Electric-Field-Assisted Directed Assembly of Transition Metal Dichalcogenide Monolayer Sheets

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• 作者：Donna D. Deng ; Zhong Lin ; Ana Laura Elías ; Nestor Perea-Lopez ; Jie Li ; Chanjing Zhou ; Kehao Zhang ; Simin Feng ; Humberto Terrones ; Jeffrey S. Mayer ; Joshua A. Robinson ; Mauricio Terrones ; Theresa S. Mayer
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：10
• 期：5
• 页码：5006-5014
• 全文大小：481K
• 年卷期：0
• ISSN：1936-086X

文摘

Directed assembly of two-dimensional (2D) layered materials, such as transition metal dichalcogenides, holds great promise for large-scale electronic and optoelectronic applications. Here, we demonstrate controlled placement of solution-suspended monolayer tungsten disulfide (WS₂) sheets on a substrate using electric-field-assisted assembly. Micrometer-sized triangular WS₂ monolayers are selectively positioned on a lithographically defined interdigitated guiding electrode structure using the dielectrophoretic force induced on the sheets in a nonuniform field. Triangular sheets with sizes comparable to the interelectrode gap assemble with an observed preferential orientation where one side of the triangle spans across the electrode gap. This orientation of the sheets relative to the guiding electrode is confirmed to be the lowest energy configuration using semianalytical calculations. Nearly all sheets assemble without observable physical deformation, and postassembly photoluminescence and Raman spectroscopy characterization of the monolayers reveal that they retain their as-grown crystalline quality. These results show that the field-assisted assembly process may be used for large-area bottom-up integration of 2D monolayer materials for nanodevice applications.