Controllable formation of plasmonic gold nanoparticles by pulsed laser–induced etching

Hamoudi, Walid K.; Alwan, Alwan M.; Sulaiman, Doaa

doi:10.1007/s11082-020-02466-7

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…This has resulted from the plasmonics effects of bimetallic nanoparticles (hotspot junctions and nanoparticle sizes). The fabricated Si nano-columns with Au-Ag alloy nanoparticles SERS pesticides sensors were tested under different Chlorpyrifos concentrations: 25X10 -8 , 12X10 -7 , 6 X10 -6, and 3X10 -5 M. The enhanced Raman peaks in the SERS spectra of Chlorpyrifos is ascribed to C-C stretching, P-O stretching, P=S stretching, C-Cl stretching and P-O-R stretching bonds at wavenumbers 345 cm -1 , 536 cm -1 , 615 cm -1 , 677 cm -1 and 1099 cm -1 [29] respectively. These Raman peaks are the fingerprint of Chlorpyrifos pesticide.…”

Section: Sensing Performance Of Nanophotonics Sers Pesticides Sensorsmentioning

confidence: 97%

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

Jubair¹,

Alwan²,

Hamoudi³

2021

ETJ

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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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Section: Sensing Performance Of Nanophotonics Sers Pesticides Sensorsmentioning

confidence: 97%

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

Jubair¹,

Alwan²,

Hamoudi³

2021

ETJ

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“…[ 11 ] Crystalline Si surface can be structured in many ways; directly by pulsed laser, plasma, and wet etching. These periodic, [ 12,13 ] porous, [ 14–16 ] or black Si structures are also structured with synthesized plasmonic nanoparticles, [ 17 ] however; those substrates may suffer from the non‐uniformity of the localized surface plasmon resonance (LSPR) along the surface. Even with the uniform coating and strong hot‐spots, ion‐beam lithography techniques suffer from the fabrication costs, time, and small area.…”

Section: Introductionmentioning

confidence: 99%

Laser Photochemical Nanostructuring of Silicon for Surface Enhanced Raman Spectroscopy

Akbıyık

Avishan

Demirtaş

et al. 2022

Advanced Optical Materials

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In this work, a novel method of fabricating large‐area, low‐cost surface‐enhanced Raman spectroscopy (SERS) substrates is explained which yields nanostructured surface utilizing laser‐induced chemical etching of crystalline silicon (Si) in an hydrofluoric acid solution. Nanostructuring of Si surface is followed by deposition of a thin noble metal layer to complete the fabrication procedure. A 50 nm thick silver (Ag) layer is shown to maximize the SERS performance. The SERS effect is attributed to the electromagnetic field enhancement originating from the nanoscale surface roughness of Si that can be controlled by the illumination power, etch duration, and the spot size of the laser beam. The SERS substrates are found to be capable of detecting a Raman analyte dye molecule down to 10−11 m. SERS performance of the Ag deposited substrates are compared to gold (Au) deposited substrates at 660 and 532 nm excitation. Nanostructured Si surface with Ag exhibits stronger SERS than with Au under 532 nm excitation exhibiting an enhancement factor as high as 109. Raman enhancement factor is calculated both by SERS spectra experimentally, and using finite‐elements simulation of the electric field enhancement. The applicability of the fabricated substrates is examined by adsorbing different analytes.

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A comparative study of Ts–Si nano-based layer hybrid configuration for different sensing applications

Alwan¹,

Ahmed²,

Dheyab³

2023

Appl. Phys. A

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Controllable formation of plasmonic gold nanoparticles by pulsed laser–induced etching

Cited by 10 publications

References 17 publications

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

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

Laser Photochemical Nanostructuring of Silicon for Surface Enhanced Raman Spectroscopy

A comparative study of Ts–Si nano-based layer hybrid configuration for different sensing applications

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