Abstract
To provide a convenient and practical synthesis process for metal ion doping on the surface of nanoparticles in an assembled nanostructure, core-shell-structured La-doped SrTiO3 nanocubes with a Nb-doped surface layer were synthesized via a rapid synthesis combining a rapid sol-precipitation and hydrothermal process. The La-doped SrTiO3 nanocubes were formed at room temperature by a rapid dissolution of NaOH pellets during the rapid sol-precipitation process, and the Nb-doped surface (shell) along with Nb-rich edges formed on the core nanocubes via the hydrothermal process. The formation mechanism of the core-shell-structured nanocubes and their shape evolution as a function of the Nb doping level were investigated. The synthesized core-shell-structured nanocubes could be arranged face-to-face on a SiO2/Si substrate by a slow evaporation process, and this nanostructured 10 μm thick thin film showed a smooth surface.
Highlights
Perovskite-type oxides are an incredibly fascinating material due to their widespread applications in electronics, energy storage devices, catalysts, and sensors [1,2,3,4,5,6]
In our previous work on realizing the proposed 3D model structure via solution synthesis, we synthesized SrTiO3 mesocrystals with a well-defined cubic shape 60 nm in size through an oriented attachment and crystallographic fusion of small scale primary SrTiO3 nanoparticles using an organic material [19], and the synthesis process of La-doped SrTiO3 nanocubes having a core-shell structure have been suggested for doping its surface using the metal ions [20]
The sealed autoclave was heated to 200 °C and kept for 24 h under mechanical stirring to form the Nb-doped surface on the La-doped SrTiO3 nanocubes (Nb-LaSTO), followed by cooling to room temperature
Summary
Perovskite-type oxides are an incredibly fascinating material due to their widespread applications in electronics, energy storage devices, catalysts, and sensors [1,2,3,4,5,6]. Ordered nanoparticle superstructures and three-dimensional (3D) architectures have attracted extensive attention because of their large specific areas, number of interface and active sites for transport, and reactions such as mesocrystals and supernanoparticles [14,15,16,17] For these reasons, a cubic morphology has attracted extensive interest, as it is considered the ideal candidate for forming close-packed ordered structures and 3D architectures. In our previous work on realizing the proposed 3D model structure via solution synthesis, we synthesized SrTiO3 mesocrystals with a well-defined cubic shape 60 nm in size through an oriented attachment and crystallographic fusion of small scale primary SrTiO3 nanoparticles using an organic material [19], and the synthesis process of La-doped SrTiO3 nanocubes having a core-shell structure have been suggested for doping its surface using the metal ions [20]. To obtain a spontaneously assembled nanocube structure for thermoelectric applications, thin films are fabricated by a slow evaporation process on a SiO2/Si substrate
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