The layered nanocomposites of Ag nanoparticles (NPs) and ZnO were laser fabricated and investigated. The double layer (DL) nanostructures of AgNPs/ZnO and the multilayer (ML) nanostructures of AgNPs/ZnO/AgNPs/ZnO on SiO2 substrate were produced. The Ag thin films were decomposed into nanoparticles by laser annealing. The samples were characterized by UV-VIS transmission spectroscopy, Raman spectroscopy and photoluminescence (PL) emission study. A characteristic resonance absorption peak was registered for all the samples at the range of 440 – 530 nm. The Raman spectrum taken for the DL and ML structures significantly differs from the spectrum of bulk ZnO. Usually, the 1LOphonon frequency is between 574 and 591 cm⁻¹. The 1LO peak of ML nanostructure appears at 564 cm⁻¹, which indicates a redshift of more than 10 cm⁻¹. The PL enhancement occurs after annealing and is due to the morphology changes in the nanoscale structures. Room temperature photoluminescence spectrum shows green emission enhancement at 560 nm for the DL structure, while the characteristic ZnO emission enhancement at 380 nm was registered for the ML structure.

Date Published: 8 January 2015
PDF: 7 pages
Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470E (8 January 2015); doi: 10.1117/12.2087769

Published in SPIE Proceedings Vol. 9447:
18th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Sanka Gateva; Alexandros Serafetinides, Editor(s)