Nanjing Tech University

About: Nanjing Tech University is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Membrane. The organization has 21827 authors who have published 21794 publications receiving 364050 citations. The organization is also known as: Nangongda & Nánjīng Gōngyè Dàxúe.

Great Influence of Anions for Controllable Synthesis of CeO2 Nanostructures: From Nanorods to Nanocubes

Abstract: Controllable synthesis of well-shaped nanocrystals is of significant importance for understanding the surface-related properties as well as for the exploration of potential applications Herein, CeO2 nanorods and nanocubes were selectively synthesized using cerium(III) chloride and cerium(III) nitrate as precursor, respectively Counter anions of the cerium source were crucial to the shapes of the resulting products Intriguingly, the as-synthesized nanorods could be converted into nanocubes by the addition of an appropriate amount of NO3− ions into the hydrothermal reaction The NO3− ions are considered as both a capping agent and an oxidizer during the formation of CeO2 nanocubes Moreover, the influences of several others anions are investigated Br−, I−, and SO42− ions have similar roles to Cl− ions, which lead to the formation of nanorods The introduction of BrO3− ions can bring on the generation of irregular nanoparticles because they can function as an oxidizer but not a capping agent The anion-i

Unveiling the additive-assisted oriented growth of perovskite crystallite for high performance light-emitting diodes.

Abstract: Solution-processed metal halide perovskites have been recognized as one of the most promising semiconductors, with applications in light-emitting diodes (LEDs), solar cells and lasers. Various additives have been widely used in perovskite precursor solutions, aiming to improve the formed perovskite film quality through passivating defects and controlling the crystallinity. The additive’s role of defect passivation has been intensively investigated, while a deep understanding of how additives influence the crystallization process of perovskites is lacking. Here, we reveal a general additive-assisted crystal formation pathway for FAPbI3 perovskite with vertical orientation, by tracking the chemical interaction in the precursor solution and crystallographic evolution during the film formation process. The resulting understanding motivates us to use a new additive with multi-functional groups, 2-(2-(2-Aminoethoxy)ethoxy)acetic acid, which can facilitate the orientated growth of perovskite and passivate defects, leading to perovskite layer with high crystallinity and low defect density and thereby record-high performance NIR perovskite LEDs (~800 nm emission peak, a peak external quantum efficiency of 22.2% with enhanced stability). Additives have been widely used for passivating defects in perovskite semiconductors, yet the role of additive and their interaction is not clear. Here, the authors reveal an additive-assisted crystal formation in FAPbI3 perovskite by tracking the chemical interaction in the precursor solution and crystallographic evolution using multi-functional additives.