Researchers from Griffith University and the University of Queensland in Australia wrote “Structural evolution of graphene quantum dots during thermal decomposition of citric acid and the corresponding photoluminescence” for the February 2015 issue of Carbon. In the paper, the scientists used Spectra/Por® dialysis membranes to dialyze a dispersion of thermally decomposed citric acid.

Graphene quantum dots (GQDs) have been studied extensively for their novel properties, including electronic, magnetic, and photoluminescence. These properties show potential for a variety of applications where the GQDs could replace conventional semiconductor quantum dots.

Abstract: The thermally decomposed citric acid (TDCA) possesses either excitation-dependent or excitation-independent fluorescence as well as different quantum yields with varying synthesis conditions (i.e. temperature and reaction duration). These photoluminescent (PL) properties were found to be mainly determined by the quantitative competition between the graphene quantum dots (GQDs, average size in the range 0.7–1 nm) and the large-inhomogeneously-sized particles. Click here to read the article.

 

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doi: 10.1016/j.carbon.2014.10.075