The complete Raman spectrum of nanometric SnO2 particles

The complete Raman spectrum of SnO2 nanoparticles in presented and analyzed . In addition to the "classical" modes observed in the rutile structure, tw o other regions shown Raman activity for nanoparticles. The Raman bands in the low-frequency region are attributed to acoustic modes associated with t he vibration of the individual nanoparticle as a whole. The high-frequency region is activated by surface disorder. A detailed analysis of these regio ns and the changes in the normal modes of SnO2 are presented as a function nanoparticle size. (C) 2001 American Institute of Physics.