In what respect will it be different from the ones made in water? Apart from sonication of carbon nitride sheets for long hours what are the other easier ways to make quantum dots from sheets?
Dear Nita,
Yes. It is possible to make carbon nitride quantum dots in organic non-polar solvent.
The following publications describe examples for such synthesis (two of the publications are attached):
1- Communication Facile bulk production of highly blue fluorescent graphitic carbon nitride quantum dots and their application as highly selective and sensitive sensors for the detection of mercuric and iodide ions in aqueous media
Sudip Barman*a and Mriganka Sadhukhana
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J. Mater. Chem., 2012,22, 21832-21837
DOI: 10.1039/C2JM35501A
Received 14 Aug 2012, Accepted 04 Sep 2012
First published online 05 Sep 2012
Highly blue fluorescent graphitic carbon nitride quantum dots (g-CNQDs) were synthesized by a simple microwave mediated method from formamide (HCONH2). The fluorescence emission of g-CNQDs is found to be strongly dependent on solvent, pH as well as on excitation wavelengths; the life time of the emission decreases with increasing polarity of the solvent. These quantum dots are highly sensitive and selective florescent probes for mercuric ions in aqueous media due to the “superquenching” of fluorescence. The complex formation of Hg2+ ions with the CNx sheet involving π delocalized electron moieties of the latter, in fact, is responsible for the quenching of fluorescence. The addition of iodide ions abstracts the bound Hg2+ forming HgI2 and gives back the fluorescence characteristic of g-CNQDs. Thus, g-CNQDs can play a dual role for selective and sensitive detection of mercuric ions as well as iodide ions in aqueous media via “ON–OFF–ON” fluorescence response.
Please note, that there is no significant differences between quantum dots prepared in aqueous and organic solvents.
Hoping this will be helpful,
Rafik
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