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15 September 2010 Enhancement in sensitivity and detection of luminescent quenching based oxygen sensing by gold nanoparticles
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Proceedings Volume 7750, Photonics North 2010; 775006 (2010)
Event: Photonics North 2010, 2010, Niagara Falls, Canada
The field of plasmonics has shown a great promise in the enhancement of luminescence detection. Here, a simple method to enhance oxygen detection by quenching of Ru[(4,7-diphenyl-1,10-anthroline)3]2+ (or Ru[dpp]2+) in a sol-gel matrix by localized surface plasmon resonance (LSPR) of gold nanoparticles (AuNP) is presented. In the experiments, AuNP (10 ± 1.5 nm diameter) were added to a sol that was prepared by hydrolysis of trimethoxysilane, octyltrimethoxysilane and ethanol in the presence of Ru[dpp]2+ luminophore. The resulting sol of the mixture was spincoated on glass and allowed to age in the dark for one week to form the sol-gel film. A control sample was also prepared using the procedure, except that AuNP was not added to the sol. The resulting AuNP embedded sol-gel shows 8.3 times improvement in the baseline (0% O2) intensity (I0) over the control. Moreover, there is a dramatic improvement in the sensitivity from 0.0011 per % O2 in the control to 0.059 per % O2 with AuNP, for O2 level below 15%. Signal to noise ratio also improved, thus leading to a 100-fold improvement in the detection limit. Using phaseluminometry, it was determined that there is a reduction in the luminescence lifetime when AuNP is added to the sol-gel matrix. This reduction in the lifetime can be explained by the near-field interaction between the luminophores and the AuNP.
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Maurice C.-K. Cheung, Philip J. R. Roche, Lei Yao, Andrew G. Kirk, and Vamsy P. Chodavarapu "Enhancement in sensitivity and detection of luminescent quenching based oxygen sensing by gold nanoparticles", Proc. SPIE 7750, Photonics North 2010, 775006 (15 September 2010);

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