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A method for preparing α-iron oxide film by liquid phase transport
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A technology of iron oxide and thin film, applied in the direction of coating, etc., can solve the problem of blank α-iron oxide thin film, and achieve the effect of controllable thickness, short process and wide sources
Inactive Publication Date: 2020-12-01
XUCHANG UNIV
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The technology of directly preparing α-iron oxide thin films using solid iron-containing compounds as raw materials is still blank
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Embodiment 1
[0036] Example 1, see Figure 1-4 , 10:
[0037] The invention provides a method for preparing an α-iron oxide film by liquid phase transport, comprising the following steps:
[0038] 1) dissolving oxalic acid and sodium nitrate in distilled water to form a mixed solution with an oxalic acid concentration of 0.05 mol / L and a sodium nitrate concentration of 3.0 mol / L, and adjusting the pH of the mixed solution to 2 with oxalic acid;
[0039] 2) Pour the mixed solution of step 1) into the lining of the autoclave, and fill it with 20mL;
[0040] 3) Add 3.0mmol α-Fe to the lining of the autoclave 2 o 3 powder;
[0041] 4) Wash the FTO conductive glass substrate sequentially with ethanol, distilled water, hydrogen peroxide-ammonia-water, and distilled water for 5-10 minutes respectively, dry it naturally in the air, and then put it vertically or horizontally into the mixed solution lined with the autoclave. Sealed autoclave;
[0042]5) Place the autoclave in an oven at 155°C ...
Embodiment 2
[0045] Example 2, see Figure 1-2 :
[0046] The present invention provides a method for preparing α-iron oxide film by liquid phase transport, the specific process is basically the same as in Example 1, the difference is that the concentration of sodium nitrate is 1.0mol / L, α-Fe 2 o 3 The powder was added in an amount of 1.0 mmol.
[0047] Such as figure 1 As shown in sample 2, when the concentration of sodium nitrate reaches this concentration, the α-iron oxide film on the FTO substrate is relatively uniform and dense. figure 2 The Raman scattering of sample 2 proves that the deposited film is α-iron oxide.
Embodiment 3
[0048] Example 3, see Figure 1-2 :
[0049] The present invention provides a method for preparing α-iron oxide film by liquid phase transport, the specific process is basically the same as that of Example 1, the difference is that the concentration of sodium nitrate is 0.75 mol / L.
[0050] Such as figure 1 As shown in sample 3, the concentration of sodium nitrate can lead to the preferential growth of films on FTO, due to the limitation of mass transfer, the partial area is not uniform enough. figure 2 The Raman scattering of sample 3 indicated that the as-prepared film was α-iron oxide.
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Abstract
The invention provides a method for preparing an alpha-iron oxide film by liquid phase transmission. The method comprises the following steps of: dissolving oxalic acid or oxalate and nitrate in distilled water to prepare a mixed solution, and adjusting the pH of the mixed solution to 1-3; pouring the mixed solution into a lining of an autoclave; adding solid iron-containing compound powder into the lining of the autoclave; putting a cleaned conductive glass substrate into the mixed solution in the lining of the autoclave, and sealing the autoclave; putting the autoclave into an oven for reaction, and naturally cooling the autoclave; taking out the conductive glass substrate deposited with an alpha-iron oxide film, washing the conductive glass substrate with distilled water, and carrying out natural drying to obtain the alpha-iron oxide film. The method provided by the invention can avoid the use of a high-purity soluble iron salt precursor, is simple and convenient, is convenient to operate, can be used for preparing optoelectronic films, and can recycle iron-containing solid wastes.
Description
technical field [0001] The invention relates to the technical field of manufacturing inorganic non-metallic materials, in particular to a method for preparing α-iron oxide thin films by liquid phase transmission. Background technique [0002] With the rapid development of society, the shortage of energy is becoming more and more serious, and the environmental pollution is becoming more and more serious, which leads to the difficulty of sustainable development and the self-repair of the earth. Corrosion of iron and steel causing heavy losses is a problem that has plagued countries for a long time. At the same time, a large amount of solid waste rusts. In order to achieve sustainable development, it is necessary to develop new renewable and clean energy, and to recycle various wastes and pollutants to realize the recycling of resources. Photoelectrochemical technology uses sunlight to split water on the semiconductor surface to produce hydrogen or reduce carbon dioxide to dir...
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