Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Lead halide perovskite nanocrystals whether formed by their own nucleations and growths or by ion diffusion into the lattice of others are still in debate. Fast formation of these nanomaterials caste shades for understanding their growth mechanism. Hence, beyond isotropic nanocrystals like cubes and polyhedrons, fabricating anisotropic perovskite nanocrystals by design remained indeed difficult. Exploring the lattice of orthorhombic phase Cs2ZnBr4, and with complete ion exchange from Zn-tetrahedra to Pb-octahedra, dimension tunable anisotropic nanocrystals of CsPbBr3 are reported.[1] This B-site ion introduction led to CsPbBr3 nanorods having a major axis [100] contrary to all reports on rods and wires where lengths are along [001].[2], [3] Tuning reaction parameters, anisotropy in all three directions (length, breadth, and width) is tuned. This was possible by using derivatives of α-bromo ketones, which not only tuned shapes of Cs2ZnBr4 in all directions but also the facets of transformed CsPbBr3. This helped in obtaining square to rectangular rods and also disks of CsPbBr3 nanocrystals with major axis <100>. In all cases phase pure CsPbBr3 nanocrystals remained the exclusive product as both ZnBr42- tetrahedra and PbBr64- octahedra could not coexist together and in presence of insufficient Pb(II), intriguing hollow structures along two minor axes were obtained. While similar experiments were extended to orthorhombic Cs2HgBr4, standard nanorods with [001] as a major axis were observed. From these results, it is further concluded that perovskite nanocrystals might not follow any specific rules for directional growths, rather these acts like parasitic material and take shapes as per lattice arrangement in parent nanocrystals. Hence, the entire study not only led to new anisotropic nanostructures in different dimensions but also added new fundamentals for understanding the formation chemistry of these important nanomaterials.
Firstly I would like to express my sincere gratitude to my supervisor Prof. Narayan Pradhan for his valuable guidance and continuous encouragement. SERB and UGC are acknowledged for the funding and fellowship respectively. I also acknowledge the instrumental facilities of our institute, IACS. Last but not the least, I am thankful to my lab members for their help.
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