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New phenomenon in the channels of mesoporous silicate CMI1: quantum size effect and two-photon absorption of ZnO nanoparticles

New phenomenon in the channels of mesoporous silicate CMI1: quantum size effect and two-photon absorption of ZnO nanoparticles,10.1007/s00339-007-3955

New phenomenon in the channels of mesoporous silicate CMI1: quantum size effect and two-photon absorption of ZnO nanoparticles   (Citations: 1)
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Quantum size effect (QSE) and very efficient laser action were observed in ZnO-mesoporous CMI-1 silica nanocomposites prepared through the incorporation of ZnO nanoparticles inside the channels of a silica mesoporous material CMI-1. The incorporation was made by direct impregnation of the mesoporous material in a zinc nitrate aqueous solution followed by calcination. The PL spectrum of the nanocomposites presents a significant blue-shift corresponding to the enhancement of the semiconductor band gap. Being excited by incident photons with energy of 1.82 eV, the ZnO nanoparticles exhibit spontaneous emission due to the excitonic recombination. In our samples, spontaneous emission turns to stimulated emission when the pumping intensity reaches a threshold value. This effect implies a two-photon excitation which was never observed with ZnO nanoparticles. This paper deals with results about the characteristics of the matrix and the nanocomposites and the lasing effect. A two-photon excitation phenomenon has been observed.
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