The size obtained from TEM of Carbon Dots are the size of carbon core alone or it includes the length of surface functionalization too?
The size obtained from TEM of Carbon Dots includes the length of surface functionalization. XRD - not includes.
Dear Yuri Mirgorod,
Thank you. I have a fundamental doubt may be it is a silly question. I hope with TEM and HRTEM one can not view the molecules. In carbon dots, the core is a dense part so one can view it through TEM while the functional groups are just projecting outside of the carbon core which will have the length of few angstroms logically. So how the size obtained from TEM representing the functionalized region too? Moreover, in a publication (Jin et al., ACS Nano, 2013, 7, 1239), the authors have prepared GQDs and functionalized it with PEG. They claimed that there is no change in the size obtained from TEM for bare GQDs and PEG passivated GQDs.
If you explain more precisely on fundamental aspects it will be highly helpful to me.
TEM / HRTEM comparises complete size of carbon dots. Surface funtionalizations are not visible in visual analysis. Further more for surface area details you can do BET surface area measurements before and after funtionalizations, if there is any doubt on this issue. As in case of GO and rGO there is minor but accountable difference in BET surface area, as former is funtionalized and later is nonfuntionalized.
Hope this answer will help you. Thanks
I would like to add more in my above answer, particle size and surface area are different issues, if we will consider surface funtionalizations of matrix then we have to discuss surface area, but if we are only talking about size of matrix then funtionalizations and surface area are not included in discussion, in such case TEM analysis is enough to know and believe the size.
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