Publikationsdatum:
2017-12-16
Beschreibung:
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, MoS 2 , WS 2 , h-BN, TiS 2 , NbS 2 , Bi 2 Se 3 , MoTe 2 , Sb 2 Te 3 , 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.
Digitale ISSN:
2375-2548
Thema:
Allgemeine Naturwissenschaft
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