Thursday, August 6, 2009, 1:30 pm — Small Seminar Room, Bldg. 510
Electron spin resonance (ESR) is an efficient technique to study the density of states (as a function of temperature and doping) of graphene, and to detect magnetic interaction of localized spins at the edges of graphene flakes and ribbons. We have performed ESR measurements in the 4-300 K temperature range on graphene samples derived from: 1) chemical reduction of graphene oxide sheets, 2) liquid phase exfoliation of graphite (LPEG), 3) and mechanical exfoliation. The ESR signal depends very much on the method of preparation of graphene. The amount of localized spins and the Pauli component of the spin susceptibility vary from sample to sample. In some cases ferromagnetism is observed below 20 K.
Acknowledgment: The work is performed in collaboration with L. Ciric, A. Sienkiewicz, A. Olariu, A. Magrez , R. Nesper, J. Coleman and K. Kern. The project is partially supported by MaNEP and by the European Network IMPRESS.
Hosted by: Tony Valla
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