Synthesis of Silver Sulf ide Quantum Dots Via the Liquid–Liquid Interface Reaction in a Rotating Packed Bed Reactor  

作　　者：Qing Liu Yuan Pu Zhijian Zhao Jiexin Wang Dan Wang 

机构地区：[1]State Key Laboratory of Organic Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China [2]Research Center of the Ministry of Education for High Gravity Engineering and Technology,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Transactions of Tianjin University》2020年第4期273-282,共10页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21808009);the Beijing Natural Science Foundation(No.2182051).

摘　　要：We developed the high-gravity coupled liquid-liquid interface reaction technique on the basis of the rotating packed bed(RPB)reactor for the continuous and ultrafast synthesis of silver sulfide(Ag2S)quantum dots(QDs)with near-infrared(NIR)luminescence.The formation of Ag2S QDs occurs at the interface of microdroplets,and the average size of Ag2S QDs was 4.5 nm with a narrow size distribution.Ag2S QDs can disperse well in various organic solvents and exhibit NIR luminescence with a peak wavelength at 1270 nm under 980-nm laser excitation.The mechanism of the process intensification was revealed by both the computational fluid dynamics simulation and fluorescence imaging,and the mechanism is attributed to the small and uniform droplet formation in the RPB reactor.This study provides a novel approach for the continuous and ultrafast synthesis of NIR Ag2S QDs for potential scale-up.

关 键 词：Ag2S quantum dots Near-infrared luminescence Rotating packed bed Liquid-liquid interface reaction Process intensification 

分 类 号：O614.122[理学—无机化学] TB383.1[理学—化学]