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Articles

Graphene quantum dots by a bottom-up synthesis.

graphene quantum dots bottom-up synthesisFew years ago was it shown that colloidal graphene doped with nitrogen can behave as a quantum dot – i.e. absorb light at one wavelength and emit it at another, longer wavelength. Such graphene particles were synthesized exclusively be top-down approach from massive graphite using oxidation, exfoliation and reduction procedures. The major drawback of such approach is that an undefined mixture of all possible molecules and structures is produced at the end, each of them having its own properties.

Now, for the first time graphene particles could be synthesized by a bottom-up approach. Scientists from Indiana University in cooperation with Case Western University (USA) have started three 7-step syntheses from benzene derivative ending up with three different graphene molecules, two of which were on purpose doped with nitrogen. To the amusement of the authors, only undoped graphene exhibited fluorescence. The other two had a potent electrocatalytic activity.

 

This work opens new avenues for the tailored controlled synthesis of colloidal graphenes boosting the research activities ending up in a better fundamental understanding of graphenes and in new applications from catalysis through lightning to microelectronics.

Image published with the permission of American Chemical Society
 
2012-11-07 NanoJam (c) 2012
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