Zhong Qixuan, Cao Muhan, Hu Huicheng, Yang Di, Chen Min, Li Pengli, Wu Linzhong, Zhang Qiao
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices , Soochow University , 199 Ren'ai Road , Suzhou 215123 , Jiangsu , People's Republic of China.
ACS Nano. 2018 Aug 28;12(8):8579-8587. doi: 10.1021/acsnano.8b04209. Epub 2018 Jul 17.
The practical applications of CsPbX nanocrystals (NCs) have been limited by their poor stability. Although much effort has been devoted to making core-shell nanostructures to enhance the stability of CsPbX NCs, it is still very difficult to coat CsPbX NCs with another material on a single-particle level. In this work, we report a facile one-pot approach to synthesize CsPbBr@SiO core-shell nanoparticles (NPs), in which each core-shell NP has only one CsPbBr NC. The formation process has been carefully monitored. It has been found that the formation rates, determined by reaction temperature, precursor species, pH value, etc., of both CsPbBr and SiO are critical for the successful preparation of core-shell NPs. Thanks to the protection of SiO shell, the product shows much higher long-term stability in humid air and enhanced stability against ultrasonication treatment in water than that of naked CsPbBr NCs. This work not only provides a robust method for the preparation of core-shell nanostructures but also sheds some light on the stabilization and applications of CsPbX NCs.
CsPbX纳米晶体（NCs）的实际应用因其稳定性差而受到限制。尽管人们付出了很多努力来制备核壳纳米结构以提高CsPbX NCs的稳定性，但在单颗粒水平上用另一种材料包覆CsPbX NCs仍然非常困难。在这项工作中，我们报道了一种简便的一锅法来合成CsPbBr@SiO核壳纳米颗粒（NPs），其中每个核壳NP仅含有一个CsPbBr NC。对形成过程进行了仔细监测。已发现，由反应温度、前驱体种类、pH值等决定的CsPbBr和SiO的形成速率对于成功制备核壳NPs至关重要。得益于SiO壳的保护，该产物在潮湿空气中表现出更高的长期稳定性，并且在水中比裸露的CsPbBr NCs具有更强的抗超声处理稳定性。这项工作不仅为制备核壳纳米结构提供了一种可靠的方法，也为CsPbX NCs的稳定性和应用提供了一些启示。
