Abstract
Quartz glass samples and compacted SiO2 nanopowders have been studied by x-ray emission (CuL2, 3 transition 3d4s → 2p1/2, 3/2) and photoluminescence spectroscopy following pulsed Cu+ ion implantation (energy, 30 keV; pulse current up to 0.5 A; pulse duration, 400 μs; irradiation doses, 1015, 1016, and 2 × 1017 cm−2). It has been established that ion irradiation gives rise to the formation of glassy and compacted SiO2 samples of nanosized metallic and oxide phases in the structure. An analysis of CuL x-ray emission spectra has shown that copper nanoparticles are thermodynamically metastable and chemically active because ion beam bombardment transfers them readily to the oxide form. This results from the radiation-stimulated fracture of regular Si-O-Si bonds in amorphous SiO2 and the formation of defective Si-Si bonds, followed by capture of oxygen by copper atoms. The enhanced degree of oxidation of copper ions in SiO2 nanostructured pellets can be reduced by coimplantation and thermal annealing. Optical spectroscopy studies suggest that, in glasses and SiO2 nanostructured pellets, there exist metallic Cun0 nanoclusters, which at low temperatures exhibit quantum-confined photoluminescence with a characteristic stepped excitation spectrum.
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