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Investigation on the Synthesis,Microstructure and Optical Properties of One-dimensional KTa1-xNbxO3Nanomaterial

Author: TaoYiBo
Tutor: GuHaoShuang
School: Hubei University
Course: Microelectronics and Solid State Electronics
Keywords: KTa0.25Nb0.75O3 Nanomaterials Microsturcture Hydrothermal Opticalproperties
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 24
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Abstract


Single-crystalline KTa0.25Nbo.75O3(KTN) nanorods with an orthorhombic perovskite structure were synthesized by a polymer-assisted hydrothermal method. The preferred crystallographic orientation of the nanorods were found to be controllable by using different types of polymers in the process; that is,[001]-oriented KTN were obtained with the use of polyvinyl alcohol (PVA) and [110]-oriented ones were formed with the use of a combination of polyacrylic acid (PAA) and PVA. The two types of nanorods showed different photocatalytic property and the [001]-oriented nanorods exhibited a better photocatalytic decolorization efficiency than the [110] ones.(1) In the mineralization agent10mol/l concentration, temperature of200℃heat and water conditions, with PVA respectively and PVA+PAA as surfactant, synthetic the different growth direction trapezius perovskite crystal structure KTN nano great. XRD and TEM characterization, according to the results of the use of PVA surfactant auxiliary water hot growth get [001] of the direction of KTN nano stick, and use at the same time when PVA PAA and can get [110] direction of nano great growth. In addition, and adding8.8M KOH and0.16g’s PEG formation60～200nm in diameter, up to3μ M length of karst KTa0.25Nb0.75O3nano structure diameter is about200nm, length of5μm.. Nano stick by K, Ta, Nb, O four of the elements, along the great axial distribution even. Growth direction for [001]。(2) Combined with the ball mill and hydrothermal synthesis process in150℃heat treatment won the orthogonal perovskite structure KNbO3nano materials, get KNbO3nano great size distribution even,in about5nm size. The hot water temperature on the influence of the product of an object is, determined the pure phase KNbO3nanometer material formed the crystallization temperature. The study KNbO3nano good microstructure and room temperature optical properties, KNbO3nano great optical band gap in3.76eV or so, in room temperature wavelength in551and597nm respectively near launch peak, KNbO3nano great room temperature display of perovskite structure phonon vibration behavior.

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