Apparatus for manufacturing nano-size graphene-structured material
There is provided an apparatus for preparing a graphene-structured material. The apparatus includes a supply hopper configured to supply graphite oxide; a supply line of which an end is connected to a lower end of the supply hopper; a reducing atmosphere gas supply unit connected to a side of the supply line; a vertical fluidized bed furnace of which a lower part is connected to another end of the supply line and configured to reduce the supplied graphite oxide with thermal-expansion; a discharge line of which an end is connected to an upper part of the vertical fluidized bed furnace; a vibrating type vertical micro filter connected to an opening portion on a side of the discharge line; a vacuum pump connected to the vertical micro filter; and a collector positioned under the vertical micro filter and connected to another end of the discharge line.
1. An apparatus for preparing a graphene-structured material, the apparatus comprising:
a supply hopper configured to supply graphite oxide;
a supply line of which an end is connected to a lower end of the supply hopper;
a reducing atmosphere gas supply unit connected to a side of the supply line;
a vertical fluidized bed furnace of which a lower part is connected to another end of the supply line and configured to reduce the supplied graphite oxide with thermal-expansion;
a discharge line of which an end is connected to an upper part of the vertical fluidized bed furnace;
a vertical micro filter connected to an opening portion on a side of the discharge line;
a vibrator and a vacuum pump connected to the vertical micro filter; and
a collector positioned under the vertical micro filter and connected to another end of the discharge line,
wherein the graphene-structured material is discharged through the discharge line from the vertical fluidized bed furnace, collected at the vertical micro filter, and dropped into the collector from a vibration on the vertical micro filter created by the vibrator.
2. The apparatus of claim 1 , wherein the graphite oxide is oxidized under ultrasonication and has a carbon/oxygen ratio of from about 1/1 to about 5/1 as an analysis result of an elemental analyzer and a maximum peak in 2θ of from about 12° to about 14° according to an XRD analysis, and
the graphene-structured material is a mixture of single-layered graphene and multiple-layered graphene and includes exfoliated graphite having an average surface area ranging from about 200 m 2 /g to about 2600 m 2 /g.
3. The apparatus of claim 1 , wherein a temperature within the vertical fluidized bed furnace is maintained in a range of from about 500° C. to about 1200° C.
4. The apparatus of claim 1 , wherein the atmosphere gas supply unit supplies an inert carrier gas including nitrogen or argon.
5. The apparatus of claim 1 , wherein the atmosphere gas supply unit supplies an inert carrier gas and a reducing gas.
6. The apparatus of claim 5 , wherein the reducing gas includes a hydrogen gas, a methane gas, carbon monoxide or alcohol.
7. The apparatus of claim 5 , wherein the atmosphere gas supply unit comprises a valve configured to adjust an amount of the inert carrier gas and reducing gas to be supplied to the supply line.
8. The apparatus of claim 1 , wherein the vertical fluidized bed furnace is provided in a height direction to continuously apply a thermal shock to the graphite oxide vertically rising in the vertical fluidized bed furnace.
9. The apparatus of claim 1 , wherein the discharge line is horizontally connected to the vertical micro filter.