Influence of periodic flow field on synthesis of perovskite nanocrystals: Synthetic pathway and productivity

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-02, Vol.454, p.140519, Article 140519
• Main Authors: Jee, Ye Chan, Kim, Woo-Sik, Im, Sang Hyuk
• Format: Article
• Language: English
• Subjects: Couette-Taylor; Hot-injection; Periodic flow fields; Perovskite nanocrystals; Taylor vortex
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.140519

[Display omitted] •Pervoskite nanocrystals were synthesized in a periodic Taylor vortex flow and a random turbulent eddy flow.•Chemical reactions were more promoted in a periodic Taylor vortex flow than a random turbulent eddy flow.•Chemical reaction pathway for CsPbBr3 and Cs4PbBr6 nanocrystals was selective in periodic Taylor vortex flows.•Pure CsPbBr3 and Cs4PbBr6 could be synthesized to high yield in the periodic Taylor vortex flow. Here it was demonstrated that series–parallel reaction pathway for CsPbBr3 and Cs4PbBr6 perovskite nanocrystals (PNCs) were selective by the periodic flow fields as well as precursor ratio. The periodic Taylor vortex flows (PTVFs) in a Couette-Taylor batch reactor (BR) were applied for controlling the synthetic pathway of PNCs and the random turbulent eddy flow (RTEF) in a stirred tank BR was also used for comparison. The PTVFs in the Couette-Taylor BR promoted not only the formation reaction of CsBr from the reaction between Cs-oleate (Cs-OA) and PbBr2 but also the reaction between CsBr and the remained PbBr2. As a result, the CsPbBr3 and Cs4PbBr6 PNCs could be selectively formed according to the ratio of Cs-OA:PbBr2 under the PTVFs in the Couette-Taylor BR, whereas they couldn’t under the RTEF in the stirred tank BR. In addition, the production yield of CsPbBr3 and Cs4PbBr6 PNCs in Couette-Taylor BR increased up to 30 % and 57 %, respectively, compared to their yield in the stirred tank BR due to the effective micro-mixing and shear dispersion of PNCs.