Browsing by Author "Brooks, R"

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    Luminescence from copper nanoparticles
    (SPRINGER-VERLAG) Townsend, PD; Brooks, R; Hole, DE; Wu, Z; Turkler, A; Can, N; Suarez-Garcia, A; Gonzalo, J
    The presence of copper nanoparticles in alumina and silica modifies their luminescence, and the changes in spectra are influenced by variations in the nanoparticle size distributions. Luminescence signals are sensitive to the total defect population. Thus the luminescence not only reflects changes caused by thermal annealing, which can modify both intrinsic defects and the copper nanoparticles, but also responds to the method of preparation of thin film layers. Copper nanoparticle influence on luminescence is reported both for ion-implanted bulk silica and for copper in pulsed laser deposition within alumina. Luminescence thus potentially offers a non-destructive monitor of the layer quality, reproducibility and growth conditions, as well as the state and size of the copper nanoparticles.
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    Luminescence characterisation of defects in pld alumina and copper implanted silica
    (ELSEVIER SCIENCE BV) Wu, Z; Türkler, A; Brooks, R; Hole, DE; Townsend, PD; Köster, SF; Kurt, K; Gonzalo, J; Suarez-Garcia, A
    Luminescence is reported for alumina and Al2O3:Cu films grown by pulsed laser deposition and is contrasted with luminescence from Cu ion implanted silica. The implanted samples display numerous emission bands with at least two associated to charge states or the Cu ions. The relative band intensities are altered by thermal treatments. In the case of the thin films the signals are sensitive to the growth conditions and show evidence for trapped Ar nanoparticles, from argon used as a background gas during film growth. Thus in both thin film and ion implanted material the luminescence offers a route to monitor the state of the defects and the copper impurity ions. (C) 2002 Published by Elsevier Science B.V.