Tunable, Strain-Controlled Nanoporous MoS2 Filter for Water Desalination

详细信息    查看全文

• 作者：Weifeng Li ; Yanmei Yang ; Jeffrey K. Weber ; Gang Zhang ; Ruhong Zhou
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：1829-1835
• 全文大小：401K
• ISSN：1936-086X

文摘

The deteriorating state of global fresh water resources represents one of the most serious challenges that scientists and policymakers currently face. Desalination technologies, which are designed to extract potable water from the planet’s bountiful stores of seawater, could serve to alleviate much of the stress that presently plagues fresh water supplies. In recent decades, desalination methods have improved via water-filtering architectures based on nanoporous graphene filters and artificial membranes integrated with biological water channels. Here, we report the auspicious performance (in simulations) of an alternative nanoporous desalination filter constructed from a MoS₂ nanosheet. In striking contrast to graphene-based filters, we find that the “open” and “closed” states of the MoS₂ filter can be regulated by the introduction of mechanical strain, yielding a highly tunable nanopore interface. By applying lateral strain to the MoS₂ filter in our simulations, we see that the transition point between “open” and “closed” states occurs under tension that induces about 6% cross-sectional expansion in the membrane (6% strain); the open state of the MoS₂ filter demonstrates high water transparency and a strong salt filtering capability even under 12% strain. Our results thus demonstrate the promise of a controllable nanoporous MoS₂ desalination filter, wherein the morphology and size of the central nanopore can be precisely regulated by tensile strain. These findings support the design and proliferation of tunable nanodevices for filtration and other applications.