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Synthesis of nanoparticles in an atmospheric pressure glow discharge

Synthesis of metal nanoparticles by dual plasma electrolysis using atmospheric dc glow discharge in contact with liquid

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Synthesis of metal nanoparticles using one atmosphere pressure ..

Usually, for the production of Au nanostructures, the reverse micelles technique (Eastoe et al. ), sonochemical (Okitsu et al. ), chemical (Jana et al. ; Sivaraman et al. ), and photochemical (Lafon et al. ) reduction methods were applied. In contrast to those conventional methods, plasma-based methods were less explored and used for the synthesis of Au NPs (Chen et al. ; Chiang et al. ; Huang et al. ; Mariotti et al. ; Richmonds and Sankaran ; Patel et al. ; Shirai et al. ; Vlad et al. ). Among different plasma systems, atmospheric pressure microdischarge generated between gaseous microjets and different liquid cathodes is established as a very promising method of the synthesis of NPs due to its one-stage character and simplicity, low operational costs, and the lack of toxic by-products (Chiang et al. ; Mariotti et al. ). Unfortunately, all microdischarge systems cited above were working in a non-flowing, stationary mode.

16/05/2012 · Synthesis of metal nanoparticles using one atmosphere pressure ..


N. Shirai, T. Ishida, T. Aoki, S. Uchida, F. Tochikubo "Evaluation of liquid reaction of atmospheric DC glow discharge using liquid electrode and synthesis of metal nanoparticle" PST-14-026

Synthesis of nanoparticles in an atmospheric pressure glow ..

Synthesis of iron oxide nanoparticles in microplasma under atmospheric pressure

The main objective of the present work was to evaluate the suitability of a new direct current atmospheric pressure glow microdischarge (dc-μAPGD) system with a continuous flow of solutions, acting as the liquid cathode of the discharge system, to synthesize Au NPs. In addition, the effect of different stabilizers added to solutions on granulometric properties of resultant Au NPs was compared. HAuCl4 was used as the Au NPs precursor, while gelatin, polyvinylpyrrolidone, and polyvinyl alcohol were applied as capping agents. Optical properties of solutions treated by dc-μAPGD and containing Au NPs were measured using ultraviolet–visible (UV/Vis) absorbance spectroscopy. The morphology and the size of Au NPs were characterized by scanning electron microscopy and dynamic light scattering. Possible reactions taking place in interfacial and liquid zones of the discharge were briefly discussed.

FePt nanoparticle is expected as a candidate for the magnetic material of the high density recording media. We attempted to synthesize FePt alloy nanoparticles using 13.56 MHz glow discharge plasma with the pulse operation of a square-wave on/off cycle of plasma discharge to control the size of nanoparticles. Vapors of metal organics, Biscyclopentadienyl iron (ferrocene) for Fe and (Methylcyclopentadienyl) trimethyl platinum for Pt, were introduced into the capacitively coupled flow-through plasma chamber, which consisted of shower head RF electrode and grounded mesh electrode. Synthesis experiments were conducted at room temperature under the conditions of pressure 0.27 Pa, source gas concentration 0.005 Pa, gas residence time 0.5 s and plasma powers 60 watts. Pulse width for plasma duration was chosen from 0.5 to 30 s and plasma off period was 4 s to each pulse operation. Visual observations during the particle growth showed plasma emission in the bulk region was increased with the particle growth. These were theoretically explained by using the model for both transient particle charging in the plasma and single particle behavior in the stationary plasma as well as assuming the similarity between the negative charged particle and negative gas containing plasma. Synthesized nanoparticles were directly collected onto TEM grid, which was placed just below the grounded mesh electrode in the plasma reactor downstream. TEM pictures showed two kinds of particles in size, one of which was nanometer size and isolated with crystal structures and the other appeared agglomerate of nanometer size particles. The size of agglomerated particle was controlled in the 10–120 nm range by varying the plasma-on time from 0.5 to 30 s, although the nanometer size particles did not change. The composition of FePt alloy particles could be altered by adjusting the source gas feed ratio. Also magnetization of FePt nanoparticles was measured by use of SQUID (superconducting quantum interference device) magnetometry measurements. As-synthesized FePt nanoparticles did not exhibit loop-shape characteristic, which indicated superpamagnetic property. Annealed nanoparticles with the composition of Fe58Pt42 at 650°C in atmospheric hydrogen showed clear hysterisis loop with the coercivity as large as 10 KOe.

