Synthesis of core-shell Fe3O4-Au nanoparticles by electrical exploding wire technique combined with laser pulse shooting

Wasfi, Ahmed S.; Humud, Hammad R.; Fadhil, Noor K.

doi:10.1016/j.optlastec.2018.09.006

Cited by 22 publications

(8 citation statements)

References 28 publications

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“…The particles evaporated during the explosion will condense into the liquid more efficiently than into the surrounding air. The properties of nanoparticles created by EEW rely upon numerous parameters, which include wires' material and diameter, features of the electrical circuit, and the surrounding medium [2].…”

Section: Introductionmentioning

confidence: 99%

Signature of Plasmonic Nanostructures Synthesised by Electrical Exploding Wire Technique on Surface-Enhanced Raman Scattering

Hamzah

Mahmood

2021

eijs

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This work aims to fabricate two types of plasmonic nanostructures by electrical exploding wire (EEW) technique and study the effects of the different morphologies of these nanostructures on the absorption spectra and Surface-Enhanced Raman Scattering (SERS) activities, using Rhodamine 6G as a probe molecule. The structural properties of these nanostructures were examined using X-Ray diffraction (XRD). The morphological properties were examined using field emission scanning electron microscopy (FESEM) and scanning transmission electron microscopy (STEM). The absorption spectra of the mixed R6G laser dye (concentration 1×10-6 M) with prepared nanostructures were examined by double beam UV-Vis Spectrophotometer. The Raman spectra of the R6G mixed with the prepared nanostructures were examined using a Horiba HR Evolution 800 Raman microscope system with an objective lens (50 ×). The FESEM and STEM images indicated that the Ag nanoparticles (AgNPs) with 35 nm average particle sizes were decorated on the surface of the AgNWs and the PDA layer by EEW technique, forming AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures. The results indicated that the increased intensities of the absorption spectra peaks and the SERS arise from the hot spots and the roughness of the surface of nanostructures. The SERS enhancement factor of R6G (1×10-6 M) was reached at 2.3×107 and 2.5×107, at the wave number of 1650 cm-1, for the AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures, respectively, after being excited by (λexc. = 532 nm) laser source. It can be concluded that the AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures were fabricated with an easy and simple way without the need for additional chemical compounds. These nanostructures attained a reliable and sensitive detection and can be utilized in a variety of SERS applications, such as chemical and biological sensors.

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Section: Introductionmentioning

confidence: 99%

Signature of Plasmonic Nanostructures Synthesised by Electrical Exploding Wire Technique on Surface-Enhanced Raman Scattering

Hamzah

Mahmood

2021

eijs

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“…The particles evaporated during the explosion will condense into the liquid more efficiently than surrounding air. Properties of nanoparticles created by EEW rely upon numerous parameters, which include wires' material and diameter, features of the electrical circuit and the surrounding medium [1,2].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Plasmonic Nanostructures Prepared by Electrical Exploding Wire Technique on the Optical Properties of R6G Dye

Hamzah¹,

Humud²

2021

Nano BioMed ENG

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One of the rapidly growing fields of nanotechnology is its manipulation of laser dyes' properties using nanoparticles and nanostructures due to its various applications, ranging from biomedical imaging to green energy. Silver nanoparticles (Ag NPs) of various concentrations and nanostructures with silver nanowire (Ag NW) were prepared using an electrical exploding wire technique (EEW) and was mixed with a fixed concentration of R6G dye. The behavior of energy transfer from the dye molecules (R6G) to nanomaterials (Ag NPs or plasmonic nanostructures) was examined using fluorescence spectra. The experimental results showed that the fluorescence intensity quenched with increasing concentration and density number of Ag NPs. The distance between the dye molecules and the nanostructures was studied, which was found to decrease as the concentration and density number of Ag NPs increased in the mixture. The energy transfer efficiency of nanostructures was compared. It was obtained that nanostructure (Ag NW@PDA@Ag NPs) achieved the best energy transfer efficiency of 85%. Our results indicated that this nanostructure could sense a distance around the metal nanoparticles (≈ 27.2 nm); thus the nanoparticle-based surface energy transfer (NSET) mechanism is dominated rather than Förster resonance energy transfer (FRET) mechanism. This process is affected by concentration increasing of Ag NPs and coated morphology of Ag NWs by polydopamine (PDA) layer decorated by Ag NPs. The findings can be utilized in the large field of bio diagnostics and biochemistry. Regardless of bio-applications, the quenching mechanisms and rates are also of interest for SERS, (dye-sensitized) solar cells or nanooptics. However, we see the best potential in bio-sensing by managing the quenching rate by adjusting the shape or the concentration of nanostructures.

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“…Ultrasonic spray pyrolysis (USP) is a method of nanoparticle synthesis. Compared to other methods (laser ablation [4], nanoemulsion [5], reduction in liquid [3]) it enables the continuous synthesis of nanoparticles and represents a promising method for their industrial production [6]. The existing USP device (Figure 1) [7], which has three temperature zones, allows for the controlled synthesis of metal nanoparticles on a laboratory scale.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of a Side Inlet for H2 Entry into an Ultrasonic Spray Pyrolysis Device

et al. 2021

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An ultrasonic spray pyrolysis (USP) device consists of an evaporation and two reaction zones of equal length, into which an aerosol with a precursor compound enters, and where nanoparticles are formed in the final stage. As part of this research, we simulated the geometry of a side inlet, where the reaction gas (H2) enters into the reaction tube of the device by using numerical methods. Mixing with the carrier gas (N2) occurs at the entry of the H2. In the initial part, we performed a theoretical calculation with a numerical simulation using ANSYS CFX, while the geometries of the basic and studied models were prepared with Solidworks. The inlet geometry of the H2 included a study of the position and radius of the inlet with respect to the reaction tube of the USP device, as well as a study of the angle and diameter of the inlet. In the simulation, we chose the typical flows of both gases (N2, H2) in the range of 5 L/min to 15 L/min. The results show that the best geometry is with the H2 side inlet at the bottom, which the existing USP device does not allow for. Subsequently, temperature was included in the numerical simulation of the basic geometry with selected gas flows; 150 °C was considered in the evaporation zone and 400 °C was considered in the other two zones—as is the case for Au nanoparticle synthesis. In the final part, we performed an experiment on a USP device by selecting for the input parameters those that, theoretically, were the most appropriate—a constant flow of H2 5 L/min and three different N2 flows (5 L/min, 10 L/min, and 15 L/min). The results of this study show that numerical simulations are a suitable tool for studying the H2 flow in a UPS device, as the obtained results are comparable to the results of experimental tests that showed that an increased flow of N2 can prevent the backflow of H2 effectively, and that a redesign of the inlet geometry is needed to ensure proper mixing. Thus, numerical simulations using the ANSYS CFX package can be used to evaluate the optimal geometry for an H2 side inlet properly, so as to reconstruct the current and improve future USP devices.

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Synthesis of core-shell Fe3O4-Au nanoparticles by electrical exploding wire technique combined with laser pulse shooting

Cited by 22 publications

References 28 publications

Signature of Plasmonic Nanostructures Synthesised by Electrical Exploding Wire Technique on Surface-Enhanced Raman Scattering

Signature of Plasmonic Nanostructures Synthesised by Electrical Exploding Wire Technique on Surface-Enhanced Raman Scattering

The Effect of Plasmonic Nanostructures Prepared by Electrical Exploding Wire Technique on the Optical Properties of R6G Dye

Optimisation of a Side Inlet for H2 Entry into an Ultrasonic Spray Pyrolysis Device

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