题目：Interfacial Structural Transformation for the Synthesis of Lead-Free Double Perovskite Nanocrystals
作者：Jun Liu1,2, Anna A Vedernikova3, Qi Xue2,4,*, Huiying Gao4, Xiuhui Xie1,2, Jinfeng Xie1,2, Elena V Ushakova3,5, He Huang1,2,*, Xiaohong Zhang6,*
单位：
1School of Optoelectronic Science and Engineering &, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, P. R. China
2Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province &, Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, P. R. China
3International Research and Education Centre for Physics of Nanostructures, ITMO University, Saint Petersburg 197101, Russia
4School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China
5Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong, SAR 999077, P. R. China
6Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, P. R. China
摘要：
Lead-free halide double perovskite nanocrystals have emerged as one of the most promising alternatives to lead halide perovskite nanocrystals due to their non-toxicity, high stability, and outstanding optoelectronic properties. However, conventional synthesis methods often result in impurities due to increased constituent elements. In this study, we introduce an efficient water-oil biphasic interface-driven approach for synthesizing lead-free double perovskite nanocrystals, enabling controlled structural transformations from zero-dimensional (0D) to two-dimensional (2D) and three-dimensional (3D) structures. Starting from 0D Cs3BiBr6, we achieve a gradual cation exchange, forming 3D Cs2AgBiBr6. Real-time monitoring revealed the slow insertion of Ag+ ions as the key to the structural transformation. The resulting Cs2AgBiBr6 nanocrystals exhibit exceptional stability, maintaining their integrity for over 120 days under ambient conditions without significant degradation, showing no considerable material decomposition. Additionally, this method allows for the successful synthesis of 2D layered double perovskite Cs4ZnBi2Br12, which has not previously been reported in experimental studies. This biphasic synthesis strategy provides a universal and reliable method for producing high-quality double perovskite nanocrystals while offering valuable insights into their structural dynamics and properties.
无铅卤化物双钙钛矿纳米晶因其无毒性、高稳定性及优异的光电性能，被认为是取代铅卤化物钙钛矿纳米晶的最有前景的选择之一。然而，传统合成方法因组成元素增多，往往导致杂质的产生。在本研究中，我们提出了一种高效的水-油双相界面驱动策略，用于合成无铅双钙钛矿纳米晶，并实现从零维（0D）到二维（2D）及三维（3D）结构的可控转变。以0DCs3BiBr6为起始材料，我们通过逐步的阳离子嵌入成功获得3DCs2AgBiBr6。实时监测表明，Ag+离子的缓慢插入是该结构转变的关键。所得到的Cs2AgBiBr6纳米晶表现出卓越的稳定性，在环境条件下可保持120天以上而无明显降解或材料分解。此外，该方法还成功合成了实验研究中尚未报道的2D层状双钙钛矿Cs4ZnBi2Br12。这一双相合成策略不仅提供了一种普适且可靠的高质量双钙钛矿纳米晶制备方法，还为其结构演变及性质研究提供了重要的科学见解。
影响因子：14.3
链接：//advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202416046