Preparation method of green graphene nanosheet
A graphene nanosheet, graphene technology, applied in the field of carbon nanomaterials, can solve problems such as high cost, complex preparation process, environmental pollution and the like
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[0021] The invention provides a kind of preparation method of green graphene nanoplate, comprises the following steps:
[0022] mixing graphite, urea peroxide and hydrogen peroxide to obtain a mixture;
[0023] After the mixture is subjected to standing and microwave treatment successively, graphene aggregates are obtained;
[0024] The graphene aggregates are ultrasonically dispersed in ethanol to obtain graphene nanosheets.
[0025] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.
[0026] For the present invention graphite, urea peroxide and hydrogen peroxide are mixed to obtain a mixture.
[0027] In the present invention, the particle size of the graphite is preferably 50-5000 mesh; the graphite is preferably natural flake graphite. In the present invention, the dosage ratio of the graphite, urea peroxide and hydrogen peroxide is preferably 0.1-0.5g: 0.05-0.1g: 5-10mL, more pref...
Embodiment 1
[0037] Add 0.1g of 50 mesh natural flake graphite and 0.05g of urea peroxide into 5mL of hydrogen peroxide (concentration is 30%) and mix uniformly to obtain a mixture;
[0038] After the obtained mixture was left to stand at room temperature for 12 hours, microwave treatment was carried out once at a microwave power of 500w, and after 60s, graphene aggregates were obtained;
[0039] The obtained graphene aggregates were ultrasonicated in ethanol for 20 min with an ultrasonic power of 70 W to obtain graphene nanosheets.
[0040] The electrical conductivity of the prepared graphene nanosheets is tested, and the test method is:
[0041] Weigh 0.2g of graphene nanosheets, uniformly disperse in 50mL ethanol, carry out suction filtration with PES filter membrane (pore size 0.22μm, diameter 47mm), after the solid product obtained by suction filtration is dried at room temperature, it is pressed into a 2 μm thick film.
[0042] The electrical conductivity of the obtained film was t...
Embodiment 2
[0047] The difference between this example and Example 1 is that 0.2g of 50 mesh natural flake graphite and 0.05g of urea peroxide were added to 7mL (concentration of 30%) hydrogen peroxide and mixed uniformly to obtain a mixture.
[0048] After the obtained mixture was left standing at room temperature for 12 hours, microwave treatment was performed twice under the condition of microwave power of 500w, each time for 60s, to obtain graphene aggregates.
[0049] The electrical conductivity of the prepared graphene nanosheets was tested, the test method was the same as in Example 1, and the test results are shown in Table 1.
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