Carbon nanotube synthesis in atmospheric pressure glow discharge…

Synthesis of Blue Luminescent Si Nanoparticles Using Atmospheric-Pressure ..

AB - In this paper, we present a large-volume (non-micro) atmospheric pressure glow plasma capable of rapid, large-scale zinc oxide nanocrystal synthesis and deposition (up to 400 μg/min), whereas in the majority of the literature, nanoparticles are synthesized using micro-scale or filamentary plasmas. The reactor is an RF dielectric barrier discharge with a non-uniform gap spacing. This design encourages pre-ionization during the plasma breakdown, making the discharge uniform over a large volume. The produced zinc oxide nanocrystals typically have diameters ranging from 4 to 15 nm and exhibit photoluminescence at ≈550 nm and localized surface plasmon resonance at ≈1900 cm-1 due to oxygen vacancies. The particle size can be tuned to a degree by varying the gas temperature and the precursor mixing ratio.

Nanopowders are produced in a low temperature, non-equilibrium plasma jet (APPJ), which produces a glow discharge at atmospheric pressure, for the first time. Amorphous carbon and iron nanoparticles have been synthesized from Acetylene and Ferrocene/H2, respectively. High generation rates are achieved from the glow discharge at near-ambient temperature (40–80°C), and rise with increasing plasma power and precursor concentration. Fairly narrow particle size distributions are measured with a differential mobility analyzer (DMA) and an aerosol electrometer (AEM), and are centered around 30–35 nm for carbon and 20–25 nm for iron. Particle characteristics analyzed by TEM and EDX reveal amorphous carbon and iron nanoparticles. The Fe particles are highly oxidized on exposure to air. Comparison of the mobility and micrograph diameters reveal that the particles are hardly agglomerated or unagglomerated. This is ascribed to the unipolar charge on particles in the plasma. The generated particle distributions are examined as a function of process parameters.

"An analytical performance of atmospheric pressure glow discharge generated in contact ..
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    Synthesis of magnetic nanoparticles by atmospheric-pressure glow discharge plasma-assisted electrolysis

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Size-controlled synthesis of gold nanoparticles by a …

In this paper, we present a large-volume (non-micro) atmospheric pressure glow plasma capable of rapid, large-scale zinc oxide nanocrystal synthesis and deposition (up to 400 μg/min), whereas in the majority of the literature, nanoparticles are synthesized using micro-scale or filamentary plasmas. The reactor is an RF dielectric barrier discharge with a non-uniform gap spacing. This design encourages pre-ionization during the plasma breakdown, making the discharge uniform over a large volume. The produced zinc oxide nanocrystals typically have diameters ranging from 4 to 15 nm and exhibit photoluminescence at ≈550 nm and localized surface plasmon resonance at ≈1900 cm-1 due to oxygen vacancies. The particle size can be tuned to a degree by varying the gas temperature and the precursor mixing ratio.

Atmospheric-pressure glow plasma synthesis of …

N2 - In this paper, we present a large-volume (non-micro) atmospheric pressure glow plasma capable of rapid, large-scale zinc oxide nanocrystal synthesis and deposition (up to 400 μg/min), whereas in the majority of the literature, nanoparticles are synthesized using micro-scale or filamentary plasmas. The reactor is an RF dielectric barrier discharge with a non-uniform gap spacing. This design encourages pre-ionization during the plasma breakdown, making the discharge uniform over a large volume. The produced zinc oxide nanocrystals typically have diameters ranging from 4 to 15 nm and exhibit photoluminescence at ≈550 nm and localized surface plasmon resonance at ≈1900 cm-1 due to oxygen vacancies. The particle size can be tuned to a degree by varying the gas temperature and the precursor mixing ratio.

Atmospheric-pressure glow plasma synthesis of ..

a) Atmospheric Pressure rf Glow Discharge for Nanocrystal Synthesis
b) Advanced Diagnostics of Atmospheric Pressure Plasma Jets Contacting Surfaces

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