scholarly journals Gold-Silver Alloy Film Based Colorful SPR Imaging Sensor with High Sensitivity for Quantitative Chemical and Biological Detection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 931
Author(s):  
Shuang Liang ◽  
Ran Gao ◽  
Mengying Zhang ◽  
Ning Xue ◽  
Zhi-mei Qi
Keyword(s):  
Spectral Range ◽  
Gold Film ◽  
Color Image ◽  
Quantitative Relationship ◽  
Alloy Film ◽  
Resonant Wavelength ◽  
Quantitative Detection ◽  
Silver Alloy ◽  
Refractive Index Sensitivity ◽  
Gold Silver

A gold-silver alloy film based spectral surface plasmon resonance imaging (SPRi) sensor has been prepared for in-situ quantitative detection of biochemical analytes at the sensor surface. This novel sensor has lower detection cost yet higher sensitivity relative to the conventional counterpart with a gold film. Using the laboratory-made multifunctional SPR sensing platform, both the resonant color images and the resonant spectra for the Au-Ag alloy film were measured at different incident angles. The quantitative relationship between the resonant wavelength and the average hue of corresponding resonant color image was established. With this relationship the most hue-sensitive spectral range was determined. After setting the initial resonant wavelength in the hue-sensitive spectral range, the refractive-index sensitivity of the Au-Ag alloy film based SPRi sensor was measured as Δhue/Δnc = 29,879/RIU, being 8 times higher than that obtained with the gold-film SPRi sensor. The immunodetection of benzo(a)pyrene (BaP) in water was fulfilled using the Au-Ag alloy film based SPRi sensor. The average hue of the SPR color image linearly increases with increasing the BaP concentration up to C = 0.5 μg/L and the slope is Δhue/ΔC = 132.2/(μg/L). The sensor is responsive to a change of BaP concentration as low as ΔC = 0.01 μg/L.

Tuning of LSPR of gold-silver alloy nanoparticles with their composition

2019 ◽  
Author(s):  
Devender Kumar ◽  
Saroj Bala ◽  
Heena Wadhwa ◽  
Geeta Kandhol ◽  
Suman Mahendia ◽  
...  
Keyword(s):  
Alloy Nanoparticles ◽  
Silver Alloy ◽  
Gold Silver

scholarly journals Enhanced Plasmonic Resonance Characteristics of AgNRs–Gold Film Hybrid System

2021 ◽  
Vol 8 ◽  
Author(s):  
Yanping Yin ◽  
Jin Zhu ◽  
Zaoji Wang ◽  
Guojun Ma ◽  
Huining Yuan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Aspect Ratio ◽  
Gold Film ◽  
Spectral Response ◽  
Surrounding Medium ◽  
Resonance Wavelength ◽  
Spectral Shift ◽  
Refractive Index Sensor ◽  
Gap Size ◽  
Refractive Index Sensitivity

In recent years, the plasma gap resonance maintained by metal-film-coupled nanostructures has attracted extensive attention. This mainly originates from its flexible control of the spectral response and significantly enhanced field strength at the nanoparticle–film junction. In the present study, the tunability of local surface plasmon resonances (LSPRs) of nanorods coupled to a gold film is studied theoretically. To this end, the plasmonic resonances in the nanostructure of individual silver nanorod–gold film (AgNR-film) with different parameters are investigated. Obtained results show that the refractive index sensitivity (S) of nanostructures to the environment increases as the aspect ratio (Ar) of nanostructures increase. It is found that when the aspect ratio (Ar) is set to 3.5, the figure of merit (FOM) is the highest. Moreover, the variation in the gap distances of the nanorod monomer–gold film, electric field distribution of nanorods dimer, and the corresponding impact on the gold film are studied. It is concluded that the gap size of nanostructures has an exponential correlation with the resonance wavelength. Considering the remarkable influence of the gap size and the surrounding medium environment on the spectral shift of AgNR-film nanostructures, potential applications of the structure as a refractive index sensor and biomolecule measurement are proposed.

Broadband tunable plasmonic substrate using self-assembled gold–silver alloy nanoparticles

2019 ◽  
Vol 19 (11) ◽  
pp. 1245-1251 ◽  
Author(s):  
Phuoc Cao Van ◽  
Srivathsava Surabhi ◽  
Viet Dong Quoc ◽  
Jae Woong Lee ◽  
Cheong Cheon Tae ◽  
...  
Keyword(s):  
Alloy Nanoparticles ◽  
Silver Alloy ◽  
Gold Silver ◽  
Self Assembled

On demand release of ionic silver from gold-silver alloy nanoparticles: fundamental antibacterial mechanisms study

2020 ◽  
Vol 16 ◽  
pp. 100237 ◽  
Author(s):  
S. Panicker ◽  
I.M. Ahmady ◽  
C. Han ◽  
M. Chehimi ◽  
A.A. Mohamed
Keyword(s):  
Alloy Nanoparticles ◽  
Silver Alloy ◽  
Ionic Silver ◽  
On Demand ◽  
Gold Silver
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