5 years ago

Very Large-Sized Transition Metal Dichalcogenides Monolayers from Fast Exfoliation by Manual Shaking

Very Large-Sized Transition Metal Dichalcogenides Monolayers from Fast Exfoliation by Manual Shaking
Xiaojun Wu, Jing Peng, Yue Lin, Xiaoting Li, Yi Xie, Jiajing Wu, Zhi Yu, Yuqiao Guo, Yuan Zhou, Changzheng Wu, Zejun Li, Junchi Wu
For two-dimensional transition metal dichalcogenides (TMD) materials, achieving large size with high quality to provide a basis for the next generation of electronic device geometries has been a long-term need. Here, we demonstrate that, by only manual shaking within several seconds, very large-sized TMD monolayers that cover a wide range of group IVB-VIB transition metal sulfides and selenides can be efficiently harvested from intercalated single-crystal counterparts. Taking TaS2 as examples, monolayers up to unprecedented size (>100 μm) are obtained while maintaining high crystalline quality and the phase structure of the starting materials. Furthermore, benefiting from the gentle manual shaking, we unraveled the atomic-level correlation between the intercalated lattice-strain effects and exfoliated nanosheets, and that strong tensile strain usually led to very large sizes. This work helps to deepen the understanding of exfoliation mechanism and provides a powerful tool for producing large-sized and high-quality TMD nanosheets appealing for further applications.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b04332

DOI: 10.1021/jacs.7b04332

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