Abstract
Starting with crystalline silicon nanoparticles, which were produced byCO2 laser pyrolysis of silane in a gas flow reactor, we have synthesized amorphous silicananoparticles via oxidation. Upon excitation with UV light, the novel nanostructuredmaterial gives rise to an intense red photoluminescence (PL) which resembles that of somesilicon nanostructures. Transmission electron microscopy studies and electron energy lossspectroscopy confirm that the nanoparticles are composed of amorphous silicaand that the majority of them are hollow. The strong red PL is attributed todefects or molecular species located at the inner and outer surfaces of the hollownanoparticles. Its similarity to the PL of nanostructured silicon seems fortuitous.
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