Scalable Transfer of Suspended Two-Dimensional Single Crystals

• DOI: 10.1021/acs.nanolett.5b01210
• Publication Date: 2015-07-15T17:08:26Z
• Authors: 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
• Keywords: Polydimethylsiloxane; Transfer printing

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