Method of symmetrically growing spiral carbon tube
A technology of carbon tubes and spirals, applied in the field of symmetrical growth of nano-helical carbon tubes and their preparation, can solve problems such as complex conditions and difficult control, and achieve the effects of simple preparation process, narrow particle size distribution, and unique catalytic activity
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Embodiment 1
[0022] Example 1: under strong stirring, 0.03mol FeCl 2 4H 2 O and 0.045mol citric acid were dissolved in 100mL of absolute ethanol, and stirred continuously at 60°C for 6 hours to form a uniform transparent sol; evaporated and dried at 80°C until a xerogel was formed; the xerogel was pre-baked at 450°C in air for 3 hours, and then An appropriate amount of this oxide is placed in a tube furnace and placed in a hydrogen atmosphere in the tube furnace for reduction at 450° C. for 4 hours. Then turn off the hydrogen, immediately introduce acetylene gas, keep warm at 450°C for 6 hours, and then cool to room temperature. The obtained carbon tube electron microscope observation results are shown in Figure 1, the field emission scanning electron microscope observation results are shown in Figure 2 and the XRD results are shown in Figure 3. The same molar amount of oxalic acid is also acceptable. Acetylene was maintained at 150 Pa in the growth chamber. The growth is highly symmetr...
Embodiment 2
[0023] Example 2: under strong stirring, 0.03mol FeCl 2 4H 2 O and 0.045mol citric acid were dissolved in 100mL of absolute ethanol, and stirred continuously at 60°C for 6 hours to form a uniform transparent sol; evaporated and dried at 80°C until a xerogel was formed; the xerogel was pre-baked at 450°C in air for 3 hours, and then Take an appropriate amount of this oxide and place it in a tube furnace in a hydrogen atmosphere at 450°C for 4 hours for reduction. Then turn off the hydrogen, immediately introduce acetylene, keep warm at 450°C for 6 hours, then cool to room temperature, and then quickly heat up to 750°C, then turn off the acetylene, immediately introduce argon, keep at 750°C for 4 hours, and then cool to room temperature. The obtained XRD results are shown in FIG. 4 .
Embodiment 3
[0024] Example 3: The experimental process and conditions are the same as in Example 1, but the amount of catalyst is 3 times that of Example 1. The obtained carbon tube scanning electron microscope observation results are shown in Figure 5. It is also possible to reduce the temperature at 600 ° C for 3 hours, and the acetylene is maintained at 100 Pa.
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