In my samples TEM images, there are some aggregates of black nanoparticles mostly located on the edges and some of them are on the sheets...I guess they may be a little contaminants or may be amourph carbon nanoparticles....please advise.
Can be nanoparticles trying to attaining spherical shape, which is energitically most favourable for agglomeration.
Thank you Vishal Chaudhary and Khosro Zangeneh Kamali. I have synthesized it through Hummer's method . normally they should become to sheets not particles . I have washed it with 1 M HCl 3 times and then about 15-20 times with DI water. And what happens if I don't wash it properly with HCL? after washing pH reached 5.5-6 and in literatures it is ok to get this pH
Without any image I would suggest that is because some contamination.
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