Dr. Zheyu Fang, and his research collaborator published their work in ACS Nano about “Plasmon doping of Graphene”. (ACS Nano 2012, 6, 10222) , and Plasmonic tunability of nanostructured graphene (ACS Nano 2013, doi: 10.1021/nn3055835)

In their experiments, the researchers synthesized a monolayer graphene sheet on a copper foil and the transferred it to a silicon wafer with a 285 nm thick oxide layer. They then patterned source and drain electrodes and plasmonic nonamer antennas onto the graphene using electron beam lithography and gold evaporation. Under laser irradiation, the hot electrons generated from plasmon excitation in the gold nonamer antennas are injected into the graphene sheets, resulting in n-type doping.

A particularly interesting concept derived from these finding of efficient photo induced doping of graphene is the possibility of generating what the researchers refer to as optically induced electronics. This work is the follow up of Dr. Fang’s early work “graphene-antenna plasmonic photodetector” Nano Lett. 2012, 12, 3808.

2）Dr. Fang continues his investigations with Prof. García de Abajo (CSIS) on the plasmon resonance of nanostructured graphene layer, by doping the graphene with top gate voltage, they successfully increased the carrier density and Fermi energy of the graphene monolayer. And Finally observed its dipolar resonance in the mid-infrared region. As shown in Fig.2, this work was published on line in ACS Nano ACS doi:10.1021/nn3055835

3）by collaborating with Prof. Jun Lou，P.M.Ajayan，P. Nordlander，N.J.Halas at RICE University, Dr. Fang investigated the catalysts effects for hydrogen evolution with the exfoliated graphitic carbon nitride nanosheets under the visible light, related paper was published on line in Advanced Materials recently. [Adv. Mater. 2013, doi: 10.1002/adma.201204453]。

All of the above works are supported by State Key Lab for Mesoscopic Physics, and school of physics, Peking University.