Solution processed nanomanufacturing of SERS substrates with random Ag nanoholes exhibiting uniformly high enhancement factors

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 85019-85027 ◽  
Author(s):  
Ritu Gupta ◽  
Soumik Siddhanta ◽  
Gangaiah Mettela ◽  
Swati Chakraborty ◽  
Chandrabhas Narayana ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Electrical Activation ◽  
Raman Signal ◽  
Interference Effects ◽  
Optical Interference ◽  
Solution Processed ◽  
Sers Signal ◽  
Sers Substrates ◽  
Enhancement Factors ◽  
Ag Film

An Ag film exhibits an enhanced Raman signal over unusually large areas due to surface plasmons around its nanoholes. The SERS signal is increased by optical interference effects and the uniformity of the signal is improved by electrical activation.

scholarly journals Facile Detection and Quantification of Acetamiprid Using a Portable Raman Spectrometer Combined with Self-Assembled Gold Nanoparticle Array

Chemosensors ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 327
Author(s):  
Panxue Wang ◽  
Yan Sun ◽  
Li Wang ◽  
Xiang Li ◽  
Miaomiao Liu ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Correlation Coefficients ◽  
Nanoparticle Array ◽  
Sers Signal ◽  
Sers Substrates ◽  
Specificity And Sensitivity ◽  
Exciting Opportunity ◽  
Sers Detection ◽  
Self Assembled ◽  
Detection And Quantification

Rapid and facile determination of pesticides is critically important in food and environmental monitoring. This study developed a self-assembled gold nanoparticle array based SERS method for highly specific and sensitive detection of acetamiprid, a neonicotinoid pesticide that used to be difficult in SERS analysis due to its low affinity with SERS substrates. SERS detection and quantification of acetamiprid was conducted with self-assembled gold nanoparticle arrays at the interface of chloroform and water as the enhancing substrate. Since targets dissolved in chloroform (organic phase) also have access to the hot-spots of Au NP array, the developed method exhibited good sensitivity and specificity for acetamiprid determination. Under the optimal conditions, SERS intensities at Raman shifts of 631 cm−1 and 1109 cm−1 displayed a good linear relationship with the logarithm concentration of acetamiprid in the range of 5.0 × 10−7 to 1.0 × 10−4 mol/L (0.11335 ppm to 22.67 ppm), with correlation coefficients of 0.97972 and 0.97552, respectively. The calculated LOD and LOQ of this method were 1.19 × 10−7 mol/L (0.265 ppb) and 2.63 × 10−7 mol/L (0.586 ppb), respectively, using SERS signal at 631 cm−1, and 2.95 × 10−7 mol/L (0.657 ppb) and 3.86 × 10−7 mol/L (0.860 ppb) using SERS signal at 1109 cm−1, respectively. Furthermore, the developed SERS method was successfully applied in determining acetamiprid on the surface of apple and spinach. This method offers an exciting opportunity for rapid detection of acetamiprid and other organic pesticides considering its advantages of simple preparation process, good specificity and sensitivity, and short detection time (within 1 h).

Surface roughness boosts the SERS performance of imprinted plasmonic architectures

2016 ◽  
Vol 4 (18) ◽  
pp. 3970-3975 ◽  
Author(s):  
Gerard Macias ◽  
María Alba ◽  
Lluís F. Marsal ◽  
Agustín Mihi
Keyword(s):  
Surface Roughness ◽  
Plasmonic Crystals ◽  
Sers Substrates ◽  
Enhancement Factors

Rough 2D plasmonic crystals pose as inexpensive and easily processed SERS substrates exhibiting enhancement factors up to 1.6 × 1010.

scholarly journals Indirect Quantification of Glyphosate by SERS Using an Incubation Process With Hemin as the Reporter Molecule: A Contribution to Signal Amplification Mechanism

2020 ◽  
Vol 8 ◽  
Author(s):  
Karen A. López-Castaños ◽  
Luis A. Ortiz-Frade ◽  
Erika Méndez ◽  
Enrique Quiroga-González ◽  
Miguel A. González-Fuentes ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Excitation Wavelength ◽  
Raman Signal ◽  
Sers Substrate ◽  
Silver Surface ◽  
Indirect Determination ◽  
Sers Substrates ◽  
Resonance Properties ◽  
Equilibrium Process ◽  
Vinyl Group

