I am currently working on making carbon nanodots from different carbon sources (one of them is PEG 1000). The colour of the sample showed clear change from transparent to brown, same as the UV absorbance showed increase in the range of 200 to 400. However, I have some issue with the photoluminescence. The as-prepared bulk solution was not showing any signal. I also placed my sampe under 364 nm UV lamp, which also didnt show any signal. Should I centrifuge the sample and run through dialysis? And what is the reason of doing these? Any hints would be hugely appreciated.
Dear Xuan,
I am attaching a recent article explaining the photoluminescence mechanism in carbon nanodots. This may be helpful to you.
Good luck
Yours,
Suresh Sharma
Dear Suresh
thank you very much for your reply. I have actually seen this paper before. What I do wants to find out is that when checking the PL, is that important to throughly wash the sample, adjust the concentration or use specific reagent to well disperse the sample. I have seen people have been using dialysis or high speed centrifugation to remove small fragments or big bulks after their reaction. The reason of doing that is to get a uniform size distribution. But I don't really know if this step is crucial or not. For example, For an as-prepared sample (without any further dialysis), if it's not showing fluorescence, does that mean the sample is not fluorescent? Or it's hard to tell before we do dialysis or removing the bigger particles. Hope it clarifies my question.
Thanks
xuan
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