Open AccessLuminescence and sensitivity enhancement of oxygen sensors through tuning the spectral overlap between luminescent dyes and SiO 2 @Ag nanoparticles
Author(s) -
Yin Wenwen,
Chen Jinxing,
Sui Jiajie,
Dabiri Dana,
Cao Guozhong
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202100131
Subject(s) - luminescence , absorbance , materials science , oxygen sensor , oxygen , quenching (fluorescence) , surface plasmon resonance , analytical chemistry (journal) , plasmon , nanoparticle , photochemistry , chemistry , optoelectronics , nanotechnology , optics , fluorescence , chromatography , physics , organic chemistry
We utilized a seeded growth method to synthesize SiO 2 @Ag NPs with tunable plasmonic resonance peak to investigate the effect of spectral overlap between the SiO 2 @Ag plasmonic resonance spectrum and the PtTFPP‐based oxygen sensors’ absorbance spectra on luminescence enhancement and performance optimization. An organic silicate was used as the matrix. Oxygen‐sensors were produced by directly casting the mixture of NPs and dyes with silicate gels onto glass slides. Oxygen‐induced spectral response of the PtTFPP was obtained as the analytical signal. Our results show that when the plasmonic resonance spectrum of SiO 2 @Ag has a maximum wavelength overlap with the absorbance spectra of dyes, the Stern‐Volmer slopes were enhanced by almost an order of magnitude. At 21% O 2 , the Stern‐Volmer plot achieved a maximum seven‐fold increase over the oxygen sensor without the metal‐enhanced luminescence. Our results also show that 10% wt NPs is the optimal amount for the PtTFPP‐SiO 2 @Ag based oxygen sensors that can eliminate self‐quenching and the NRET process. These data confirm that the spectral overlap between the dyes and noble metal NPs and how to eliminate self‐quenching and the NRET process are vital to high‐sensitive oxygen sensors. We have also shown that our fabrication process of these oxygen sensors is repeatable.