i want to megnetize RGO by the formation of fe3o4, But I did not succeed in doing this.
good and interesting question,
make you question clear: how do you imagine the structure? blended? chemically binded to GO?
did you attempt to synthesize Fe3O4 in pretense on GO (with high content of oxygen such as -OH, -COOH etc.)
I mixed two and three valence of iron chlorides with a molar ratio of 1 to 2 in a reactor and placed it under nitrogen gas with stirring and heated it over 80 degrees. After one hour, the reduced graphene (with ascorbic acid) was added to the solution, and then the sodium borohydride was added slowly to the solution, followed by ammonia, and immediately after the addition of ammonia, the gas flow was turned off and allowed to the solution agitated for 1-2 hours at the temperature of 80 degrees. Then turn off the stirrer and heat and place the solution alongside an external magnet. it must be magnetic. But it will not be.
Maybe a stupid question, Samaneh, but I have to ask: Have you tried to do the reduction the same way, but without the graphene oxide? The result should be the same in terms of the iron-containing products. It is possible that the reduction goes too far, to Fe(OH)2. Powder XRD will tell.
If you do form magnetite (confirm by powder XRD again), it is still possible that you will get almost or no magnetization, if the particles are extremely small. If the recipe you are following is for nanoparticles, you may be close to the minimum size where magnetization can occur.
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