Mechanism of Gold–Silver Alloy Nanoparticle Formation by Laser Coreduction of Gold and Silver Ions in Solution

2021 ◽  
Vol 125 (3) ◽  
pp. 907-917
Author(s):  
Christopher M. Nguyen ◽  
Laysa M. Frias Batista ◽  
Mallory G. John ◽  
Collin J. Rodrigues ◽  
Katharine Moore Tibbetts
Keyword(s):  
Silver Ions ◽  
Silver Alloy ◽  
Nanoparticle Formation ◽  
Gold Silver

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 Optical and Electrical Properties of Gold-Silver Nanoalloys Synthesized through Photochemical Reduction using Femtosecond Laser

2020 ◽  
Vol 9 (3) ◽  
pp. 177-184
Author(s):  
Affi Nur Hidayah ◽  
◽  
Yuliati Herbani ◽  
Keyword(s):  
Electrical Properties ◽  
Femtosecond Laser ◽  
Au Nanoparticles ◽  
Volume Fraction ◽  
Conductivity Measurement ◽  
Silver Ions ◽  
Optical And Electrical Properties ◽  
Photochemical Reduction ◽  
Direct Irradiation ◽  
Gold Silver

In this work we investigated the optical and electrical properties of Au-Ag nanoalloys in various volume ratios. The nanoparticles have been prepared from gold and silver ions reduced by direct irradiation femtosecond laser. The samples were added into a quartz cuvette and irradiated for 10 minutes. Each sample was observed the optical property where surface plasmon resonance (SPR) peak was existed. In addition, electrical conductivity of the colloids was derived from the measurement of the correspond zeta potential by dynamic light scattering (DLS) method. The results showed that the SPR peak of Au-Ag nanoalloy were shifted almost linearly in between 409 nm for Ag and 530 nm for Au depending on their volume fraction. The conductivity measurement showed that Au0Ag100 (pure Ag) nanoparticles has the highest value and Au100Ag0 (pure Au) nanoparticles has the lowest value, and interestingly, Au-Ag nanoalloys have the values between Au0Ag100 and Au100Ag0. Briefly, this work revealed that both optical and electrical properties of Au-Ag nanoalloys can be easily tuned by regulating the volume fraction between the two elements.

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

Biologically Benign Multi-functional Mesoporous Silica Encapsulated Gold/Silver Nanorods for Anti-bacterial Applications by On-demand Release of Silver Ions

2019 ◽  
Vol 13 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Seokyoung Yoon ◽  
Younghwan Chung ◽  
Jin Woong Lee ◽  
Junhyuck Chang ◽  
Jeon Geon Han ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silver Ions ◽  
Silver Nanorods ◽  
On Demand ◽  
Gold Silver
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