News Column

Investigators from Massachusetts Institute of Technology Have Reported New Data on Quantum Dots

June 13, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Quantum Dots. According to news reporting originating from Cambridge, Massachusetts, by NewsRx correspondents, research stated, "This paper reports a facile fabrication of N-doped graphene quantum dots (N-GQDs) showing controllable chemical properties through a hydrothermal treatment. The N-GQDs have a uniform size of 3.06 +/- 0.78 nm and prefer the equilibrium shapes of circle and ellipse due to the minimization of edge free energy."

Our news editors obtained a quote from the research from the Massachusetts Institute of Technology, "The N/C atomic ratio in N-GQDs can be precisely tailored in a range from 8.3 at% to 15.8 at% by simply controlling the concentration of N source (ammonium hydroxide). One order of magnitude quantum yield of 34.5% is achieved by N-GQDs, compared with the N-free GQDs, as the substitutional N has an essential role in more effective radiative emission. Excessive N dopants in N-GQDs can lead to photoluminescence quenching, through nonradiative transition back to the ground state. The N-GQDs are further found to be suitable as photocurrent conversion materials due to benign energy matching with anatase nanofibers, the ultrafast electron injection at their interface, and efficient electron transfer."

According to the news editors, the research concluded: "This work provides an efficient and inspiring approach to engineering both chemical components and physical properties of N-GQDs, and will therefore promote their basic research and applications in energy conversion."

For more information on this research see: Versatile Graphene Quantum Dots with Tunable Nitrogen Doping. Particle & Particle Systems Characterization, 2014;31(5):597-604. Particle & Particle Systems Characterization can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell -; Particle & Particle Systems Characterization -

The news editors report that additional information may be obtained by contacting Y.Q. Dai, MIT, Elect Res Lab, Center Exciton, Cambridge, MA 02139, United States. Additional authors for this research include H. Long, X.T. Wang, Y.M. Wang, Q. Gu, W. Jiang, Y.C. Wang, C.C. Li, T.H. Zeng, Y.M. Sun and J. Zeng (see also Quantum Dots).

Keywords for this news article include: Nitrogen, Cambridge, Quantum Dots, Massachusetts, United States, Nanotechnology, Quantum Physics, Emerging Technologies, North and Central America

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Source: Science Letter

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