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Au/SiO2 nanoparticles in TiO2:Sm3+ films for improved fluorescence sensing of oxygen
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1039/c7tc03704j Leonid Dolgov 1, 2, 3, 4, 5 , Marko Eltermann 6, 7, 8, 9 , Sven Lange 6, 7, 8, 9 , Valter Kiisk 6, 7, 8, 9 , Lei Zhou 1, 2, 3, 4, 5 , Jianxin Shi 1, 2, 3, 4, 5 , Mingmei Wu 1, 2, 3, 4, 5 , Raivo Jaaniso 6, 7, 8, 9
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1039/c7tc03704j Leonid Dolgov 1, 2, 3, 4, 5 , Marko Eltermann 6, 7, 8, 9 , Sven Lange 6, 7, 8, 9 , Valter Kiisk 6, 7, 8, 9 , Lei Zhou 1, 2, 3, 4, 5 , Jianxin Shi 1, 2, 3, 4, 5 , Mingmei Wu 1, 2, 3, 4, 5 , Raivo Jaaniso 6, 7, 8, 9
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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.
中文翻译：
TiO 2：Sm 3+薄膜中的Au / SiO 2纳米颗粒可改善氧气的荧光感应
尽管用氧气作为淬灭剂，但对于用Au / SiO 2纳米颗粒装饰的TiO 2：Sm 3+膜，仍然显示出由氧气引起的Sm 3+荧光强度的强烈增加。微发光研究表明，紫外光激发的Sm 3+离子的发射集中在Au / SiO 2纳米颗粒周围，这表明金对它敏感。O 2：N 2气体混合物中氧气浓度的周期性变化导致Sm 3+强度的相应调节荧光。与原始的TiO 2：Sm 3+薄膜相比，用Au / SiO 2纳米颗粒装饰的样品的荧光强度变化最明显的是10倍。这表明Sm 3+荧光是通过Au / SiO 2纳米颗粒表面上存在的金团簇的能量转移而敏化的。氧感应效应由模型解释，其中氧改变了TiO 2晶格中能量接受缺陷的状态，并以此方式防止了它们参与Sm 3+荧光的猝灭。
更新日期：2017-11-15
中文翻译：
TiO 2：Sm 3+薄膜中的Au / SiO 2纳米颗粒可改善氧气的荧光感应
尽管用氧气作为淬灭剂，但对于用Au / SiO 2纳米颗粒装饰的TiO 2：Sm 3+膜，仍然显示出由氧气引起的Sm 3+荧光强度的强烈增加。微发光研究表明，紫外光激发的Sm 3+离子的发射集中在Au / SiO 2纳米颗粒周围，这表明金对它敏感。O 2：N 2气体混合物中氧气浓度的周期性变化导致Sm 3+强度的相应调节荧光。与原始的TiO 2：Sm 3+薄膜相比，用Au / SiO 2纳米颗粒装饰的样品的荧光强度变化最明显的是10倍。这表明Sm 3+荧光是通过Au / SiO 2纳米颗粒表面上存在的金团簇的能量转移而敏化的。氧感应效应由模型解释，其中氧改变了TiO 2晶格中能量接受缺陷的状态，并以此方式防止了它们参与Sm 3+荧光的猝灭。
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