Hamline News

Dong Published in Computational Physics

Lifeng Dong, professor and the Emma K. and Carl R. N. Malmstrom Endowed Chair in Physics, has co-authored a scientific article, “Theoretical Study on the Optical and Electronic Properties of Graphene Quantum Dots Doped with Heteroatoms,” published in Physical Chemistry Chemical Physics. Due to intensive quantum confinement and edge effects, graphene quantum dots exhibit extraordinary properties such as low toxicity, high biocompatibility, good photostability and solubility, which make them interesting candidates for electronic device applications. In this collaborative project with researchers at Qingdao University of Science and Technology in China, the effects of four heteroatoms (Boron, Nitrogen, Phosphorus, and Sulfur) with three doping patterns on optical and electronic properties of graphene quantum dots are systematically investigated using time-dependent density functional theory. Computational results indicate that large radius atoms assist charge transfer in the excited state and play an important role in recombining the electron density distribution in the doped graphene quantum dots.

Dong currently works with his collaborators and undergraduate students to design, synthesize, fabricate, and characterize nanoscale materials and devices such as solar cells, fuel cells, supercapacitors, and lithium batteries. They are used for energy conversion and storage as well as water purification and desalination. More information can be found at the website of the Hamline University Renewable Energy and Environmental Research (REER) Laboratory.