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Synthesis and Thermoelectric Properties in the 2D Ti1 xNbxS3 Trichalcogenides
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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
Materials 2015, 8(7), 3992-4003; https://doi.org/10.3390/ma8073992
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)
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
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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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