Monolayer single crystal two-dimensional quantum dots via ultrathin cutting and exfoliating  

超薄切片与剥离制备单层单晶二维量子点

作　　者：Yang Hao Wen Su Lingxiang Hou Xueping Cui Shaozhi Wang Pengxin Zhan Ye Zou Louzhen Fan Jian Zheng 郝阳;宿雯;侯凌翔;崔雪萍;王少芝;占鹏鑫;邹业;范楼珍;郑健(Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of the Chinese Academy of Sciences,Beijing 100049,China;College of Chemistry,Beijing Normal University,Beijing 100875,Chind)

机构地区：[1]Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]College of Chemistry,Beifing Normal University,Beijing 100875,Chind

出　　处：《Science China Materials》2020年第6期1046-1053,共8页中国科学（材料科学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(21573253);the National Key Research and Developmet Program of China(2017YFA0204700);the Strategic Priority Research Programme of the Chinese Academy of Sciences(XDB12010000).

摘　　要：Two-dimensional(2D)atomically thin quantum dots(QDs)possess extraordinary electrical and optical properties.However,fabricating high quality 2D QDs via a universal and reliable technique remains a challenge.Here,we report a simple strategy to prepare high quality,monolayer single crystal 2D QDs via ultrathin cutting 2D bulk single crystals by ultramicrotome,followed by an exfoliation process.The as-prepared 2D QDs have pristine surface,high quality,high monolayer yield and high photoluminescence quantum yield(the highest photoluminescence quantum yield of WS2 is18%),which can be used as promising,low toxic,biocompatible,and good cell-permeability fluorescent labeling agents for in vitro imaging.二维(2D)原子级薄量子点(QDs)具有非凡的电学和光学性能.但是用于制备高质量2D量子点的通用、可靠技术仍然面临挑战.本文中,我们报道了一种简单的用超薄切片机垂直切割2D块体单晶,然后通过剥离来制备高质量单层单晶2D量子点的方法.所制备的2D量子点具有原始表面、高质量、高单层产率和高光致发光量子产率(WS2具有最高的光致发光量子产率18%).所制备的单层单晶二维量子点可作为一种有前途的低毒、生物相容性好、具有良好细胞通透性的荧光标记试剂.

关 键 词：two-dimension single crystal quantum dots ultrathin cutting photoluminescence quantum yield 

分 类 号：TB383.1[一般工业技术—材料科学与工程]