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Quantum Size Effect and very localized random laser in ZnO@mesoporous silica nanocomposite following a two-photon absorption process
Authors:Claire Bouvy  Evgeny Chelnokov  Wladimir Marine  Robert Sporken  Bao-Lian Su
Affiliation:1. Laboratory of Inorganic Materials Chemistry, University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium;2. Institute of Applied Physics, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia;3. Centre de Recherche en Matière Condensée et Nanosciences, UPR 7251 CNRS, Université de la Méditerranée, France;4. Laboratoire de Physique des Matériaux Electroniques, University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium;5. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, Hubei, P. R. China
Abstract:
ZnO@mesoporous silica nanocomposite was prepared by the impregnation of a CMI-1 material in a Zn(NO3)2 solution followed by calcination under O2. Intensive characterization was carried out by N2 adsorption–desorption measurements, scanning and transmission electron microscopy. The optical properties of the ZnO@mesoporous silica nanocomposite were studied by photoluminescence spectroscopy. Quantum Size Effect was firstly demonstrated by subjecting the sample to a 254 nm excitation light, and was further confirmed by using a 680 nm excitation laser beam, which implies a two-photon absorption process. By focusing the 680 nm laser beam on different places in the sample, a very localized random laser effect, also induced by a two-photon absorption process, was detected.
Keywords:
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