Morphologically manipulated Ag/ZnO nanostructures as surface enhanced Raman scattering probes for explosives detection

Shaik, Ummar Pasha; Hamad, Syed; Mohiddon, Md. Ahamad; Soma, Venugopal Rao; Krishna, M. Ghanashyam

doi:10.1063/1.4943034

Cited by 34 publications

(22 citation statements)

References 48 publications

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“…The constructive Raman band at 1512 cm −1 was selected to estimate the SERS enhancement factor (EF) based on the following Equation 1 [ 39 ]: EF = ( I SERS / N NR )/( I NR / N SERS ） where I SERS is the SERS intensity of R6G on PS PCs and I NR is the normal Raman intensity of R6G at the same band. N NR and N SERS represent the corresponding numbers of molecules in the focused incident beam on the substrate, which can be estimated using a reported method [ 40 ]. In our experiments, the focus area of the laser beam is ~4 μm 2 .…”

Section: Resultsmentioning

confidence: 99%

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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Picric acid (PA) is an organic substance widely used in industry and military, which poses a great threat to the environment and security due to its unstable, toxic, and explosive properties. Trace detection of PA is also a challenging task because of its highly acidic and anionic character. In this work, silver nanoparticles (AgNPs)-decorated porous silicon photonic crystals (PS PCs) were controllably prepared as surface-enhanced Raman scattering (SERS) substrates using the immersion plating solution. PA and Rhodamine 6G dye (R6G) were used as the analyte to explore the detection performance. As compared with single layer porous silicon, the enhancement factor of PS PCs substrates is increased to 3.58 times at the concentration of 10−6 mol/L (R6G). This additional enhancement was greatly beneficial to the trace-amount-detection of target molecules. Under the optimized assay condition, the platform shows a distinguished sensitivity with the limit of detection of PA as low as 10−8 mol/L, the linear range from 10−4 to 10−7 mol/L, and a decent reproducibility with a relative standard deviation (RSD) of ca. 8%. These results show that the AgNPs-modified PS PCs substrates could also find further applications in biomedical and environmental sensing.

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Section: Resultsmentioning

confidence: 99%

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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“…Because the same volume of the solution was applied in both substrates and their surfaces had similar hydrophilicity (determining the drop spreading), it is possible to assume that A SERS ≈ A Raman = 3.14 mm 2 . The dimensionless adsorption factor on the SERS substrate, η , was taken to be 0.3 in accordance with previous reports that use similar types of substrates [ 80 ]. This adsorption factor is based on the Langmuir isotherm and can be expressed in the form η = 1/(1 + K c 0 ), where c 0 is the initial concentration of the analyte at saturation level and K the equilibrium binding constant.…”

Section: Resultsmentioning

confidence: 99%

3D ZnO/Ag Surface-Enhanced Raman Scattering on Disposable and Flexible Cardboard Platforms

et al. 2017

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In the present study, zinc oxide (ZnO) nanorods (NRs) with a hexagonal structure have been synthesized via a hydrothermal method assisted by microwave radiation, using specialized cardboard materials as substrates. Cardboard-type substrates are cost-efficient and robust paper-based platforms that can be integrated into several opto-electronic applications for medical diagnostics, analysis and/or quality control devices. This class of substrates also enables highly-sensitive Raman molecular detection, amiable to several different operational environments and target surfaces. The structural characterization of the ZnO NR arrays has been carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical measurements. The effects of the synthesis time (5–30 min) and temperature (70–130 °C) of the ZnO NR arrays decorated with silver nanoparticles (AgNPs) have been investigated in view of their application for surface-enhanced Raman scattering (SERS) molecular detection. The size and density of the ZnO NRs, as well as those of the AgNPs, are shown to play a central role in the final SERS response. A Raman enhancement factor of 7 × 105 was obtained using rhodamine 6 G (R6G) as the test analyte; a ZnO NR array was produced for only 5 min at 70 °C. This condition presents higher ZnO NR and AgNP densities, thereby increasing the total number of plasmonic “hot-spots”, their volume coverage and the number of analyte molecules that are subject to enhanced sensing.

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“…It is evident that the SERS spectra show the prospective detection of an ultra-low concentration of 1 nM. Ten arbitrary spots were chosen to estimate the effective enhancement factor (EF) by adopting the conventional method of accounting for the adsorption factor h. 42,43 The EF in the case of R6G with a concentration of 1 nM was estimated to be 8.5 Â 10 7 and was compared with existing reported values, as summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Robust and cost-effective silver dendritic nanostructures for SERS-based trace detection of RDX and ammonium nitrate

2020

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Morphologically manipulated Ag/ZnO nanostructures as surface enhanced Raman scattering probes for explosives detection

Cited by 34 publications

References 48 publications

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

3D ZnO/Ag Surface-Enhanced Raman Scattering on Disposable and Flexible Cardboard Platforms

Robust and cost-effective silver dendritic nanostructures for SERS-based trace detection of RDX and ammonium nitrate

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