A kind of method for preparing graphene
A technology of graphene and graphite blocks, which is applied in the field of graphene preparation, can solve the problems of incapable of large-scale production, high equipment requirements, and low product quality, and achieve the effect of simple equipment, low cost, and high conversion rate of raw materials
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Embodiment 1
[0025] Set the volume to 1cm 3 The graphite block was heated to 1000°C at high temperature, then taken out, repeatedly quenched in deionized water for 10 times, dried, mechanically crushed, and the powder was collected after grinding. Take 5 g of quenched graphite carbon powder and add it to a 500 ml agate ball mill jar, use zirconia grinding balls, and carry out dry grinding treatment at a speed of 350 rpm for 3 h; add 4 g of PVP (polyvinylpyrrolidone) into 80 mL of deionized water, Ultrasonic dispersion for 10 min, then the PVP solution was added to the above ball milling system for wet milling at a speed of 450 rpm for 10 h, the obtained suspension was transferred to 20 mL of deionized water, and centrifuged at a speed of 3000 rpm for 20 min to obtain a black colloid in the upper layer The suspension was then dried for 8h to collect graphene powder.
[0026] After testing, the graphene powder Raman spectrum obtained in this implementation case is as follows: figure 1 (S1)...
Embodiment example 2
[0028] Make the volume 2 cm 3 The graphite block was heated to 900 °C at high temperature, then taken out, repeatedly quenched in deionized water for 10 times, dried, mechanically crushed, and powder was collected after grinding. Take 5g of quenched graphite carbon powder and add it to a 250ml zirconia ball mill jar, use zirconia grinding balls, and carry out dry grinding treatment at a speed of 400 rpm for 3 hours; add 5g of PVP (polyvinylpyrrolidone) into 50ml of deionized water, Ultrasonic dispersion for 15 min, and then the PVP solution was added to the above ball milling system for wet milling at a speed of 450 rpm for 8 h, and the obtained suspension was transferred to 25 mL of deionized water, and centrifuged at a speed of 3000 rpm for 20 min to obtain a black colloid in the upper layer The suspension was then dried for 8h to collect graphene powder.
[0029] After testing, the graphene powder Raman spectrum obtained in this implementation case is as follows: figure 1...
Embodiment example 3
[0031] Set the volume to 1cm 3 The graphite block was heated to 1000 °C at high temperature, then taken out, repeatedly quenched in 20wt% ammonia solution for 10 times, dried, mechanically crushed, and the powder was collected after grinding. Take 2g of quenched graphite carbon powder and add it to a 500ml agate ball mill jar, use zirconia grinding balls, and carry out dry grinding treatment at a speed of 350rpm for 3h; add 6g of PVP (polyvinylpyrrolidone) into 50ml of deionized water, and ultrasonically disperse 15min, then the PVP solution was added to the above-mentioned ball milling system to carry out wet milling treatment at a speed of 450rpm for 8h, the resulting suspension was transferred to 30 mL of deionized water, and centrifuged at a speed of 3000rpm for 20min to obtain the upper black colloidal suspension, and then Dry 8h, collect graphene powder.
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