Wang, YanLiu, YangZhang, JianfangWu, JingjieXu, HuiWen, XiewenZhang, XiangTiwary, Chandra SekharYang, WeiVajtai, RobertZhang, YongChopra, NitinOdeh, Ihab NizarWu, YuchengAjayan, Pulickel M.2018-06-272018-06-272017Wang, Yan, Liu, Yang, Zhang, Jianfang, et al.. "Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dots." <i>Science Advances,</i> 3, no. 12 (2017) AAAS: https://doi.org/10.1126/sciadv.1701500.https://hdl.handle.net/1911/102283Atomically 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.engThis is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dotsJournal articlee1701500.fullhttps://doi.org/10.1126/sciadv.1701500