Xu Yanmin, Yan Lihe, Li Xiaoyu, Xu Huanhuan
Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Sci Rep. 2019 Feb 27;9(1):2931. doi: 10.1038/s41598-019-38929-5.
As heavy metal-free quantum dots, transition metal dichalcogenides (TMDs) and boron nitride (BN) quantum dots (QDs) have aroused great interest due to features such as good thermal conductivity, chemical stability, and unique optical properties. Although TMDs have been synthesized using different methods, most of these methods require time-consuming or complex steps, limiting the applications of TMDs. We propose a fast and simple method for the synthesis of high-quality molybdenum disulfide (MoS) QDs and tungsten disulfide (WS) QDs based on femtosecond laser ablation and sonication-assisted liquid exfoliation. The prepared MoS QDs and WS QDs were characterized by transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The resulting products possessed few-layered thickness with an average size of 3.7 nm and 2.1 nm. Due to the abundance of functional groups on their surface, the MoS QDs and WS QDs showed bright blue-green luminescence under UV irradiation. Our method offers a facile and novel synthetic strategy for TMDs QDs and other two-dimensional nanomaterial quantum dots, such as boron nitride quantum dots (BNQDs).
作为无重金属量子点，过渡金属二硫属化物（TMDs）和氮化硼（BN）量子点（QDs）因其良好的热导率、化学稳定性和独特的光学性质等特点而引起了极大的关注。尽管已经使用不同的方法合成了TMDs，但这些方法大多需要耗时或复杂的步骤，限制了TMDs的应用。我们提出了一种基于飞秒激光烧蚀和超声辅助液体剥离的快速简单方法来合成高质量的二硫化钼（MoS）量子点和二硫化钨（WS）量子点。通过透射电子显微镜、原子力显微镜、X射线光电子能谱和傅里叶变换红外光谱对制备的MoS量子点和WS量子点进行了表征。所得产物具有几层的厚度，平均尺寸分别为3.7纳米和2.1纳米。由于其表面存在大量官能团，MoS量子点和WS量子点在紫外光照射下呈现出明亮的蓝绿色发光。我们的方法为TMDs量子点和其他二维纳米材料量子点，如氮化硼量子点（BNQDs）提供了一种简便新颖的合成策略。
