Si nanocrystals obtained through polymer pyrolysis

Sorarù, Gian Domenico; Modena, Stefano; Bettotti, Paolo; Das, Gobind; Mariotto, Gino; Pavesi, Lorenzo
July 2003
Applied Physics Letters;7/28/2003, Vol. 83 Issue 4, p749
Academic Journal
In this letter, we report the formation of bulk samples of silica-based glass containing Si nanocrystals (Si-ncs) by pyrolysis of a preceramic precursor. The starting precursor is a sol– gel-derived polysiloxane containing only Si–H groups which leads, after annealing in a controlled atmosphere in the range 1000–1200 ?C, to the precipitation of Si-ncs. Characterization of the nanostructure was performed by x-ray diffraction and Raman scattering analyses. Room-temperature luminescence experiments show the interesting optical properties of the Si-ncs/SiO[sub;2] material.


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