A fast and template free synthesis of Tb:Y2O3 hollow microspheres via supercritical solvothermal method

M. Kempaiah Devaraju; Shu Yin; Tsugio Sato

doi:10.1021/cg9002934

A fast and template free synthesis of Tb:Y₂O₃ hollow microspheres via supercritical solvothermal method

M. Kempaiah Devaraju, Shu Yin, Tsugio Sato

IMRAM - Division of Inorganic Material Research

Tohoku University

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

The design of template-free hollow microspheres in a very short period of time will be of great importance to save energy and time and allow rapid production. We succeeded in the rapid synthesis of precursor material via a supercritical solvothermal method followed by subsequent heating to obtain Tb:Y₂O₃ hollow microspheres. The prepared precursor material was actually composed of Y(OH)₃ and Y(OH)CO₃ phases. The hollow microspheres seemed to be formed through the aggregation of nanoparticles under supercritical conditions. The formation mechanism of hollow microspheres in the present synthesis is the Ostwald ripening process. Effects of reaction temperature and pH of the starting solution were investigated to understand the effect on the formation of hollow microspheres. Well-shaped Tb:Y₂O₃ hollow microspheres showed strong green emission at 540 nm under 304 nm light excitation. The effect of doping concentrations and calcinations temperature was investigated.

Original language	English
Pages (from-to)	2944-2949
Number of pages	6
Journal	Crystal Growth and Design
Volume	9
Issue number	6
DOIs	https://doi.org/10.1021/cg9002934
Publication status	Published - 2009 Jun 3

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abstract = "The design of template-free hollow microspheres in a very short period of time will be of great importance to save energy and time and allow rapid production. We succeeded in the rapid synthesis of precursor material via a supercritical solvothermal method followed by subsequent heating to obtain Tb:Y2O3 hollow microspheres. The prepared precursor material was actually composed of Y(OH)3 and Y(OH)CO3 phases. The hollow microspheres seemed to be formed through the aggregation of nanoparticles under supercritical conditions. The formation mechanism of hollow microspheres in the present synthesis is the Ostwald ripening process. Effects of reaction temperature and pH of the starting solution were investigated to understand the effect on the formation of hollow microspheres. Well-shaped Tb:Y2O3 hollow microspheres showed strong green emission at 540 nm under 304 nm light excitation. The effect of doping concentrations and calcinations temperature was investigated.",

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AU - Devaraju, M. Kempaiah

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AU - Sato, Tsugio

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AB - The design of template-free hollow microspheres in a very short period of time will be of great importance to save energy and time and allow rapid production. We succeeded in the rapid synthesis of precursor material via a supercritical solvothermal method followed by subsequent heating to obtain Tb:Y2O3 hollow microspheres. The prepared precursor material was actually composed of Y(OH)3 and Y(OH)CO3 phases. The hollow microspheres seemed to be formed through the aggregation of nanoparticles under supercritical conditions. The formation mechanism of hollow microspheres in the present synthesis is the Ostwald ripening process. Effects of reaction temperature and pH of the starting solution were investigated to understand the effect on the formation of hollow microspheres. Well-shaped Tb:Y2O3 hollow microspheres showed strong green emission at 540 nm under 304 nm light excitation. The effect of doping concentrations and calcinations temperature was investigated.

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A fast and template free synthesis of Tb:Y₂O₃ hollow microspheres via supercritical solvothermal method

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