AI Article Synopsis
- The study investigated how γ-ray irradiation affects the surface plasmon resonance (SPR) of silica optical fiber containing gold nanoparticles (NPs).
- As exposure time increased, the morphology of the gold NPs changed, resulting in larger clusters and a shift in the SPR spectrum to longer wavelengths.
- The sensitivity of the SPR also enhanced significantly, increasing from 407 nm/RIU to values as high as 3553 nm/RIU with higher doses of γ-ray irradiation.
Article Abstract
The effect of γ-ray irradiation on the surface plasmon resonance (SPR) sensing capability of refractive index (n = 1.418⁻1.448) of the silica glass optical fiber comprised of germano-silicate glass cladding embedded with Au nano-particles (NPs) was investigated. As the γ-ray irradiation increased from 1 h to 3 h with the dose rate of 1190 Gy/h, the morphology of the Au NPs and the SPR spectrum were found to change. The average diameter of Au NPs increased with the aspect ratio from 1 to 2, and the nano-particles became grown to the clusters. The SPR band wavelength shifted towards a longer wavelength with the increase of total dose of γ-ray irradiation regardless of the corresponding refractive indices. The SPR sensitivities (wavelength/refractive index unit, nm/RIU) also increased from 407 nm/RIU to 3553 nm/RIU, 1483 nm/RIU, and 2335 nm/RIU after the γ-ray irradiation at a total dose of 1190 Gy, 2380 Gy, and 3570 Gy, respectively.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6480348 | PMC |
| http://dx.doi.org/10.3390/s19071666 | DOI Listing |
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