Shape-Control of Strontium Titanate Nanostructures by a Surface-Capping Soft Chemical Process
J. Korean Phy. Soc. 2008; 52: 466~470
Published online February 15, 2008 © 2008 The Korean Physical Society.

Abstract
A surface-controlling soft chemical process is reported for tuning the morphologies of strontium titanate (SrTiO$_3$) nanostructures. The conventional surfactant-free soft chemical process produced polycrystalline SrTiO$_3$ nanoparticle aggregates generated by the dissolution-growth reaction. Alternatively, in order to synthesize single-crystal SrTiO$_3$ nanorods, we employed the surface-capping soft chemical process using a polyacrylic acid (PAA) polymer capping-reagent. The single-crystal SrTiO$_3$ nanorods prepared using PAA were observed to have facets with different diameters from a few nm to $sim$200 nm, lengths up to several $mu$m, rectangular cross-sections, and crystal-axe perpendicular to the growth axis of the nanorods. A high-yield of nanorods over 90 \% was also obtained in the total volume of the product.
Keywords: Strontium titanate, Perovskite nanostructure, Soft chemical reaction, Dissolution-growthStrontium titanate, Perovskite nanostructure, Soft chemical reaction, Dissolution-growth reaction reaction


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