Bismuth titanate single crystal nanosheets modified by lanthanum ferrite doping and preparation method thereof

Abstract

The invention discloses lanthanum ferrite-doped modified bismuth titanate single-crystal nanosheets and a preparation method thereof. The method comprises the following steps that 1, bismuth nitrate,lanthanum nitrate, ferric nitrate and butyl titanate are weighed according to a stoichiometric ratio; 2, the bismuth nitrate, the lanthanum nitrate and the ferric nitrate weighed in the step 1 are dissolved in water to obtain a solution, an absolute ethyl alcohol solution of the butyl titanate is added into the obtained solution, and stirring is conducted to make a mixture mixed evenly, so that asolution A is obtained; 3, NaOH is dissolved in water to obtain a solution B, the solution B is added into the solution A, and after stirring is conducted for full reaction, a yellow turbid liquid precursor is obtained; 4, the turbid liquid precursor is transferred into a hydrothermal reactor, the reactor is placed in an oven, the oven is sealed, hydrothermal treatment is conducted at 200-220 DEGC for 72-96 h, and after reaction is carried out, a product is subjected to subsequent treatment to obtain a target product. The method is simple in preparation process, environmentally friendly and low in cost, efficient large-scale synthetic production can be achieved, and the single-crystal nanosheets prepared through the method are self-assembled to form a flower shape and have good light absorption performance.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to bismuth titanate single crystal nanosheets modified by lanthanum ferrite doping and a preparation method thereof. Background technique [0002] Bi-containing layered perovskite ferroelectric materials are an important class of functional materials. Aurivillius first reported a series of bismuth-containing layered perovskite ferroelectrics in 1949, which have the advantages of high Curie temperature and large spontaneous polarization. , has attractive application prospects in non-volatile ferroelectric memory, photocatalysis, and photoelectric conversion, and has attracted extensive attention from material scientists. At present, the number of reported Bi-containing layered perovskite compounds has exceeded 50, and more than half of them are ferroelectric. Among them, Bi 4 Ti 3 o 12 It is a typical bismuth-based layered perovskite material, which consists of three pseudopero...

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Problems solved by technology

At present, there have been reports on the preparation of Bi by sol-gel method. 4 Ti 3 o 12 -LaFeO 3 Research reports on the sintering of this ceramic by thin film and solid state reaction method, however, Bi 4 Ti 3 o 12 -LaFeO 3 The preparation process of single crystal nanosheets is relatively complicated, and the synthesis conditions are relatively harsh, which is not suitable for industrial scale production. Moreover, the materials prepared by existing synthesis methods have large scale and irregular morphology, which affect their photoelectrochemical properties.

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