graphene oxide membrane, our lamellar MoS membrane demonstrates a molecular sieving property for organic vapor for the first time. The MoS membrane also reveals diffusion selectivity of aqueous ions, attributable to the energy penalty in bulk-to-2D dimensional transition. These newly revealed properties of the lamellar membrane full of angstrom-sized 2D channels point to membrane technology applications for energy and environment.
二维（2D）亚纳米通道允许独特的质量传输，有望实现分子筛分。不同于含有各种缺陷和阳离子金属污染物的氧化石墨烯对应物，MoS 纳米片的新型 2D 通道可以让人们了解分子的传输和分离。来自层状 MoS 薄片的膜在水环境中表现出非凡的稳定性，并且与聚合物过滤器兼容，这两者都有利于高效制造。与氧化石墨烯膜共享气体密封性和水蒸气无阻渗透，我们的层状 MoS 膜首次展示了对有机蒸气的分子筛性能。MoS 膜还表现出对水溶液离子的扩散选择性，这归因于从体相到 2D 尺寸转变的能量代价。这种充满埃米级 2D 通道的层状膜的新发现性质为能源和环境的膜技术应用指明了方向。
