SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 59 ›› Issue (7): 32-41.DOI: 10.1016/j.cjche.2022.12.001

• Full Length Article • 上一篇    下一篇

Ultrasonic cavitation-enabled microfluidic approach toward the continuous synthesis of cesium lead halide perovskite nanocrystals

Mingzhi Li1,2, Zhikai Liu1,2, Wang Yao1,2, Chao Xu1,2, Yangping Yu1,2, Mei Yang1, Guangwen Chen1   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2022-09-08 修回日期:2022-11-28 出版日期:2023-07-28 发布日期:2023-10-14
  • 通讯作者: Mei Yang,E-mail:yangmei@dicp.ac.cn
  • 基金资助:
    We would like to acknowledge the financial supports from National Natural Science Foundation of China (22178336 and 21991103).

Ultrasonic cavitation-enabled microfluidic approach toward the continuous synthesis of cesium lead halide perovskite nanocrystals

Mingzhi Li1,2, Zhikai Liu1,2, Wang Yao1,2, Chao Xu1,2, Yangping Yu1,2, Mei Yang1, Guangwen Chen1   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-09-08 Revised:2022-11-28 Online:2023-07-28 Published:2023-10-14
  • Contact: Mei Yang,E-mail:yangmei@dicp.ac.cn
  • Supported by:
    We would like to acknowledge the financial supports from National Natural Science Foundation of China (22178336 and 21991103).

摘要: Ligand assisted reprecipitation (LARP) is a widely used method for cesium lead halide perovskite nanocrystals (NCs) synthesis. Nevertheless, the ultrafast kinetics of LARP, as well as the inefficient transport properties and discontinuity of batch reactors, challenge the particle size control and experimental repeatability. To address these issues, an ultrasonic cavitation-enabled microfluidic approach was developed to achieve the continuous synthesis of cesium lead halide perovskite via LARP. It was found that the mixing between the good solvent and antisolvent in the microchannel was greatly enhanced by intensive ultrasonic cavitation. The mixing time could be reduced to below 10 ms under the irradiation of 35 W ultrasound. By modulating the mixing degree, LARP was proved to be a mixing-sensitive process. The effects of ultrasonic power, ultrasonic treatment time, total flow rate, water additive, and reprecipitation temperature on the synthesis of CsPbBr3 NCs were systematically investigated. As compared to CsPbBr3 NCs synthesized in the batch reactor, the sample synthesized via the ultrasonic cavitation-enabled microfluidic approach possessed stronger photoluminescence intensity and better repeatability. Moreover, the ultrasonic cavitation-enabled microfluidic approach could also realize the continuous synthesis of cesium lead halide perovskite NCs with different halide compositions to cover a wide visible spectrum (426-661 nm). The ultrasonic cavitation-enabled microfluidic approach paved the way for the large-scale of high-quality cesium lead halide perovskite NCs.

关键词: Microreactor, Ultrasound, Mixing, CsPbBr3 nanocrystals, Synthesis

Abstract: Ligand assisted reprecipitation (LARP) is a widely used method for cesium lead halide perovskite nanocrystals (NCs) synthesis. Nevertheless, the ultrafast kinetics of LARP, as well as the inefficient transport properties and discontinuity of batch reactors, challenge the particle size control and experimental repeatability. To address these issues, an ultrasonic cavitation-enabled microfluidic approach was developed to achieve the continuous synthesis of cesium lead halide perovskite via LARP. It was found that the mixing between the good solvent and antisolvent in the microchannel was greatly enhanced by intensive ultrasonic cavitation. The mixing time could be reduced to below 10 ms under the irradiation of 35 W ultrasound. By modulating the mixing degree, LARP was proved to be a mixing-sensitive process. The effects of ultrasonic power, ultrasonic treatment time, total flow rate, water additive, and reprecipitation temperature on the synthesis of CsPbBr3 NCs were systematically investigated. As compared to CsPbBr3 NCs synthesized in the batch reactor, the sample synthesized via the ultrasonic cavitation-enabled microfluidic approach possessed stronger photoluminescence intensity and better repeatability. Moreover, the ultrasonic cavitation-enabled microfluidic approach could also realize the continuous synthesis of cesium lead halide perovskite NCs with different halide compositions to cover a wide visible spectrum (426-661 nm). The ultrasonic cavitation-enabled microfluidic approach paved the way for the large-scale of high-quality cesium lead halide perovskite NCs.

Key words: Microreactor, Ultrasound, Mixing, CsPbBr3 nanocrystals, Synthesis