Bismuth sodium titanate nanometer flower and preparation method thereof

Abstract

The invention discloses a bismuth sodium titanate nanometer flower and a preparation method thereof. The nanometer flower comprises crossed vertical nanometer sheets which have the length of 250 nm to 350 nm, the height of 50 nm to 150 nm and the thickness of 5 nm to 15 nm and are made of monocrystal perovskite bismuth sodium titanate. The method comprises the following steps: firstly, adding ammonia to a citric acid aqueous solution with the density of 0.8M to 1.2M and adjusting a pH value to be between 4.5 and 6; adding tetrabutyl titanate and stirring at 50 DEG C to 70 DEG C for longer than 5 hours to obtain a clear solution; then, mixing a bismuth nitrate pentahydrate aqueous solution with the clear solution and stirring at 80 DEG C to 100 DEG C for longer than 30 minutes to obtain a mixed solution; afterwards, adding sodium hydroxide to the mixed solution and continuously stirring for longer than 15 minutes to obtain a synthetic solution; later, keeping the synthetic solution at 80 DEG C to 180 DEG C for 0 to 10 hours and washing to be neutral to obtain a product; and finally, drying the product to obtain the bismuth sodium titanate nanometer flower. The invention can be widely applied to the fields of machinery, electrons, precise control, and the like.

Description

technical field [0001] The invention relates to a nano flower and a preparation method, in particular to a sodium bismuth titanate nano flower and a preparation method thereof. Background technique [0002] Sodium bismuth titanate is a very important ABO as a lead-free substitute for ferroelectric materials 3 The functional materials with perovskite structure have a wide range of applications in the fields of machinery, electronics, and precision control. Using its dielectric properties, ceramic capacitors can be made; when used as piezoelectric materials, it can be prepared into various sensors, high-temperature piezoelectric devices, piezoelectric transducers, and driving devices. The nanostructure of sodium bismuth titanate has aroused extensive attention of scientific researchers because of its large specific surface area. In order to explore and expand its application scope, people have made some attempts and efforts, such as the "Electronics" published in November 200...

AI Technical Summary

Problems solved by technology

However, there are deficiencies in both the product and the preparation method. First, the shape of the product is spherical or cubic, rather than a nanoflower structure, especially not a nanoflower structure composed of nanosheets.

This spherical or cubic nano-scale sodium bismuth titanate, because of its lower dielectric constant and higher dielectric loss, makes its ferroelectric properties different from that of traditional lead zirconate titanate (PbTiO 3 -PbZrO 3 , abbreviated as PZT) there is still a certain gap; secondly, the preparation method can neither produce sodium bismuth titanate with a nanoflower structure composed of nanosheets, nor disclose specific production process parameters, and even uses organic ethanol as a solvent , which increases the cost of making

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