Accelerated nanoparticles synthesis in alcohol–water-mixture-based solution plasma

Sudare, Tomohito; Ueno, Tomonaga; Watthanaphanit, Anyarat; Saito, Nagahiro

doi:10.1039/c5cp05168a

Cited by 30 publications

(31 citation statements)

References 39 publications

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“…Several types of liquid-phase plasma, e.g., streamer, spark, arc, and glow discharge plasmas, and their various formation methods have been reported11121314. We have already demonstrated a spark–glow transition plasma in aqueous solution and have used it to fabricate gold nanoparticles in the absence of a reducing agent15161718192021222324. This plasma is named solution plasma.…”

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confidence: 99%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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Although solution-plasma processing enables room-temperature synthesis of nanocarbons, the underlying mechanisms are not well understood. We investigated the routes of solution-plasma-induced nanocarbon formation from hexane, hexadecane, cyclohexane, and benzene. The synthesis rate from benzene was the highest. However, the nanocarbons from linear molecules were more crystalline than those from ring molecules. Linear molecules decomposed into shorter olefins, whereas ring molecules were reconstructed in the plasma. In the saturated ring molecules, C–H dissociation proceeded, followed by conversion into unsaturated ring molecules. However, unsaturated ring molecules were directly polymerized through cation radicals, such as benzene radical cation, and were converted into two- and three-ring molecules at the plasma–solution interface. The nanocarbons from linear molecules were synthesized in plasma from small molecules such as C2 under heat; the obtained products were the same as those obtained via pyrolysis synthesis. Conversely, the nanocarbons obtained from ring molecules were directly synthesized through an intermediate, such as benzene radical cation, at the interface between plasma and solution, resulting in the same products as those obtained via polymerization. These two different reaction fields provide a reasonable explanation for the fastest synthesis rate observed in the case of benzene.

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confidence: 99%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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“…The discharging current increased to a maximum value of ∼6 A and the frequency of current oscillations was 3.7 MHz. These current waveforms and oscillation phenomena in Figure (a) are generally observed in the SP generation using the conventional circuit and pin‐to‐pin discharge device …”

Section: Resuitmentioning

confidence: 58%

“…The conventional circuit consists of a bipolar pulsed power supply and pin‐to‐pin discharge device, as shown in Figure (a) and Supplementary Information Figure S1 . The modified circuit consists of a low‐pass filter part, denoted as the oscillation filter part, with a parallel capacitor of 2 nF and a resistor of 50 Ω and discharge device part with the addition of a resistor of 100 Ω in series, as shown in Figure (b).…”

Section: Methodsmentioning

confidence: 99%

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Generation of non‐equilibrium condition in solution plasma discharge using low‐pass filter circuit

Heo

Lee

Bratescu

et al. 2016

Plasma Processes & Polymers

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Solution plasma process has been researched as one of the synthetic methods of nano‐ and functional materials using plasma discharge in liquids. In this study, a low‐pass filter circuit was introduced to increase the density and temperature of electrons involved in a non‐equilibrium condition. The discharge properties of the solution plasma generated by conventional and low‐pass filter circuits were characterized and comparatively analyzed. Filtration of the MHz range current oscillations, an increase in the maximum discharge current, and a higher stability of solution plasma were obtained by simply inserting a resistor‐capacitor (RC) component in the circuit, which leads to the increases in the density and temperature of electrons.

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“…The H and OH radicals form atomic H, H 2 and H 2 O 2 in aqueous solutions and have different reducing abilities depending on the pH value of the solution. 16,26 Among these products, hydrated electrons have the strongest reducing ability to reduce most of the metal ions in the solution. Due to the extremely short lifetime of these PLI products (10 À9 s to 10 À6 s), 27 the plasma-induced chemical reaction can be terminated immediately without leaving reductant residuals upon removal of the plasma.…”

Section: Plasma-assisted Nanomaterials Synthesismentioning

confidence: 99%

Microfluidic chip for droplet-based AuNP synthesis with dielectric barrier discharge plasma and on-chip mercury ion detection

Lin

2018

RSC Adv.

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This study presents a novel microfluidic chip that can achieve on-demand gold nanoparticle (AuNP) synthesis using atmospheric pressure helium plasma and on-site mercury ion detection. Instead of using conventional chemical reaction methods, this chip uses helium plasma as the reducing agent to reduce gold ions and to synthesize AuNP, such that there is no residual reducing agent in the solution after removing the external electric field for plasma generation. The plasma discharge, gas-liquid separation, liquid collection and mercury ion detection can be achieved by this proposed microfluidic chip. The synthesized gold nanoparticles are further functionalized by 3-mercaptopropionic acid (3-MPA) for mercury ion detection. The 3-MPA-capped gold nanoparticles aggregate and result in a colour change of the solution due to the existence of Hg 2+ . The absorption spectra of the solution shifts from red to blue due to the cluster aggregation. The concentration of Hg 2+ can be quantitatively determined by UVVis spectrometry, and the limit of detection was found to be 10 À6 M (0.2 ppm). This developed integrated microfluidic device provides a simple and on-demand method for synthesis of AuNPs and Hg 2+ detection in a single chip.

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Accelerated nanoparticles synthesis in alcohol–water-mixture-based solution plasma

Cited by 30 publications

References 39 publications

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Generation of non‐equilibrium condition in solution plasma discharge using low‐pass filter circuit

Microfluidic chip for droplet-based AuNP synthesis with dielectric barrier discharge plasma and on-chip mercury ion detection

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