Photo-induced modifications of the substrate-adsorbate interaction in K-loaded porous glass

Year: 2015

Authors: Marmugi L., Mariotti E., Burchianti A., Veronesi S., Moi L. Marinelli C.

Autors Affiliation: CNISM and DSFTA, University of Siena, via Roma 56, 53100 Siena, Italy; INO-CNR, uos Pisa, via G. Moruzzi 1, 56124 Pisa, Italy; INO-CNR and LENS, University of Florence, via N. Carrara 1, 50019 Sesto Fiorentino, Italy; NEST Istituto Nanoscienze – CNR, piazza San Silvestro 12 and Physics Department, University of Pisa, largo B. Pontecorvo 3, 56127 Pisa, Italy

Abstract: The effects of visible and infrared light on potassium atoms embedded in a nanoporous glass matrix are investigated. Photodesorption by visible light enhances the atomic mobility and causes the formation of metallic nanoparticles. Two different populations of metastable clusters with absorption bands in the near-infrared and infrared are grown as a consequence of illumination. Atoms can move between the two groups through sequences of adsorption/desorption events at the pore surface. Irradiation with infrared light, instead, does not significantly enhance the atomic diffusion inside the pores. However, it induces relevant modifications of the substrate, thus changing its interaction with the assembled clusters. Consequently, infrared light alters the dynamics of the system, affecting also the evolution of non-resonant nanoparticles populations, even after the illumination sequence. These results provide new insights on the photo-induced modifications of the substrate-adsorbate interaction in nano-sized confined systems.


Volume: 48 (20)      Pages from: 205301  to: 205301

More Information: The authors acknowledge the cell manufacturing by M Badalassi (CNR) and thank C Stanghini and L Stiaccini (University of Siena) for their technical assistance. L Marmugi is currently supported by a Foundation \’Angelo Della Riccia\’ scholarship and by the UCL Quantum Science and Technology Institute UCLQ Fellowship.
KeyWords: Adsorbates; Alkali metals; Atoms; Glass; Infrared devices; Metal nanoparticles; Nanoparticles, Adsorbate interactions; Adsorption/desorption; Atomic diffusions; Confined systems; Metallic nanoparticles; Modified surfaces; Nanoporous glass; Photo-desorption, Ligh
DOI: 10.1088/0022-3727/48/20/205301

Citations: 2
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