The indirect determination of the most used herbicide worldwide, glyphosate, was achieved by the SERS technique using hemin chloride as the reporter molecule. An incubation process between hemin and glyphosate solutions was required to obtain a reproducible Raman signal on SERS substrates consisting of silicon decorated with Ag nanoparticles (Si-AgNPs). At 780 nm of excitation wavelength, SERS spectra from hemin solutions do not show extra bands in the presence of glyphosate. However, the hemin bands increase in intensity as a function of glyphosate concentration. This allows the quantification of the herbicide using as marker band the signal associated with the ring breathing mode of pyridine at 745 cm−1. The linear range was from 1 × 10−10 to 1 × 10−5 M and the limit of detection (LOD) was 9.59 × 10−12 M. This methodology was successfully applied to the quantification of the herbicide in honey. From Raman experiments with and without silver nanoparticles, it was possible to state that the hemin is the species responsible for the absorption in the absence or the presence of the herbicide via vinyl groups. Likewise, when the glyphosate concentration increases, a subtle increase occurs in the planar orientation of the vinyl group at position 2 in the porphyrin ring of hemin over the silver surface, favoring the reduction of the molecule. The total Raman signal of the hemin-glyphosate incubated solutions includes a maximized electromagnetic contribution by the use of the appropriate laser excitation, and chemical contributions related to charge transfer between silver and hemin, and from resonance properties of Raman scattering of hemin. Incubation of the reporter molecule with the analyte before the conjugation with the SERS substrate has not been explored before and could be extrapolated to other reporter-analyte systems that depend on a binding equilibrium process.

Centimeter-scale-homogeneous SERS substrates with seven-order global enhancement through thermally controlled plasmonic nanostructures

Nanoscale ◽  
2014 ◽  
Vol 6 (10) ◽  
pp. 5099-5105 ◽  
Author(s):  
Hongmei Liu ◽  
Xinping Zhang ◽  
Tianrui Zhai ◽  
Thomas Sander ◽  
Limei Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Plasmonic Nanostructures ◽  
Solution Processed ◽  
Homogeneous Surface ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Highly homogeneous surface-enhanced Raman scattering substrates were produced on the centimeter scale by annealing solution-processed gold nanoparticles into plasmonic nanoislands.

scholarly journals Fluorescence Enhancement via Dual Coupling of Dye Molecules with Silver Nanostructures

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 217
Author(s):  
Vien Thi Tran ◽  
Heongkyu Ju
Keyword(s):  
Surface Plasmons ◽  
Sio2 Layer ◽  
Silver Nanostructures ◽  
Localized Surface Plasmons ◽  
Dye Molecules ◽  
Excitation Light ◽  
Theoretical Simulation ◽  
Highly Sensitive ◽  
Close Proximity ◽  
Ag Film

We demonstrate the enhancement of fluorescence emitted from dye molecules coupled with two surface plasmons, i.e., silver nanoparticles (AgNPs)-induced localized surface plasmons (LSP) and thin silver (Ag) film supported surface plasmons. Excitation light is illuminated to a SiO2 layer that contains both rhodamine 110 molecules and AgNPs. AgNPs enhances excitation rates of dye molecules in their close proximity due to LSP-induced enhancement of local electromagnetic fields at dye excitation wavelengths. Moreover, the SiO2 layer on one surface of which a 50 nm-thick Ag film is coated for metal cladding (air on the other surface), acts as a waveguide core at the dye emission wavelengths. The Ag film induces the surface plasmons which couple with the waveguide modes, resulting in a waveguide-modulated version of surface plasmon coupled emission (SPCE) for different SiO2 thicknesses in a reverse Kretschmann configuration. We find that varying the SiO2 thickness modulates the fluorescent signal of SPCE, its modulation behavior being in agreement with the theoretical simulation of thickness dependent properties of the coupled plasmon waveguide resonance. This enables optimization engineering of the waveguide structure for enhancement of fluorescent signals. The combination of LSP enhanced dye excitation and the waveguide-modulated version of SPCE may offer chances of enhancing fluorescent signals for a highly sensitive fluorescent assay of biomedical and chemical substances.

Fractal microstructure on Ag film via plasma discharge as SERS substrates

2021 ◽  
Author(s):  
Xue-fen Kan ◽  
Cheng Yin ◽  
Zhuang-qi Cao ◽  
Wei Su ◽  
Ming-lei Shan ◽  
...  
Keyword(s):  
Plasma Discharge ◽  
Sers Substrates ◽  
Ag Film
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