Controllable preparation method of monodisperse nano alpha-phase ferric oxide monocrystal
A ferric oxide, monodisperse technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., to achieve the effects of low preparation cost, low energy consumption, and simple equipment
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Embodiment 1
[0029] Example 1: Add 400 ml of ferric chloride aqueous solution with a mass ratio of 0.8% to a 500 ml round bottom flask, heat the ferric chloride aqueous solution with an oil bath at 80°C, and keep it warm for 0.5 h; then, add 2 ml of ferric chloride under stirring conditions With 80% hydrazine hydrate aqueous solution, the oil bath was heated to 105°C at a rate of 5°C / min and refluxed for 6 h; the obtained brick red precipitate was collected and dried at 80°C for 6 h. Scanning electron microscope observation found that the prepared α-phase ferric oxide was spindle-shaped, with a main size of 300 nm × 90 nm, presenting a monodisperse state (see figure 2 ); the morphology observed by the transmission electron microscope is consistent with that of the scanning electron microscope, and the selected electron diffraction of a single nanomaterial confirms that the material is a single crystal.
Embodiment 2
[0030] Example 2: Add 800 ml of ferric chloride aqueous solution with a mass ratio of 4% to a 1000 ml round bottom flask, heat the ferric chloride aqueous solution with an oil bath at 80°C, and keep it warm for 2 h; then, add 18 ml of ferric chloride under stirring conditions With 80% hydrazine hydrate aqueous solution, the oil bath was heated to 105°C at a rate of 5°C / min and refluxed for 6 h; the obtained brick red precipitate was collected and dried at 80°C for 6 h. Observation by scanning electron microscopy revealed that the prepared α-phase ferric oxide was ellipsoidal, with a main size of 200 nm×120 nm, presenting a monodisperse state (see image 3 ).
Embodiment 3
[0031] Example 3: Add 4000 ml of ferric chloride aqueous solution with a mass ratio of 8% to a 5000 ml round bottom flask, heat the ferric chloride aqueous solution with an oil bath at 80°C, and keep it warm for 2 h; subsequently, add 168 ml of ferric chloride under stirring conditions With 80% hydrazine hydrate aqueous solution, the oil bath was heated to 105°C at a rate of 5°C / min and refluxed for 6 h; the obtained brick red precipitate was collected and dried at 80°C for 6 h. Scanning electron microscope observation found that the prepared α-phase ferric oxide was ellipsoidal, with a main size of 100 nm×100 nm, showing a monodisperse state (see Figure 4 ).
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