Synthesis and Characterization of Monodispersive Indium oxide-In2O3 and Strontium Indate-SrIn2O4
Date Issued
2004
Date
2004
Author(s)
Lin, Sung-En
DOI
en-US
Abstract
The objectives of this study were to synthesize submicron, monodispersive In2O3 and SrIn2O4 particles through a hydrothermal or spray pyrolysis processes. In order to control the morphologies of the particles, the formulations used PVP (polyvinylpyrrolidone) and urea as the additives. By using X-ray diffractometer (XRD), thermogravimetry analyst (TGA), differential scanning calorimetry (DSC), transmission electron microscope (TEM), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), inductively coupled plasma- optical emission spectrometry (ICP-OES) and photoluminescence (PL), the properties of those particles were analyzed. The kinetics of the hydrolysis reaction of In3+ was studied, and showed that oval-shape or stick-like InOOH particles precipitated first, then grew to cubic In(OH)3 particles in the hydrothermal process. The precipitation kinetics was studied to be the zero order reaction with an activation energy of 128 kJ/mol and controlled by the decomposition kinetic of urea. The influence of Sr+2 additive, synthesizing temperature, concentration of urea and PVP agents was investigated. Calcination of the hydrates to form In2O3 particles by heating over than 300oC was conducted, and the original morphologies could be maintained when those precipitates were calcined at 900oC. The 830oC and 930oC calcined In2O3 particles showed characteristic photoluminescence properties in blue light range. The possible route for the synthesis of spherical SrIn2O4 particles was tried and discussed.
Subjects
均一分佈
均質析出
動力學
尿素
水解
氧化銦
homogeneous precipitation
urea
kinetic
In2O3
monodispersive
SrIn2O4
hydrolysis
Type
thesis
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