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Issue 45, 2017
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Au/SiO2 nanoparticles in TiO2:Sm3+ films for improved fluorescence sensing of oxygen

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Abstract

A strong increase in Sm3+ fluorescence intensity caused by oxygen gas is revealed for TiO2:Sm3+ films decorated with Au/SiO2 nanoparticles in spite of the general view of oxygen as a quenching agent. Microluminescence studies revealed that emission from Sm3+ ions excited by UV light is concentrated around Au/SiO2 nanoparticles, which implies its sensitization by gold. Periodic changes in the oxygen concentration in the O2:N2 gaseous mixture led to respective modulation of the intensity of Sm3+ fluorescence. The changes in fluorescence intensity were up to 10 times more pronounced for the samples decorated with Au/SiO2 nanoparticles in comparison with virgin TiO2:Sm3+ films. It is suggested that Sm3+ fluorescence is sensitized by energy transfer from gold clusters presented on the surface of the Au/SiO2 nanoparticles. The oxygen-sensing effect is explained by the model in which oxygen changes the state of energy accepting defects in the TiO2 lattice and in such a way prevents their participation in quenching of Sm3+ fluorescence.

Graphical abstract: Au/SiO2 nanoparticles in TiO2:Sm3+ films for improved fluorescence sensing of oxygen

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Publication details

The article was received on 15 Aug 2017, accepted on 30 Oct 2017 and first published on 31 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC03704J
Citation: J. Mater. Chem. C, 2017,5, 11958-11964
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    Au/SiO2 nanoparticles in TiO2:Sm3+ films for improved fluorescence sensing of oxygen

    L. Dolgov, M. Eltermann, S. Lange, V. Kiisk, L. Zhou, J. Shi, M. Wu and R. Jaaniso, J. Mater. Chem. C, 2017, 5, 11958
    DOI: 10.1039/C7TC03704J

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