The complete Raman spectrum of SnO 2 nanoparticles in presented and analyzed. In addition to the ''classical'' modes observed in the rutile structure, two other regions shown Raman activity for nanoparticles. The Raman bands in the low-frequency region are attributed to acoustic modes associated with the vibration of the individual nanoparticle as a whole. The high-frequency region is activated by surface disorder. A detailed analysis of these regions and the changes in the normal modes of SnO 2 are presented as a function nanoparticle size.

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