title: Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation.
abstract: Intense ultrasound in a pressurized batch reactor was used for preparation of monolayered MoS2 nanosheets from natural mineral molybdenite. Exfoliation of bulk MoS2 using ultrasound is an attractive route to large-scale preparation of monolayered crystals. To evaluate the quality of delamination, methods like X-ray diffraction, Raman spectroscopy and microscopic techniques (TEM and AFM) were employed. From single- or few-layered products obtained from intense sonication, MoS2 quantum dots (MoSQDs) were prepared by a one-pot reaction by refluxing exfoliated nanosheets of MoS2 in ethylene glycol under atmospheric pressure. The synthesised MoSQDs were characterised by photoluminescence spectroscopy and laser-scattering particle size analysis. Our easy preparation leads to very strongly green luminescing quantum dots.
authors: Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., 250 68 Řež, Czech Republic. stengl@iic.cas.cz
authors: Václav
authors: V
authors: Štengl
authors: Jiří
authors: J
authors: Henych