I synthesized GO by hummers method and then reduced with ascorbic acid, but IR shows a strange peak between 3800 and 2828, which in GO shows -OH, but doing drx, it shows the characteristic peak around 26 2theta degrees, so yes I have reduced the GO obtaining rGO but it´s super contaminated , I pressuming that is ammonium sulphate because of the traces of sulfuric acid that could be there despite I washed with destillate water, and after that I adjusted the pH during the reduction process in order to estabilize the process and obtaing better reduction.
DRX shows good results but IR shows that there is contamination.
How should I do in order to clean my sample?
You seem well-equipped. Why not measure the spectrum yourself as nobody has come forward?
You can clean the rGO by simply using distill water and centrifuge it several times. and then dry at 60 degree celsius.
I am attaching few papers for your help.
can you upload the IR ? maybe, addition of sodium boron hydride into an cold GO dispersion can be an alternative?
you can find literature spectra often here: http://sdbs.db.aist.go.jp/sdbs/cgi-bin/cre_index.cgi
spectral database of organic compounds.
Try this site for help.
https://openi.nlm.nih.gov/detailedresult.php?img=PMC3514835_ijn-7-5901f2&req=4
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