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Materials 2015, 8(7), 3992-4003; doi:10.3390/ma8073992

Rapid Synthesis and Formation Mechanism of Core-Shell-Structured La-Doped SrTiO3 with a Nb-Doped Shell

National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan
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Academic Editor: Kunihito Koumoto
Received: 11 March 2015 / Revised: 14 June 2015 / Accepted: 24 June 2015 / Published: 2 July 2015
(This article belongs to the Special Issue Low-Dimensional Anisotropic Thermoelectrics)
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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. View Full-Text
Keywords: La-doped SrTiO3; nanocubes; Nb surface doping; hydrothermal method; core-shell structure; thermoelectric materials La-doped SrTiO3; nanocubes; Nb surface doping; hydrothermal method; core-shell structure; thermoelectric materials
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Park, N.-H.; Akamatsu, T.; Itoh, T.; Izu, N.; Shin, W. Rapid Synthesis and Formation Mechanism of Core-Shell-Structured La-Doped SrTiO3 with a Nb-Doped Shell. Materials 2015, 8, 3992-4003.

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