Self-Assembly of Three-Dimensional SrTiO₃ Microscale Superstructures and Their Photonic Effect

Abstract

3D SrTiO3 microscale superstructures (STOMSs) have been prepared via hydrothermal synthesis and multiple (five times) crystallization process. Branches and trunks on STOMSs show perfect corn-like structures, and each side of the trunks could be considered as grating-analogous structures. These well-ordered trunks along with gratings constitute 3D hybrid microstructures that contribute to light diffraction, and the colorful photonic effects of light diffraction are thought to be due to refractive index modulations in three dimensions. The colors of STOMSs can be tuned from yellow to cyan by changing the growth cycle. This special optical performance could broaden the application scope of SrTiO3.

Crystal facet tailoring arts in perovskite oxides

“…3D SrTiO 3 microscale superstructures have been prepared via the hydrothermal method by self-assembly (SA) behaviour. 92 Buscaglia et al reported size and shape control of SrTiO 3 particles grown by the epitaxial self-assembly method by adding organic molecules, in which the size of SrTiO 3 was well-controlled, 93 to the shape or crystal facets; however, it is still not as good as that of noble metal nanocrystals. SrTiO 3 nanocubes with an average length of ca.…”

Correlation between Multiple Growth Stages and Photocatalysis of SrTiO3Nanocrystals

“…6−10 For example, Souza et al 11 reported that the photoluminescence of STO could be modified through controlling the growth steps. Recently, a variety of STO nanostructures, such as nanosheets, 12 mesocrystals, 13,14 mesoporous structures, 15−18 hollow spheres, 19 superstructures, 20,21 and hybrid structures, 22−25 have been widely studied. Their structures have been well addressed; however, the correlation between their structures, properties, and growth mechanism(s) has not been clearly revealed.…”

NaCl–H2O-assisted preparation of SrTiO3 nanoparticles by solid state reaction at low temperature

“…[5][6][7][8][9][10][11] Recently, a variety of SrTiO 3 nanoparticles with specific morphologies (e.g., nanocuboids, nanospheres, nanoparticles, nanosheets, nanowires, nanotubes, and microscale superstructures) have been prepared via high-temperature solidstate reaction, microemulsion, molten salt methods, hydrothermal or solvothermal methods, sol-gel methods, etc. [12][13][14][15][16][17][18][19] However, these methods suffer several problems associated with the environmental load and economical performance. Hydrothermal/solvothermal growth, sol-gel process, and precipitation have several disadvantages such as expensiveness of equipments and reagents, toxicity of the solvents, and complexity of the processes.…”