Preparation method for necklace shaped lead titanate nano wire

Abstract

The invention provides a method for preparing the necklace-shaped lead titanate nano-wire, which comprises the following steps: firstly forming a complex ion [TiO(C2O4)2]<2-> by reacting a titanic acid ester or a soluble titanium salt with an oxalic acid solution, then preparing two uniform and transparent microemulsions containing Pb<2+> and [TiO(C2O4)2]<2-> by respectively mixing a surface active agent, a cosurfactant and a fat phase with a soluble lead salt solution and the [TiO(C2O4)2]<2->solution; mixing the two microemulsions containing Pb<2+> and [TiO(C2O4)2]<2->, stirring for reaction, then aging, centrifugal separating, washing, drying and calcining to get the necklace-shaped lead titanate nano-wire with the length about 450 nm to 2200 nm, and the wider diameter about 60 to 145 nm and the narrower diameter about 40 to 115 nm. The method can conveniently control the size and the shape of the particles of the product, and has the advantages of simple production technique, safe production process, uneasy agglomeration and damage of the particles of the product, high purity of the product, high production efficiency and low implementation cost, and can be widely used for preparing the nano materials with different shapes.

Description

technical field [0001] The invention relates to a method for preparing inorganic functional nanometer materials, in particular to a method for preparing necklace-like lead titanate nanowires by adopting an inverse microemulsion method. Background technique [0002] Lead titanate (PbTiO 3 ) is a ferroelectric material with a perovskite structure, because it has the advantages of high Curie temperature (greater than 490 ° C), small dielectric constant and large pyroelectric coefficient, as well as excellent pyroelectric, piezoelectric, Ferroelectric, electro-optic and other properties have been generally valued by people. It is an important material for making high-frequency filters, infrared detectors, ultrasonic transducers and electro-optical devices. The traditional preparation method of lead titanate powder is a high-temperature solid-phase method, which is to combine PbO and TiO 2 It is prepared by high-temperature combustion after mixing. Since the reaction is betwee...

AI Technical Summary

Problems solved by technology

The traditional preparation method of lead titanate powder is a high-temperature solid-phase method, which is to combine PbO and TiO 2 It is prepared by burning at high temperature after mixing. Since the reaction is between solid phase and solid phase and is completed at high temperature, the reaction is uneven, the reactivity is poor, the product has large particle size and low purity.

In order to overcome the shortcomings of the solid-phase method, wet chemical preparation methods have received more and more attention, including chemical co-precipitation, hydrothermal, sol-gel methods, etc., but these methods still have some shortcomings: the chemical co-precipitation method prepared Although the chemical uniformity of the powder has been improved, the calcination temperature is still high, the particle size is large and the particle size distribution is uneven; the production cost of the sol-gel method is high, and the production process is difficult to control; the hydrothermal method needs to use high-pressure equipment. In order to avoid the danger of the production process, the product particles are easy to agglomerate

The above methods have defects such as low production efficiency, low product yield, serious nanowire agglomeration, easy collapse and destruction of nanowires after removing the support, and difficult removal of impurities in nanowires.

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