Tungsten Oxide Liquid Phase Stripping Method

Liquid stripping method is a way to achieve industrial production, but also to produce two-dimensional tungsten oxide composite materials. Stripping the two-dimensional tungsten oxide from the two-dimensional tungsten oxide layer needs to overcome the van der Waals forces between layers, and the tungsten oxide dispersed in the liquid is a direct and effective way to reduce van der Waals forces. This makes the liquid phase separation method has the possibility of industrialization.

Liquid stripping method is usually divided into three steps:

(1) Two-dimensional tungsten oxide is dispersed in a solvent.

(2) assisted by ultrasonic, microwave, shear stress, thermal stress and electrochemical means to help peel.

(3) centrifugal separation of two-dimensional tungsten oxide dispersion. Preparation of two-dimensional tungsten oxide by liquid phase separation method can be divided into two categories, including direct liquid phase separation and auxiliary liquid phase separation. Wherein direct liquid phase stripping is the two-dimensional tungsten oxide being stably dispersed in a solvent by the interaction between the solvent and the two-dimensional tungsten oxide sheet. Auxiliary stripping is the role of additives in the solvent and the sheet, so that two-dimensional tungsten oxide is stably dispersed in the solvent.

Liquid phase separation method can make two-dimensional crystals fully dissolved in the solvent to form a uniform dispersion. These dispersions can then be uniformly deposited on different lamellar materials by a simple method. Liquid stripping method is simple, inexpensive and has good scalability. And its biggest advantage is the same method can be used to build different two-dimensional crystal nanosheets composed of dispersion. These nanosheets show a wide variety of properties. The two-dimensional crystals produced by this method are smaller in size but still exhibit similar properties to two-dimensional sheets obtained by micromechanical delamination. It can form stable and durable inks with definite properties. The inks and heterojunctions obtained by these liquid phase stripping methods are useful to produce sensors and planar light devices for the detection of hydrogen evolution reactions.

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