Au@Ag core/shell nanoparticles prepared by laser‐assisted method for optical limiting applications

Mostafa, Ayman M.; Mwafy, Eman A.; Awwad, Nasser S.; Ibrahium, Hala A.

doi:10.1007/s10854-021-06028-9

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…In most of the papers that were done for the synthesis of MNPs and BNPs by the PLAL method, NPs were synthesized using the rst harmonic generation of the Nd:YAG laser [41][45-50]. In other research apart from the use of the rst and second harmonics generation, the laser parameters such as repetition rate, pulse uence and pulse duration are variable [51][52][53]. Research conducted by Nikov et.al.…”

Section: Sample (#)mentioning

confidence: 99%

“…In other study, PLAL was combined by green synthesis to formation bimetallic structures [50]. In the search carried out by Ayman et.al., the selected pulse uence is greater than our parameter [51]. In addition, in our current study with the pulse uency about 0.5 J/cm2 and applies only one method (PLAL) to the synthesis of the bimetallic system, can form BNPs with various structures (alloy and coreshell) and sizes [42].…”

Section: Sample (#)mentioning

confidence: 99%

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Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Dorranian

2023

Preprint

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The main purpose of this experimental research is to study the effects of different silver concentrations on the optical properties of bimetallic Agshell/Aucore nanoparticles. The gold nanoparticles are ablated by the PLAL technique of the gold target on the bottom of the container. The container is filled with colloidal silver nanoparticles and manufactured by chemical reduction. The colloidal solution of mixed nanoparticles is irradiated by the second harmonic of the pulsed laser Nd:YAG laser at 532 nm wavelength. The peak absorption of gold nanoparticles around 530 nm is used to transfer laser energy to nanoparticles and synthesis the Agshell/Aucore bimetallic nanoparticles. The volumetric ratio of nanoparticle solutions are the experimental variables. Bimetallic nanoparticles are distinguished by the following: X-ray diffraction pattern (XRD), spectroscopy in the range of UV-Vis-NIR and IR, Dynamic light scattering (DLS), Energy Dispersive Spectroscopy (EDS), Photoluminescence spectrum (PL) and, Fourier transform infrared spectroscopy (FT-IR). In addition, FE-SEM and TEM images are used to investigate nanoparticle size and morphology. One of the objectives of this research is the preparation of stable bimetallic systems and the study of optical properties, in order to check the reactivity of silver nanoparticles in the bimetallic system. Moreover, the shell thickness and catalytic properties of bimetallic structure with a different silver concentration is discussed. The following, dipole mode is shown in the visible area for every samples and quadrupole mode is not detected in sample with high silver concentration.

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Section: Sample (#)mentioning

confidence: 99%

Section: Sample (#)mentioning

confidence: 99%

Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Dorranian

2023

Preprint

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“…In addition, compared to other transition metals, Ag is a cheap, non-toxic, superior electrical and high thermal conductor. The main reason for choosing ZnO doped with Ag is because it improves the characteristics and hinders the trapping of photo-generated electrons, which lengthens the lifespan of charge-separated states [ 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Ag/ZnO Thin Film Nanocomposite Membrane Prepared by Laser-Assisted Method for Catalytic Degradation of 4-Nitrophenol

et al. 2022

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Zinc oxide thin film (ZnO thin film) and a silver-doped zinc oxide nanocomposite thin film (Ag/ZnO thin film) were prepared by the technique of the pulsed laser deposition at 600 °C to be applicable as a portable catalytic material for the removal of 4-nitrophenol. The nanocomposite was prepared by making the deposition of the two targets (Zn and Ag), and it was analyzed by different techniques. According to the XRD pattern, the hexagonal wurtzite crystalline form of Ag-doped ZnO NPs suggested that the samples were polycrystalline. Additionally, the shifting of the diffraction peaks to the higher angles, which denotes that doping reduces the crystallite size, illustrated the typical effect of the dopant Ag nanostructure on the ZnO thin film, which has an ionic radius less than the host cation. From SEM images, Ag-doping drastically altered the morphological characteristics and reduced the aggregation. Additionally, its energy band gap decreased when Ag was incorporated. UV spectroscopy was then used to monitor the catalysis process, and Ag/ZnO thin films had a larger first-order rate constant of the catalytic reaction K than that of ZnO thin film. According to the catalytic experiment results, the Ag/ZnO thin film has remarkable potential for use in environmentally-favorable applications.

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“…Noble metals, such as silver (Ag), have been favored for the doping of ZnO because of their high reduction potential and improved photo-degradation capabilities. Because of its high reduction potential, doping of ZnO with Ag is best suited for preventing the recombination of charge carriers by trapping photo-excited electrons from the conduction band (CB), increasing the number of species that react with the pollutant and destroy it [14,[22][23][24]. Furthermore, the nanocomposite faced another problem that came from the hindered aggregation effect that was produced by the high amounts of the nanostructured materials, leading to a decrease in the dangling bonds and reactivity, consequently reducing the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance Improvement by Doping Ag on ZnO/MWCNTs Nanocomposite Prepared with Pulsed Laser Ablation Method Based Photocatalysts Degrading Rhodamine B Organic Pollutant Dye

et al. 2022

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ZnO/MWCNTs nanocomposite has significant potential in photocatalytic and environmental treatment. Unfortunately, its photocatalytic efficacy is not high enough due to its poor light absorbance and quick recombination of photo-generated carriers, which might be improved by incorporation with noble metal nanoparticles. Herein, Ag-doped ZnO/MWCNTs nanocomposite was prepared using a pulsed laser ablation approach in the liquid media and examined as a degradable catalyst for Rhodamine B. (RhB). Different techniques were used to confirm the formation of the nanostructured materials (ZnO and Ag) and the complete interaction between them and MWCNTs. X-ray diffraction pattern revealed the hexagonal wurtzite crystal structure of ZnO and Ag. Additionally, UV-visible absorption spectrum was used to study the change throughout the shift in the transition energies, which affected the photocatalytic degradation. Furthermore, the morphological investigation by a scanning electron microscope showed the successful embedding and decoration of ZnO and Ag on the outer surface of CNTs. Moreover, the oxidation state of the formed final nanocomposite was investigated via an X-ray photoelectron spectrometer. After that, the photocatalytic degradations of RhB were tested using the prepared catalysts. The results showed that utilizing Ag significantly impacted the photo degradation of RhB by lowering the charge carrier recombination, leading to 95% photocatalytic degradation after 12 min. The enhanced photocatalytic performance of the produced nanocomposite was attributed to the role of the Ag dopant in generating more active oxygen species. Moreover, the impacts of the catalyst amount, pH level, and contact time were discussed.

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Au@Ag core/shell nanoparticles prepared by laser‐assisted method for optical limiting applications

Cited by 17 publications

References 32 publications

Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Formation of Agshell/Aucore Bimetallic Nanoparticles by Pulsed Laser Ablation and Chemical Reduction Methods: The Effect Green Laser Wavelength and Colloidal/Solution Concentration

Ag/ZnO Thin Film Nanocomposite Membrane Prepared by Laser-Assisted Method for Catalytic Degradation of 4-Nitrophenol

Photocatalytic Performance Improvement by Doping Ag on ZnO/MWCNTs Nanocomposite Prepared with Pulsed Laser Ablation Method Based Photocatalysts Degrading Rhodamine B Organic Pollutant Dye

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