A Near Field EEL Spectroscopy study of surface modes in nanotubes and onions from various layered materials

Ste´phan, O.; Kociak, M.; Henrard, L.; Suenaga, K.; Sandre´, E.; Colliex, C.
November 2000
AIP Conference Proceedings;2000, Vol. 544 Issue 1, p477
Conference Proceeding
We present a Near Field Electron Energy Loss Spectroscopy study of the low-loss energy region (1 to 50 eV), recorded on multishell nanotubes and hyperfullerenes from various layered materials. We concentrate on the study of surface modes excited in a near-field geometry where the coupling distance between the electron beam and the surface of the nano-objects is accurately monitored. Similarities between surface collective excitations in the different layered nanostructures are pointed out. Relying on a classical continuum dielectric model taking fully into account the anisotropic character and the hollow geometry of the nanoparticles, we show that the detected modes are directly related to the in-plane and out-of-plane components of the dielectric tensor of the associated planar bulk material. When the wall thickness decreases, we show that the excitation spectrum is dominated by the « in plane modes ». We discuss the validity of this model for nano-objects with vanishing wall thickness.


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