Volume 56, Number 3, November 2001
|Page(s)||386 - 392|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Investigation of confined acoustic phonons of tin nanoparticles during melting
INFM, Dipartimento di Ingegneria Nucleare,
Politecnico di Milano Via Ponzio 34/3, 20133 Milano,
2 INFM, Dipartimento di Fisica "A. Volta" , Università degli Studi di Pavia Via A. Bassi 6, 27100 Pavia, Italy
3 Laboratoire de Physique de la Matière Condensée, URA 190 Université de Nice-Sophia Antipolis - 06108 Nice Cedex, France
Accepted: 2 August 2001
Both confined acoustic and optic phonons were detected in tin nanoparticles embedded in a x thin film, using inelastic light scattering, for different values of the particle size. The eigenfrequencies of the acoustic modes are in agreement with theoretical calculations for the free vibrations of an elastic sphere. By increasing the temperature, clear effects of particle melting on the optical and acoustic modes were observed, together with the detection of a coupling with a strong central peak. The observation of melting, and surface melting, through direct investigation of the nanoparticle acoustic vibrational eigenmodes represents a novel and relevant feature of this work.
PACS: 61.46.+w – Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 78.30.-j – Infrared and Raman spectra / 62.30.+d – Mechanical and elastic waves; vibrations
© EDP Sciences, 2001
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