I have 20 ml water solvent containing graphene quantum dots and sodium salts. How do I prepare GQDs powder so it’s preserve the crystalline nature? I dried it in 100 C temperature but XRD spectrum show non-crystalline GQDs.
First，dialysis; Then, freeze to block; Finally,freeze drying under -50℃.
Thank Tong-Tong. what is suitable time and temperature to freezing in first step? and second step?
I have faced the same problem with my sample. Simple evaporation of your sample will not help as precipitation of your sodium salts will also take place, which will be taken together for your future characterizations. Dialysis is thus required and is essential. I have a crude idea and am not sure if it will work out or not, and I am yet to try this on my sample. First,, you can filter off your sample against a 0.5 kDa cut off membrane (dialyzed against pure water), and then evaporate it until dry at room temperature for several days. You can then rinse it in ethanol for several minutes before re-dissolving in water, and then drying it at room temperature, again.
Ayuob Aghaei , Can you please send the procedure/PAPER with which you can prepare GQD ?
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