Journal
ANALYTICAL METHODS
Volume 14, Issue 33, Pages 3188-3195Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ay00893a
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP20H02601, JP20K21140]
- Chiang Mai University (CMU)
- Japanese Government (MEXT)
- Graduate School (CMU)
- Faculty of Science, CMU
- Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Center of Excellence for Innovation in Chemistry (PERCH-CIC)
- Center of Excellence in Materials Science and Technology
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In this study, the SPR-enhanced fluorescence properties of AuQDs on an Al-coated PDMS grating substrate were investigated by changing the grating pitch through mechanical stretching. The results showed that stretching the grating substrate can tune the SPR excitation wavelength and enhance the fluorescence intensity, which is promising for applications in tunable optical sensors.
In this study, the surface plasmon resonance (SPR)-enhanced fluorescence properties of gold quantum dots (AuQDs) on an aluminum (Al)-coated polydimethylsiloxane (PDMS) grating substrate were investigated by changing the grating pitch via mechanical stretching. The SPR-excitation wavelength of the AuQDs/Al-coated PDMS-grating substrate was tuned by changing the incident light angle from 5 degrees to 60 degrees and stretching it from 0 to 1.0 mm. In addition, the SPR-enhanced fluorescence tuning ability was studied using an AuQD/Al-coated PDMS-grating film by stretching the substrate. The SPR-enhanced fluorescence (SPF) of the AuQDs on the Al-grating was observed using a violet laser as the excitation source at 405 nm with p-polarization. The wavelengths of the SPR excitation, corresponding to the SP-dispersion mode of +1, were shifted to a longer wavelength upon stretching the grating substrate from 0 to 1.0 mm. By stretching the AuQDs/Al-grating PDMS substrate, the SPR-enhanced fluorescence intensity increased at fixed incident angles of 15 degrees and 35 degrees, whereas the SPR-enhanced fluorescence intensity decreased at 40 degrees. Moreover, the SPF could be tuned to exhibit different properties in tunable optical sensors.
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