Carbon Nanodot-Decorated Ag@SiO2 Nanoparticles for Fluorescence and Surface-Enhanced Raman Scattering Immunoassays

2015 ◽  
Vol 8 (1) ◽  
pp. 1033-1040 ◽  
Author(s):  
Xianfeng Zhang ◽  
Xuezhong Du
Keyword(s):  
Raman Scattering ◽  
Sio2 Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Gold Film over SiO2 Nanospheres—New Thermally Resistant Substrates for Surface-Enhanced Raman Scattering (SERS) Spectroscopy

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1426 ◽  
Author(s):  
Karel Kouba ◽  
Jan Proška ◽  
Marek Procházka
Keyword(s):  
Raman Scattering ◽  
Gold Film ◽  
High Sensitivity ◽  
Sio2 Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Plasmonic Nanostructures ◽  
Sers Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) sensors are constructed from metallic plasmonic nanostructures providing high sensitivity and spectral reproducibility. In many cases, irradiation of the SERS substrate by the laser beam leads to an increase of the local temperature and consequently to thermal degradation of metallic nanostructure itself and/or adsorbed analyte. We report here a “bottom-up” technique to fabricate new thermally resistant gold “film over nanosphere” (FON) substrates for SERS. We elaborated the simple and straightforward method of preparation of homogeneously and closely packed monolayer of SiO2 nanoparticles (50 nm in diameter) and covered it by a thin (20 nm) layer of magnetron-sputtered gold. The spectral testing using biologically important molecules (methylene blue, cationic porphyrin, and fungicide 1-methyl-1H-benzimidazole-2-thiol) proved a sensitivity and reproducibility of our AuSiO2 substrates. The main advantage of such SERS-active substrates is high thermal stability and low intensity of background and signal of graphitic carbon.

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