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Nanostructuring Rh(110) Surfaces by Ion Etching

Published online by Cambridge University Press:  01 February 2011

Alessandro Molle ,
Andrea Toma ,
Corrado Boragno ,
Ugo Valbusa  and
Francesco Buatier de Mongeot
Alessandro Molle
Affiliation:
[email protected], Università di Genova, Dipartimento di Fisica, Via Dodecaneso, 33, Genova, 16146, Italy
Andrea Toma
Affiliation:
[email protected], Università di Genova, Dipartimento di Fisica, Via Dodecaneso, 33, Genova, 16146, Italy
Corrado Boragno
Affiliation:
[email protected], Università di Genova, Dipartimento di Fisica, Via Dodecaneso, 33, Genova, 16146, Italy
Ugo Valbusa
Affiliation:
[email protected], Università di Genova, Dipartimento di Fisica, Via Dodecaneso, 33, Genova, 16146, Italy
Francesco Buatier de Mongeot
Affiliation:
[email protected], Università di Genova, Dipartimento di Fisica, Via Dodecaneso, 33, Genova, 16146, Italy, +39 (0)103536324, +39 (0)10311066
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Abstract

The ion irradiation of the Rh(110) surface results in the self-organised formation of various nano-structured morphologies like ripples, mounds, pyramids which have been thoroughly studied as a function of the incidence angle and of the impact energy of the impinging ions. A study of the evolution of the surface ripples at various impact energies above the hot-spot threshold, has been rationalized in terms of a contribution due to an ion-induced surface diffusion mechanism. In the very low ion incidence regime, where the formation of hot spots following ion impact is inhibited, the formation of a rhomboidal pyramid pattern is singled out and attributed to the predominant reorganization of surface adatom and vacancies produced in the topmost surface layers. The metastable rhomboidal pyramid pattern, was recently proven to have extraordinary chemical reactivity since it is endowed with a very high density of undercoordinated step sites runnin along the very open <1-12> azimuthal direction.

Keywords

nanostructurenanoscaleion-beam processing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 960: Symposium N – Self Assembly of Nanostructures Aided by Ion- or Photon-Beam Irradiation—Fundamentals and Applications , 2006 , 0960-N01-02
Copyright
Copyright © Materials Research Society 2007

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References

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