Raman study of carbon nanotube purification using atmospheric pressure plasma

Lee, Szetsen; Peng, Jr-Wei; Liu, Chih-Hung

doi:10.1016/j.carbon.2008.09.029

Cited by 37 publications

(29 citation statements)

References 36 publications

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“…2 shows the case of F moist = 20 sccm over a wide voltage range from shortly after plasma ignition to the point where the plasma becomes unstable with a significant temperature rise. The peak discharge current is in the range of 2 -10 mA, clearly less than those of the Ar-H 2 O plasma jets (>50mA) [46] [47] and much lower than those of traditional nonthermal liquid-containing plasmas (1 -1000 A) [3] [9]. This comparison remains true for the current density also, and so the He-H 2 O plasma jet of Fig.…”

Section: Electrical Characterization and Plasma Modesmentioning

confidence: 50%

“…Therefore the energy consumption of the atmospheric He-H 2 O plasma jet is at most 2 -200 J per pulse, some 4 -6 orders of magnitude below that of the liquid-containing corona discharges and 7 -10 orders below of the liquid-containing pulsed arcs [3]. In its bullet mode, the energy consumption of the He-H 2 O plasma is slightly less than 5 -35 J per pulse estimated for the 71 kHz Ar-H 2 O plasma jet [47] and comparable to 5 J per half cycle estimated for the 13.56 MHz Ar-H 2 O plasma jet [46]. These plasma jets represent a relatively new class of low-energy atmospheric liquid-containing plasmas appropriate for low-temperature applications.…”

Section: Electrical Characterization and Plasma Modesmentioning

confidence: 78%

“…Its value is nevertheless 145K above the rotational temperature in the bullet mode and is well above 60 o C thus inappropriate for treatment of living tissues. Yet it is still considerably below those observed in Ar-H 2 O plasma jets of 620 -1,125 K [46] [47]. Even with comparable energy consumption of 2 -35 J per pulse, this low gas temperature in the helium plasma is not surprising because of the better thermal conductivity of helium.…”

Section: Plasma Temperatures and Electron Densitymentioning

confidence: 81%

“…It is worth noting that similar setup to that in Fig. 1 has been used in studies of atmospheric Ar-H 2 O plasma jets excited at 13.56 MHz [46] and at 71 kHz [47] with rotational temperature being 1,100K and 620 -1,125K, respectively. These argon plasmas have much greater gas temperature than 60 o C and as such are more appropriate to applications for which high gas temperature is not hindering.…”

Section: Methodsmentioning

confidence: 99%

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Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Liu¹,

Kong²

2011

J. Phys. D: Appl. Phys.

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To cite this version:J J Liu, M G Kong. Sub-60°C atmospheric heliumwater plasma jets: modes, electron heating and downstream reaction chemistry. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (34) AbstractFor plasma treatment of many heat labile materials (e.g. living tissues) that are either moist or contain a surface layer of liquid, it is desirable that the gas plasma is generated at atmospheric pressure for process convenience and with a gas temperature ideally no more than 60 o C for mitigating permanent damage to the integrity of the test material. This implies that the liquid-containing plasma needs to be of low energy and that plasma treatment should be based largely on non-equilibrium reaction chemistry. In this contribution, a class of sub-60 o C atmospheric helium-water plasma jets is studied in terms of their main physiochemical properties. It is shown that there are five distinct modes appearing in the sequence of, with increasing voltage, the first chaotic mode, the plasma bullet mode, the second chaotic mode, the abnormal glow mode, and the nonthermal arc mode. Its chaotic modes may be sustained over a wide range of water vapour concentration (0 -2,500ppm). Compared to other liquid-containing plasmas, the He-H 2 O plasma jet operated below its nonthermal arc mode has several distinct advantages, namely very low energy consumption (2 -10 J per pulse), sub-60 o C gas temperature,

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Section: Electrical Characterization and Plasma Modesmentioning

confidence: 50%

Section: Electrical Characterization and Plasma Modesmentioning

confidence: 78%

Section: Plasma Temperatures and Electron Densitymentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Liu¹,

Kong²

2011

J. Phys. D: Appl. Phys.

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“…The D / G values were 1.1488 and 1.2815 for pristine and purified CN x , respectively. This increasing in D / G ratio has been suggested as an evidence for sidewall functionalization of CNTs [18,19]. With respect to chemical composition of our CN x (pristine and purified), EDX analysis was carried out.…”

Section: Statisticsmentioning

confidence: 99%

Effects of Nitrogen‐Doped Multiwall Carbon Nanotubes on Murine Fibroblasts

Munguia-Lopez

Muñoz‐Sandoval

Ortiz‐Medina

et al. 2015

Journal of Nanomaterials

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The effect of nitrogen-doped multiwall carbon nanotubes (CN x ) on the proliferation of NIH-3T3 murine fibroblasts is presented. CNTs were dispersed in distillated water and incubated with mammalian cells in order to evaluate their toxicity. Also, the influence of factors such as dosage (7 and 70 g/mL), exposure time (24 to 96 h), and the exposure route (before and after cell liftoff) on the cell proliferation was evaluated. When the CN x were simultaneously incubated with the cells, the control culture reached a maximum cell concentration of 1.3 × 10 5 ± 3.4 × 10 4 cells per well at 96 h, whereas cultures with 7 g/mL reached a concentration of 2.6 × 10 4 ± 5.3 × 10 3 cells. In the case of 70 g/mL of CN x most of the cells were dead. The CN x that were added 24 h after cell dissociation showed that live cells decreased, with a cell concentration of 9.6 × 10 4 ± 9 × 10 3 for 7 g/mL and 5.5 × 10 4 ± 9.5 × 10 3 for 70 g/mL, in contrast to control cultures with 1.1 × 10 6 ± 1.5 × 10 4 . The results showed that the CN x had cytotoxic effects depending on the concentration and exposure route.

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Carbon‐Electrode‐Tailored All‐Inorganic Perovskite Solar Cells To Harvest Solar and Water‐Vapor Energy

Duan

Zhao

et al. 2018

Angewandte Chemie

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Moisture is the worst enemy for state-of-the-art perovskite solar cells (PSCs). However,t he flowing water vapor within nanoporous carbonaceous materials can create potentials.Therefore,itisachallenge to integrate water vapor and solar energies into as ingle PSC device.W ed emonstrate herein all-inorganic cesium lead bromide (CsPbBr 3 )solar cells tailored with carbon electrodes to simultaneously harvest solar and water-vapor energy.U pon interfacial modification and plasma treatment, the bifunctional PSCs yield am aximum power conversion efficiency up to 9.43 %u nder one sun irradiation according to photoelectric conversion principle and apower output of 0.158 mWwith voltage of 0.35 Vand current of 0.45 mAi n8 0% relative humidity through the flowing potentials at the carbon/water interface.The initial efficiency is only reduced by 2% on exposing the inorganic PSC with 80 % humidity over 40 days.T he successful realization of physical proof-of-concept multi-energy integrated solar cells provides new opportunities of maximizing overall power output.

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Raman study of carbon nanotube purification using atmospheric pressure plasma

Cited by 37 publications

References 36 publications

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Sub-60 °C atmospheric helium–water plasma jets: modes, electron heating and downstream reaction chemistry

Effects of Nitrogen‐Doped Multiwall Carbon Nanotubes on Murine Fibroblasts

Carbon‐Electrode‐Tailored All‐Inorganic Perovskite Solar Cells To Harvest Solar and Water‐Vapor Energy

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