scholarly journals Seed-Mediated Growth of Ag@Au Nanodisks with Improved Chemical Stability and Surface-Enhanced Raman Scattering

ACS Omega ◽  
2018 ◽  
Vol 3 (10) ◽  
pp. 12600-12608 ◽  
Author(s):  
Siva Kumar Krishnan ◽  
Rodrigo Esparza ◽  
F. J. Flores-Ruiz ◽  
Erika Padilla-Ortega ◽  
Gabriel Luna-Bárcenas ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Chemical Stability ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Seed Mediated

scholarly journals Sensing Performance of Mono and Bimetallic Nano Photonics Surface Enhanced Raman Scattering (SERS) Devices

2021 ◽  
Vol 39 (7) ◽  
pp. 1174-1184
Author(s):  
Doaa S. Jubair ◽  
Alwan M. Alwan ◽  
Walid K. Hamoudi
Keyword(s):  
Raman Scattering ◽  
Chemical Stability ◽  
Surface Enhanced Raman Scattering ◽  
Large Field ◽  
X Ray ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sensing Performance

In this research, sensing performance of mono and bimetallic nanophotonics SERS sensors of gold-silver nano-columns for the detection of chlorpyrifos was investigated. For optimum substrates for Gold-silver/nano-column surface-enhanced, Raman scattering (SERS) was achieved with the silicon substrate. By combining the Ag SERS activity with the Au chemical stability and nano-columns Si large field enhancement, the Au-Ag/nano-columns Si substrate revealed perfect reproducibility, homogeneity, sensitivity in addition to chemical stability. The sensors were tested by Atomic force microscope (AFM), field emission scanning electron microscope (FESEM), energy-dispersive X-ray analysis (EDS), and X-ray diffraction (XRD). Findings presented in this research indicated modified distributions and sizes of formed alloy nanoparticles, and the hot spots junctions within the nanophotonics layer after changing the nanoparticles types. The SERS sensors performance displayed an excellent recognition of ultra-low concentrations of chlorpyrifos solutions with an exponential relationship with the Raman signal. The highest enhancement factor (Ef=1.56×106) and minimum limit of detection 0.069 mg/Kg were obtained with Au-Ag sensors.

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