Selective Ionic Transport Pathways in Phosphorene

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• 作者：Anmin Nie ; Yingchun Cheng ; Shoucong Ning ; Tara Foroozan ; Poya Yasaei ; Wen Li ; Boao Song ; Yifei Yuan ; Lin Chen ; Amin Salehi-Khojin ; Farzad Mashayek ; Reza Shahbazian-Yassar
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2240-2247
• 全文大小：791K
• 年卷期：0
• ISSN：1530-6992

文摘

Despite many theoretical predictions indicating exceptionally low energy barriers of ionic transport in phosphorene, the ionic transport pathways in this two-dimensional (2D) material has not been experimentally demonstrated. Here, using in situ aberration-corrected transmission electron microscopy (TEM) and density functional theory, we studied sodium ion transport in phosphorene. Our high-resolution TEM imaging complemented by electron energy loss spectroscopy demonstrates a precise description of anisotropic sodium ions migration along the [100] direction in phosphorene. This work also provides new insight into the effect of surface and the edge sites on the transport properties of phosphorene. According to our observation, the sodium ion transport is preferred in zigzag edge rather than the armchair edge. The use of this highly selective ionic transport property may endow phosphorene with new functionalities for novel chemical device applications.