Method for preparing alpha type ferric oxide film
A ferric oxide and thin film technology, which is used in the field of α-Fe2O3 thin film preparation, can solve the problems of poor process repeatability and long cycle (it often takes tens of hours to several days), and achieves easy operation, short cycle, Simple to use effects
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Embodiment 1
[0028] 1) Ultrasonic wash the substrate slide with dilute nitric acid and ethanol for 30 minutes, rinse with distilled water, dry naturally, and set aside;
[0029] 2) FeCl 2 4H 2 The O solid is dissolved in 100ml of water to obtain FeCl with a molar concentration of Fe(II) of 0.05mol / L 2 aqueous solution;
[0030] 3) To FeCl 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid, adjusting the Fe(II) and F atomic ratio in the solution to be 1:3;
[0031] 4) Slowly add ammonia water with a mass concentration of 25% to the mixed solution in step 3), and adjust the pH value of the solution to 5.6;
[0032] 5) Put the pretreated glass slide in step 1) vertically into step 4) to obtain the solution, then place the reaction vessel in a water bath at 60° C. and stir for reaction for 3 hours;
[0033] 6) Take out the glass slide covered with film, put it into distilled water and ultrasonically wash three times, after each 3 minutes, dry naturally at room te...
Embodiment 2
[0037] 1) with embodiment 1 step 1);
[0038] 2) FeCl 2 4H 2 The O solid is dissolved in 100ml of water to obtain FeCl with a molar concentration of Fe(II) of 0.1mol / L 2 aqueous solution;
[0039] 3) To FeCl 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid to adjust the Fe(II) and F atomic ratio in the solution to be 1:1;
[0040] 4) Slowly add ammonia water with a mass concentration of 25% to the mixed solution in step 3), and adjust the pH value of the solution to 5.4;
[0041] 5) with embodiment 1 step 5);
[0042] 6) with embodiment 1 step 6);
[0043] 7) Same as step 7) of Example 1.
[0044] From image 3 It can be seen that α-Fe 2 o 3 The film is composed of irregular particles with a particle size of 0.6-1 μm. The connection between the particles is tight but the surface of the film is uneven. From Figure 4 It can be seen that the thickness of the film is about 800 nm. It is proved by X-ray diffraction that the film obtained befo...
Embodiment 3
[0046] 1) with embodiment 1 step 1);
[0047] 2) with embodiment 1 step 2);
[0048] 3) To FeCl 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid, adjusting the Fe(II) and F atomic ratio in the solution to be 1:6;
[0049] 4) with embodiment 1 step 4);
[0050] 5) Put the slide glass pretreated in step 1) vertically into step 4) to obtain the solution, then place the reaction vessel in a water bath at 80° C. and stir for reaction for 3 hours;
[0051] 6) with embodiment 1 step 6);
[0052] 7) Same as step 7) of Example 1.
[0053] Scanning electron microscopy showed that the film was composed of irregular particles with a particle size of 0.5-0.8 μm, the connection between particles was tight, and the surface of the film was smooth. The thickness of the film is about 700 nm. It is proved by X-ray diffraction that the film obtained before calcination is β-FeOOH crystal form, and the film obtained after calcination is α-FeOOH crystal form. 2 o ...
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