1. Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dots.
- Author
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Wang, Yan, Liu, Yang, Zhang, Jianfang, Wu, Jingjie, Xu, Hui, Wen, Xiewen, Zhang, Xiang, Tiwary, Chandra Sekhar, Yang, Wei, Vajtai, Robert, Zhang, Yong, Chopra, Nitin, Odeh, Ihab Nizar, Wu, Yucheng, and Ajayan, Pulickel M.
- Subjects
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QUANTUM dots , *QUANTUM electronics , *SOLVENTS , *LIQUID nitrogen , *CRYOGENICS - Abstract
Atomically thin quantum dots from layered materials promise new science and applications, but their scalable synthesis and separation have been challenging. We demonstrate a universal approach for the preparation of quantum dots from a series of materials, such as graphite, MoS2, WS2, h-BN, TiS2, NbS2, Bi2Se3, MoTe2, Sb2Te3, etc., using a cryo-mediated liquid-phase exfoliation and fracturing process. The method relies on liquid nitrogen pretreatment of bulk layered materials before exfoliation and breakdown into atomically thin two-dimensional quantum dots of few-nanometer lateral dimensions, exhibiting size-confined optical properties. This process is efficient for a variety of common solvents with a wide range of surface tension parameters and eliminates the use of surfactants, resulting in pristine quantum dots without surfactant covering or chemical modification. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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