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

作者：Dolgov Leonid^*; Eltermann Marko; Lange Sven; Kiisk Valter; Zhou Lei; Shi Jianxin; Wu Mingmei^*; Jaaniso Raivo

来源：Journal of Materials Chemistry C, 2017, 5(45): 11958-11964.

DOI：10.1039/c7tc03704j

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 O-2:N-2 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 dusters 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.

• 出版日期2017-12-7
• 单位中山大学