Preparation method of fluorphlogopite mica, and application of fluorphlogopite mica in preparation of two-dimensional crystals

Abstract

The invention provides a preparation method of fluorphlogopite mica, and an application of the fluorphlogopite mica in the preparation of two-dimensional crystals. The preparation method of fluorphlogopite mica comprises the following steps: mixing magnesite, montmorillonite and quartz sands, and crushing the obtained mixture by a high-speed mechanical shock mill to form a millimeter-scale fine sand grain mixture; adding a nitric acid solution to the fine sand grain mixture, and carrying out a reaction to obtain a suspension; adding sodium fluoride and potassium chloride to the suspension, performing stirring and reacting, adjusting the pH value of the obtained solution to 7 by using a sodium hydroxide solution, performing centrifuging to obtain a precipitate, calcining the precipitate, and gradually cooling the obtained material to obtain crude fluorphlogopite mica; and stripping the crude fluorphlogopite mica by using supercritical carbon dioxide to obtain slices which are the prepared fluorphlogopite mica. The prepared fluorphlogopite mica has the advantages of low impurity content, good stability and high smoothness; the two-dimensional crystals prepared from the fluorphlogopite mica have a high mobility reaching 1800 cm<2> V<-1>s<-1>; and the photoelectric responsibility at 550 nm reaches up to 2000 AW<-1>.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of fluorophlogopite and its application in the preparation of two-dimensional crystals. Background technique [0002] Natural mica is a kind of natural non-metallic ore in nature. It belongs to silicate. Natural mica contains many kinds of components, the most important components are silicon and aluminum. The silicon content accounts for about 49%, and the aluminum content accounts for about 30%. Its chemical formula is KAl 2 (AlSi 3 o 10 )(OH) 2 and KMg 3 (AlSi 3 o 10 )(OH) 2 , Natural mica has been widely used in the chemical and electrical industries due to its good insulation, high temperature resistance, acid and alkali resistance and other characteristics. However, with the continuous development of science and technology, people found that although natural mica has very good characteristics, it has great limitations in many field...

AI Technical Summary

Problems solved by technology

However, the fluorophlogopite prepared by these methods melts at high temperature and crystallizes after cooling, and the sudden change of cold and heat leads to poor stability and poor flatness of the prepared fluorophlogopite. At the same time, the fluorophlogopite prepared by some methods also has the problem of high impurity content.

[0005] In recent years, fluorophlogopite has been gradually applied to two-dimensional crystals as a matrix. For example, fluorophlogopite is used to grow quantum materials such as high-mobility two-dimensional semiconductors and topological insulators. These materials are mainly used in transparent conductive films and other light-transmitting materials. In the field of electrical components and other fields, the transparency and flatness of the material itself are very high, and the fluorine phlogopite in the prior art cannot meet the requirements for the preparation of high-quality two-dimensional crystal materials.

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