Preparation method and application of gallium oxide (Ga2O3)

Overview of Gallium Oxide Ga2O3

Gallium oxide is an inorganic compound with the chemical formula Ga2O3. Also known as gallium trioxide, it is a wide-bandgap semiconductor with Eg=4.9eV. Its conductivity and light-emitting characteristics have long attracted people's attention. Ga2O3 is a transparent oxide semiconductor material with broad application prospects in optoelectronic devices. It is used as an insulating layer for Ga-based semiconductor materials and as an ultraviolet filter. It can also be used as an O2 chemical detector.

Gallium (III) oxide, namely gallium trioxide, is the most stable of gallium oxides. Heating metal gallium in the air to oxidize it, or calcining gallium nitrate, gallium hydroxide and some gallium compounds at 200-250°C can form Ga2O3.

Ga2O3 has five isomers: α, β, γ, δ, ε, the most stable of which is β-isomer, when heated to above 1000°C or hydrothermal conditions (ie wet method) to 300°C In the above, all other isomers are converted to β-isomers. Various pure isomers can be prepared by different methods.

Alpha-Ga2O3 can be obtained by heating metal gallium in air to 420～440℃; calcining nitrate to decompose it or heating gallium hydroxide to 500℃.

Preparation method of gallium oxide Ga2O3

1. Add a highly concentrated hot aqueous solution of NaHCO3 to the hot aqueous solution of gallium trichloride and GaCl3, and boil until all the gallium hydroxides are precipitated. Wash the precipitate with hot water until there is no Cl-, and calcinate above 600°C to obtain β-Ga2O3. When NH4Cl remains, it will react with Ga2O3 at 250°C to generate volatile GaCl3.

2. This is the production method of high purity Ga2O3. Take high-purity metal Ga as the anode, dissolve it in a 5%-20% H2SO4 solution, add ammonia to the solution, cool, and repeatedly crystallize Ga(NH4)(SO4)2, dry it at 105°C, and under the condition of excess oxygen Burning at 800°C for 2h, a product with a purity of 99.99% to 99.9999% is obtained.

3. Weigh 1kg of 99.9999% high-purity gallium into a three-necked flask, add high-purity nitric acid to dissolve the gallium, then filter, pour the filtrate into a three-necked flask, and transfer to the electric furnace to evaporate (in a fume hood When it is concentrated to close to crystallization, transfer the solution to a large evaporating dish and evaporate to dryness. Put the evaporated Ga(NO3)3 in a muffle furnace for burning, the temperature is controlled at 550℃, burning for 5h, after cooling, take out the finished product, get 1.2kg of high-purity gallium oxide

Gallium oxide Ga2O3 application

Gallium oxide Ga2O3 is used as a high-purity analytical reagent and used to prepare semiconductor materials in the electronics industry.

Gallium oxide has been used in the research of lasers, phosphors and luminescent materials. Gallium oxide is also used as a tightly connected insulating layer.

Monoclinic β-Ga2O3 is mainly used for gas sensors and luminescent phosphors, and can also be used for dielectric coatings of solar cells.

Semiconductor; gas sensing; in the field of catalysis, gallium oxide is also used.

The application of gallium oxide nanostructures as blue and ultraviolet light emitters in optoelectronic devices.

This stable oxide also shows the potential for deep ultraviolet transparent conductive oxide and transistor applications.

Gallium oxide Ga2O3 film has important commercial value as a gas-sensitive material.

Ss-gallium (III) oxide is used to produce Ga2O3-Al2O3 catalyst.

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