Scalable Transfer of Suspended Two-Dimensional Single Crystals

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• 作者：Bo Li ; Yongmin He ; Sidong Lei ; Sina Najmaei ; Yongji Gong ; Xin Wang ; Jing Zhang ; Lulu Ma ; Yingchao Yang ; Sanghyun Hong ; Ji Hao ; Gang Shi ; Antony George ; Kunttal Keyshar ; Xiang Zhang ; Pei Dong ; Liehui Ge ; Robert Vajtai ; Jun Lou ; Yung Joon Jung ; Pulickel M. Ajayan
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：5089-5097
• 全文大小：619K
• ISSN：1530-6992

文摘

Large-scale suspended architectures of various two-dimensional (2D) materials (MoS₂, MoSe₂, WS₂, and graphene) are demonstrated on nanoscale patterned substrates with different physical and chemical surface properties, such as flexible polymer substrates (polydimethylsiloxane), rigid Si substrates, and rigid metal substrates (Au/Ag). This transfer method represents a generic, fast, clean, and scalable technique to suspend 2D atomic layers. The underlying principle behind this approach, which employs a capillary-force-free wet-contact printing method, was studied by characterizing the nanoscale solid鈥搇iquid鈥搗apor interface of 2D layers with respect to different substrates. As a proof-of-concept, a photodetector of suspended MoS₂ has been demonstrated with significantly improved photosensitivity. This strategy could be extended to several other 2D material systems and open the pathway toward better optoelectronic and nanoelectromechnical systems.