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The European Physical Journal D

, Volume 49, Issue 2, pp 201–210 | Cite as

Optical characterization and manipulation of alkali metal nanoparticles in porous silica

  • A. BurchiantiEmail author
  • A. Bogi
  • C. Marinelli
  • C. Maibohm
  • E. Mariotti
  • S. Sanguinetti
  • L. Moi
Article

Abstract

Rubidium and cesium metal nanoparticles were grown in nanoporous silica samples placed in alkali vapor cells. Their size and shape were investigated by measuring the sample optical transmittance. Spectral changes due to photodesorption processes activated by weak light were also analyzed. Alkali atoms photoejected from the silica walls diffuse through and out of the nanopores, modifying both the nanoparticle distribution in the silica matrix and the atomic vapor pressure in the cell volume. The number of rubidium and cesium atoms burst out of the samples was measured as a function of photon energy and fluence. The optical absorption measurements together with the analysis of the photodesorption yield give a complete picture of the processes triggered by light inside the nanopores. We show that atomic photodesorption, upon proper choice of light frequency and intensity, induces either growth or evaporation of nanosized alkali metal clusters. Cluster size and shape are determined by the host-guest interaction.

PACS

78.67.Bf Nanocrystals and nanoparticles 68.43.Tj Photon stimulated desorption 64.70.Nd Structural transitions in nanoscale materials 

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Copyright information

© Springer 2008

Authors and Affiliations

  • A. Burchianti
    • 1
    Email author
  • A. Bogi
    • 1
  • C. Marinelli
    • 1
  • C. Maibohm
    • 1
    • 2
  • E. Mariotti
    • 1
  • S. Sanguinetti
    • 3
  • L. Moi
    • 1
  1. 1.CNISM and Physics DepartmentUniversity of SienaSienaItaly
  2. 2.Mads Clausen InstituteNanoSYD, University of Southern DenmarkSønderborgDenmark
  3. 3.Physics DepartmentUniversity of PisaPisaItaly

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