Luminescence and sensitivity enhancement of oxygen sensors through tuning the spectral overlap between luminescent dyes and SiO2@Ag nanoparticles
Abstract
We utilized a seeded growth method to synthesize SiO2@Ag NPs with tunable plasmonic resonance peak to investigate the effect of spectral overlap between the SiO2@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 SiO2@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% O2, 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‐SiO2@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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 19, 2021
- Source ID
- 10.1002/nano.202100131
Entities
People
- Dana Dabiri
- Guozhong Cao
- Jiajie Sui
- Jinxing Chen
- Wenwen Yin
Organizations
- Army Research Office
- Soochow University
- University of Washington