Excellent fabrication of Pd-Ag NPs/PSi photocatalyst based on bimetallic nanoparticles for improving methylene blue photocatalytic degradation

Wali, Layla A.; Alwan, Alwan M.; Dheyab, Amer B.; Hashim, Duaa A.

doi:10.1016/j.ijleo.2018.11.011

Cited by 53 publications

(15 citation statements)

References 34 publications

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“…While, for Ag-NPs /glass SERS sensors, the intensity of Raman peaks suffered a large degradation in intensity with the aging period by a factor of two order of magnitudes. This degradation in intensity is strongly related to the decrease in the density of hot spot regions with the aging time [11]. Also, the growth of the oxide layer leads to an increase in the size of the plasmonic nanoparticles and, hence, a decreased activity of the local antenna (plasmonic nanoparticles) [12].…”

Section: Results and Discussion 31 Plasmonic Featuresmentioning

confidence: 99%

“…Furthermore, the significant advantage of this technique over the other approaches is the formation of high surface-purity nanoparticles without counter ions or residuals of the reducing agents left over on the surfaces of the nanoparticles [8][9][10]. The surface enhanced Raman scattering (SERS) sensors were prepared via the ion reduction process of silver and gold ions by the dangling bonds of the porous silicon layer and, hence, the fabrication of porous silicon-based SERS sensors [11][12][13]. Colloidal suspensions of plasmonic nanoparticles were deposited on glass substrates immobilize them and to inspection those for possible request as an active substrate for sensing of Rohdamine 6G (R6G) via glass-based SERS sensors.…”

Section: Introductionmentioning

confidence: 99%

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The Performance of Plasmonic Gold and Silver Nanoparticle-Based SERS Sensors

Alwan

Mohammed

Shehab

2020

eijs

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The influence of different types of plasmonic gold (Au-NPs) and silver (Ag-NPs) nanoparticles as well as aging on the performance of Surface-Enhanced Raman Scattering (SERS) sensors were studied. The average diameters of Au-NPs and Ag-NPs were about 23 nm and 15 nm, respectively, with a number of laser pulses of about 200. plasmonic nanoparticles were synthesized by laser ablation process in distilled water using a fixed energy laser fluence of about 14 J/cm2 of Nd-YAG laser, with 1060 nm wavelength and 1 Hz pulse repetition rate. The SERS sensor was carried out by quick drop casting process of plasmonicplasmonic nanoparticles on glass substrates. The morphological aspects and the performance of SERS sensors were investigated by high resolution transmission electron microscopy (HR-TEM) and Raman spectroscopy. All the results indicated the significant dependence of the performance of the sensor on the types of the plasmonic nanoparticles . The obtained Raman signal intensity of Ag-NPs was about 105a.u. compared with 103a.u. for Au-NPs. While, the stability of Au-NPs was much higher than that of Ag-NPs based on SERS sensors due to the normal oxidation process of Ag-NPs.

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Section: Results and Discussion 31 Plasmonic Featuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Performance of Plasmonic Gold and Silver Nanoparticle-Based SERS Sensors

Alwan

Mohammed

Shehab

2020

eijs

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“…The structural properties (surface morphology, silicon nanocrystallites, and the amount of nucleation sites) are the very specific parameters for the formation of the plasmonic nanoparticles for the sensor. The PSi morphology is the most particular formation factor for controlling the size of the plasmonic nanoparticle and the density of the hot spot regions, since the density of the dangling bonds (metallic nucleation sites) varies with the type of the morphologies [14,15]. The pores-like and mudlike structures of PSi have different topographical patterns and vary with the formation conditions of the PSi layer [16,17].…”

Section: -Introductionmentioning

confidence: 99%

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

Mahmood¹,

Alwan

2021

eijs

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This work is related to the investigation of the effects of porous silicon (PSi) morphologies on the performance of plasmonic gold nanoparticles (Au-NPs) hot spot SERS sensors for the detection of amoxicillin molecules. Two Si wafers with different resistivity values of 10 and 100 Ω.cm were used to synthesize a PSi layer of pores- and mud-like structures, respectively, by pulsed photo chemical etching process. The hot spot SERS sensors were synthesized by incorporating the Au-NPs within the PSi morphologies of pores- and mud- like structures which are characterized by high density of nucleation sites. Plasmonic Au- NPs with different sizes and hot spot regions were incorporated into the porous structures by the ion reduction process. It was recognized that the PSi morphologies have a considerable influence on the fabrication process of the detection sensors and, consequently, on the detection process. The plasmonic Au-NPs hot spot SERS sensor based on the PSi morphology of the mud-like structures shows higher sensitivity than that of pores-like structures, even at very low concentrations of amoxicillin solutions.

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“…In this path, metal oxide nanomaterials showed excellent photocatalytic activity for the removal of organic dyes due to their high physical, chemical properties, high surface area, high surface energy and quantum confinement effects compared to the counter bulk materials. In the past decade, many catalysis researchers attempted to develop heterogeneous photocatalysts with bimetallic and trimetallic modifications to improve charge transport properties, electronic structure and porosity for enhanced photocatalytic performance [7][8][9][10]. In addition to these properties it is a known fact that, these metal oxides are nature abundant, they show excellent stability under various conditions.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

et al. 2020

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Highly ordered nanoscale disc-like cubic gadolinium doped magnesium zirconate (Gd:MgZrO 3) was synthesized by facile solvothermal route. The reaction time was found to be crucial in determining the final morphology of disc-like Gd:MgZrO 3. After studying the particles from time-dependent experiments, it is observed that, the formation of disc-like particles involved a complex process, in which rod-like or agglomerate particles were favorably formed after the initial thermal treatment. Owing to the chemical instability, they would turn into disc-like particles. After calcination, the generated product possessed good photocatalytic performance for the degradation of Rhodamine B (50 mg l −1) under UV light irradiation in contrast to morphologies of Gd:MgZrO 3 and other related state-of-the-art photocatalysts (e.g., TiO 2 , ZnO, WO 3 , BiVO 4 , Fe 2 O 3 , and g-C 3 N 4). The catalyst could be used for five cycles, maintaining its efficiency above 94.2%. These capacities made the disc-like Gd:MgZrO 3 a potential candidate for polluted water treatment. Also, the underlying photocatalysis mechanism of Gd:MgZrO 3 was proposed through radical trapping experiments.

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Excellent fabrication of Pd-Ag NPs/PSi photocatalyst based on bimetallic nanoparticles for improving methylene blue photocatalytic degradation

Cited by 53 publications

References 34 publications

The Performance of Plasmonic Gold and Silver Nanoparticle-Based SERS Sensors

The Performance of Plasmonic Gold and Silver Nanoparticle-Based SERS Sensors

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

Solvothermal synthesis of nanoscale disc-like gadolinium doped magnesium zirconate for highly efficient photocatalytic degradation of rhodamine B in water

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