我院刘洋教授在《Materials Today》上发表论文

近日，我院刘洋教授的论文《Reflux pretreatment-mediated sonication A new universal route to obtain 2D quan》在《Materials Today》上发表，该刊物属于JCR大类1区、TOP期刊。

尽管基于二维(2D)材料的量子点(QD)在许多领域展示出引人瞩目的性质和良好的应用前景，但是仍然缺乏廉价简便的制备原子级厚度且高效的2DQD的方法。在这篇文章中，课题组首次演示了使用回流预处理超声介导方法，制备一系列超薄2D量子点（例如，石墨烯、TiS2、MoS2、MoSe2、WSe2、NbS2、SnS2和h-BN量子点）。

Absract：

Although quantum dots (QDs) based on two dimensional (2D) materials have manifested fascinating properties and promising applications in a wide range of fields, a low cost and non-tedious approach for the preparation of atomically thick 2D QDs with high yield remains elusive. Herein, for the first time, we demonstrate a reflux pretreatment-mediated sonication approach to produce a series of ultrathin 2D QDs (e.g., graphene, TiS2, MoS2, MoSe2, WSe2, NbS2, SnS2, and h-BN QDs) from their bulk counterparts. The solvent molecules, confined in the channels of layered materials during reflux, assist the delamination and fracture of 2D sheets in the process of bath sonication. The resulting 2D QDs exhibited uniform lateral size distribution of 2–7 nm and a mean thickness of 0.8–1 nm, almost identical to the monolayer thickness of layered materials. To demonstrate the unique property of these 2D QDs, the optical limiting activity was studied using open aperture z-scan technique. TiS2 QDs exhibited appreciable nonlinear optical limiting, reaching 50% by a tapered and sharp absorption at input laser fluence of 4.24 GW/cm2.