A kind of carbon nanotube and preparation method thereof
A carbon nanotube and metal nanoparticle technology, which is applied in the preparation and application of carbon nanotubes, can solve the problems of uncontrollable carbon nanotube morphology, achieve the effects of improving electrochemical performance, changing electronic structure, and simple preparation process
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Embodiment 1
[0033] At 20°C, 1.436 g of cobalt nitrate hexahydrate and 3.244 g of 2-methylimidazole were dissolved in 100 ml of methanol respectively. The former was slowly added to the latter under stirring, and the stirring was continued for 12 min, and then allowed to stand for 20 h. Centrifuged, washed three times, and vacuum-dried at 150 °C for 8 h to obtain ZIF-67-300. Dissolve 2g of dicyandiamide and 1g of cobalt acetate in 60ml of ethanol, heat and stir at 80°C for 5h, then add 0.2g of ZIF-67-300, stir at room temperature for 48h, and evaporate to dryness at 60°C to obtain solid powder. The solid powder was taken and placed in a corundum boat, heated to 800°C at a heating rate of 2°C / min under nitrogen protection and kept for 1 h, and then cooled to room temperature at a cooling rate of 5°C / min to take out the carbon nanotubes.
[0034] Using 300nm ZIF-67 as template, carbon nanotubes with an outer diameter of about 200nm were prepared.
Embodiment 2
[0036] At 20°C, 1.436 g of cobalt nitrate hexahydrate and 3.244 g of 2-methylimidazole were dissolved in 200 ml of methanol respectively. The former was slowly added to the latter under stirring, and the stirring was continued for 12 min, and then allowed to stand for 20 h. Centrifuged, washed three times, and vacuum-dried at 150 °C for 8 h to obtain ZIF-67-150. Dissolve 2g of dicyandiamide and 1g of cobalt acetate in 60ml of ethanol, heat and stir at 80°C for 5h, then add 0.2g of ZIF-67-150, stir at room temperature for 48h, and evaporate to dryness at 60°C to obtain solid powder. The solid powder was taken and placed in a corundum boat, heated to 800°C at a heating rate of 2°C / min under nitrogen protection and kept for 1 h, and then cooled to room temperature at a cooling rate of 5°C / min to take out the carbon nanotubes.
[0037] Using 150nm ZIF-67 as template, carbon nanotubes with an outer diameter of about 100nm were prepared.
Embodiment 3
[0039] At 20°C, 1.470g of zinc nitrate hexahydrate and 3.260g of 2-methylimidazole were dissolved in 50ml of methanol respectively. The former was slowly added to the latter under stirring, and the stirring was continued for 12min, and then allowed to stand for 20h. Centrifuged, washed three times, and vacuum-dried at 150 °C for 8 h to obtain ZIF-8-80. Dissolve 2g of dicyandiamide and 1g of cobalt acetate in 60ml of ethanol, heat and stir at 80°C for 5h, then add 0.2g of ZIF-8-80, stir at room temperature for 48h, and evaporate to dryness at 60°C to obtain solid powder. The solid powder was taken and placed in a corundum boat, heated to 800°C at a heating rate of 2°C / min under nitrogen protection and kept for 1 h, and then cooled to room temperature at a cooling rate of 5°C / min to take out the carbon nanotubes.
[0040] Using 100nm ZIF-8 as a template, carbon nanotubes with an outer diameter of about 50nm were prepared.
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