Unveiling the efficiency of microwave-assisted hydrothermal treatment for the preparation of SrTiO3 mesocrystals

Luís F. da Silva; Ariadne C. Catto; Waldir Avansi; Alexandre Mesquita; Lauro J. Q. Maia; Osmando F. Lopes; Máximo Siu Li; Mário L. Moreira; Elson Longo; Juan Andrés; Valmor R. Mastelaro

doi:10.1039/C9CP02893E

Unveiling the efficiency of microwave-assisted hydrothermal treatment for the preparation of SrTiO₃ mesocrystals†

Luís F. da Silva,

*^a Ariadne C. Catto,^a Waldir Avansi, Jr,^a Alexandre Mesquita,^b Lauro J. Q. Maia,^c Osmando F. Lopes,

^d Máximo Siu Li,^e Mário L. Moreira,^f Elson Longo,

^g Juan Andrés

^h and Valmor R. Mastelaro^e

Author affiliations

* Corresponding authors

^a Laboratory of Nanostructured Multifunctional Materials, Federal University of São Carlos, Rodovia Washington Luiz, km 235, São Carlos, SP, Brazil
E-mail: lfsilva83@gmail.com
Tel: 55 16 35091524

^b Institute of Geosciences and Exact Sciences, São Paulo State University, Unesp, Rio Claro, SP, Brazil

^c Institute of Physics, Federal University of Goiás, Alameda Palmeiras s/n, Goiânia, GO, Brazil

^d Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil

^e Institute of Physics of São Carlos, University of São Paulo, Avenida Trabalhador São Carlos, São Carlos, SP, Brazil

^f INCTMN, Physical and Mathematics Institute (IFM), Universidade Federal de Pelotas, Campus Universitário Capão do Leão, Pelotas, RS, Brazil

^g Center for Development of Functional Materials, Federal University of São Carlos, Rodovia Washington Luiz, km 235, São Carlos, SP, Brazil

^h Departamento Química-Física y Analítica, Universitat Jaume I, Castelló E-12080, Spain

Abstract

Material processing has become essential for the proper control, tuning and consequent application of the properties of micro/nanoparticles. In this case, we report herein the capability of the microwave-assisted hydrothermal (MAH) method to prepare the SrTiO₃ compound, as a case study of inorganic compounds. Analyses conducted by X-ray diffraction, X-ray photoelectron and X-ray absorption spectroscopies confirmed that the MAH route enables the formation of pristine SrTiO₃. The results indicated that the combination of thermal and non-thermal effects during the MAH treatment provides ideal conditions for an efficient and rapid synthesis of pristine SrTiO₃ mesocrystals. Scanning electron microscopy images revealed a cube-like morphology (of ca. 1 μm) formed via a self-assembly process, influenced by the MAH time. Additionally, photoluminescence measurements revealed a broad blue emission related to intrinsic defects, which decreased with the MAH synthesis time.

Physical Chemistry Chemical Physics

Unveiling the efficiency of microwave-assisted hydrothermal treatment for the preparation of SrTiO₃ mesocrystals†

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Physical Chemistry Chemical Physics