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Reversible and selective ion intercalation through the top surface of few-layer MoS2.
Nature Communications ( IF 16.6 ) Pub Date : 2018-12-11 , DOI: 10.1038/s41467-018-07710-z
Jinsong Zhang , Ankun Yang , Xi Wu , Jorik van de Groep , Peizhe Tang , Shaorui Li , Bofei Liu , Feifei Shi , Jiayu Wan , Qitong Li , Yongming Sun , Zhiyi Lu , Xueli Zheng , Guangmin Zhou , Chun-Lan Wu , Shou-Cheng Zhang , Mark L. Brongersma , Jia Li , Yi Cui

Electrochemical intercalation of ions into the van der Waals gap of two-dimensional (2D) layered materials is a promising low-temperature synthesis strategy to tune their physical and chemical properties. It is widely believed that ions prefer intercalation into the van der Waals gap through the edges of the 2D flake, which generally causes wrinkling and distortion. Here we demonstrate that the ions can also intercalate through the top surface of few-layer MoS2 and this type of intercalation is more reversible and stable compared to the intercalation through the edges. Density functional theory calculations show that this intercalation is enabled by the existence of natural defects in exfoliated MoS2 flakes. Furthermore, we reveal that sealed-edge MoS2 allows intercalation of small alkali metal ions (e.g., Li+ and Na+) and rejects large ions (e.g., K+). These findings imply potential applications in developing functional 2D-material-based devices with high tunability and ion selectivity.

中文翻译:

通过几层MoS2顶表面的可逆和选择性离子嵌入。

将离子电化学插入二维(2D)层状材料的范德华间隙中是一种有前途的低温合成策略,可调节其物理和化学性质。人们普遍认为,离子更喜欢通过2D薄片的边缘插入范德华间隙中,这通常会导致起皱和变形。在这里,我们证明了离子也可以穿过几层MoS 2的上表面进行插入,与通过边缘进行的插入相比,这种类型的插入更具可逆性和稳定性。密度泛函理论计算表明,这种剥落是由剥落的MoS 2薄片中自然缺陷的存在引起的。此外,我们揭示了密封边缘的MoS 2允许插入较小的碱金属离子(例如Li +和Na +)并排斥较大的离子(例如K +)。这些发现暗示了在开发具有高可调性和离子选择性的基于功能性2D材料的设备中的潜在应用。
更新日期:2018-12-11
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