Preparation method of graphene nano fibers or nanotubes
A technology of nanofibers and nanotubes, which is applied in the field of assembly of graphene nanosheets, and can solve problems such as preparing graphene nanofibers
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Embodiment 1
[0021] This embodiment includes the following steps:
[0022] Step 1. Using natural graphite flakes as raw material, graphene oxide was obtained by chemical method, and then 0.24 g of graphene oxide was dissolved in 8.8 g of DMF and subjected to ultrasonic treatment for 2 hours to obtain a graphene oxide (GO) dispersion. figure 1 is the microscopic characterization diagram of GO.
[0023] Step 2, preparation of electrospinning solution. 0.96 g of PAN was added to the above mixed solution, heated and stirred in a water bath at 65° C. for 24 hours, and a 12% electrospinning solution could be formed. The mass fraction of the graphene oxide in the solute is 20%.
[0024] Step 3: Electrospinning the obtained solution to realize the preparation of nanofiber composite precursors. During the electrospinning process, the voltage is 25kv, the distance between the needle and the substrate is 25cm, and the solution feeding rate is 1ml / h.
[0025] Step 4: Pre-oxidize the prepared compos...
Embodiment 2
[0027] This embodiment includes the following steps:
[0028] Step 1. Using natural graphite as raw material, obtain graphene oxide by chemical method, then dissolve 0.12g graphene oxide in 3.9g water and perform ultrasonic treatment for 2 hours to obtain GO, and then ultrasonically disperse to obtain graphene oxide (GO) dispersion.
[0029] Step 2, preparation of electrospinning solution. Finally, 0.22 g of PVA was added to the above dispersion liquid, heated and stirred in a water bath at 65° C. for 24 hours, and an 8% electrospinning solution could be formed. Wherein the mass fraction of graphene oxide accounts for solute is 35%.
[0030] Step 3: Electrospinning the obtained solution to realize the preparation of nanofiber composite precursors. During the electrospinning process, the voltage is 25kv, the distance between the needle and the substrate is 25cm, and the solution feeding rate is 1ml / h.
[0031] Step 4: Carry out carbonization and NH to the prepared composite n...
Embodiment 3
[0033] This embodiment includes the following steps:
[0034] Step 1. Using natural microcrystalline graphite as a raw material, graphene oxide is obtained by chemical method, and then 0.3 g of graphene oxide is dissolved in 9 g of DMF and subjected to ultrasonic treatment for 2 hours to obtain a graphene oxide (GO) dispersion.
[0035] Step 2, preparation of electrospinning solution. 0.7 g of PAN was added to the above dispersion, heated and stirred in a water bath at 65° C. for 24 hours, and a 10% electrospinning solution could be formed.
[0036] Step 3: Electrospinning the obtained solution to realize the preparation of nanofiber precursors. During the electrospinning process, the voltage is 25kv, the distance between the needle and the substrate is 25cm, and the solution feeding rate is 1ml / h.
[0037] Step 4: Pre-oxidize the prepared composite nanofiber precursor at a temperature of 280° C. for 1 hour. Afterwards, the pre-oxidized composite nanofibers were carbonized a...
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