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Updated: May 23, 2025
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Realization of Near-Room-Temperature Superparamagnetism in Graphene Quantum Dots by High-Concentration Semi-Ionic
Ziying Li1, Shuilin Li2, Jiawei Liu1
1National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China.
Abstract:
Inducing room-temperature superparamagnetism in graphene quantum dots (GQDs), which can afford them various applications in nanoscale spintronic devices and quantum-information devices, remains a challenge due to the difficulty in atomically accurate fabrication of magnetic zigzag edges. Here, we report the realization of superparamagnetism in GQDs by high-concentration semi-ionic fluorine functionalization on the basal plane of GQD sheets. The functionalized GQDs with an average size of about 2.67 nm and a semi-ionic fluorine concentration as high as up to 18.3 atom % exhibit clear superparamagnetism with nearly zero coercivity and remanence magnetization and a near-room-temperature Curie temperature of 275 K. Our findings highlight the effectiveness of semi-ionic fluorine functionalization in inducing superparamagnetism in GQDs.
