Systematic diagnostics of the electrical, optical, and physicochemical characteristics of low-temperature atmospheric-pressure helium plasma sources

Takeda, Keigo; Ishikawa, Kenji; Sakakita, Hajime; Kim, Jae-Ho; Ueda, Masashi; Ikeda, Jun; Akimoto, Yoshihiro; Kataoka, Yosky; Yokoyama, Naoki; Ikehara, Yuzuru; Hori, Masaru

doi:10.1088/1361-6463/aaff44

Cited by 23 publications

(33 citation statements)

References 105 publications

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“…During the 10th discharge cycle, the maximum value of electron density obtained by both 1D (Figure S9a) and 2D plasma models is ∼3 × 10 10 m –3 . Both 1D and 2D maximum electron densities are lower than the reported atmospheric DBD helium plasma electron density magnitude (range from 10 14 to 10 20 m –3 ). ,− One main reason is that the power supply voltage amplitude of our device is much lower than the reported values (0.9 kV vs more than 10 kV). Another reason is that our device has a larger discharge gap (5 mm).…”

Section: Resultsmentioning

confidence: 55%

Colorimetric Signal Readout for the Detection of Volatile Organic Compounds Using a Printable Glass-Based Dielectric Barrier Discharge-Type Helium Plasma Detector

et al. 2023

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In this paper, we report on a printable glass-based manufacturing method and a new proof-of-concept colorimetric signal readout scheme for a dielectric barrier discharge (DBD)-type helium plasma photoionization detector. The sensor consists of a millimeter-sized glass chamber manufactured using a printable glass suspension. Plasma inside the chip is generated using a custom-built power supply (900 V and 83.6 kHz), and the detector uses ∼5 W of power. Our new detection scheme is based on detecting the change in the color of plasma after the introduction of target gases. The change in color is first captured by a smartphone camera as a video output. The recorded video is then processed and converted to an image light intensity vs retention time plot (gas chromatogram) using three standard color space models (red, green, blue (RGB), hue, saturation, lightness (HSL), and hue, saturation, value (HSV)) with RGB performing the best among the three models. We successfully detected three different categories of volatile organic compounds using our new detection scheme and a 30-m-long gas chromatography column: (1) straight-chain alkanes (n-pentane, n-hexane, n-heptane, n-octane, and n-nonane), (2) aromatics (benzene, toluene, and ethylbenzene), and (3) polar compounds (acetone, ethanol, and dichloromethane). The best limit of detection of 10 ng was achieved for benzene at room temperature. Additionally, the device showed excellent performance for different types of sample mixtures consisting of three and five compounds. Our new detector readout method combined with our ability to print complex glass structures provides a new research avenue to analyze complex gas mixtures and their components.

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Section: Resultsmentioning

confidence: 55%

Colorimetric Signal Readout for the Detection of Volatile Organic Compounds Using a Printable Glass-Based Dielectric Barrier Discharge-Type Helium Plasma Detector

et al. 2023

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“…The structure of the helium plasma jet system in detail can be found elsewhere. [24][25][26][27] Here, we briefly describe the setup. The helium plasma was produced by an electrode on a quartz tube of 1.4 mm in inner diameter.…”

Section: Methodsmentioning

confidence: 99%

Albumin aggregation using low-temperature atmospheric pressure helium plasma jet in argon and air atmosphere

Shimizu

Fukui

Sakakita

2022

Jpn. J. Appl. Phys.

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A mechanism of albumin aggregation using low-temperature atmospheric pressure helium plasma jet was investigated. This aggregation is one of the most dominant processes in the plasma-induced hemostasis. Using a chamber where air and argon can be used as surrounding gas, a role of reactive nitrogen species on the aggregation of albumin was tested. By changing surrounding gas, it is possible to control the production of reactive species. The experimental results show that the stability of plasma discharge seems more important for the aggregation of albumin than the presence of reactive nitrogen species. Moreover, it was shown that long lifetime species in the solution and exposure of UV light do not play a major role on the aggregation.

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“…Besides, the electrons and ions attached and accumulated on the membrane of cell, finally causing punctures. Moreover, the reactive oxidizing agents (e.g., ROS and RNS) produced in Journal of Spectroscopy APPJ [39] could react with and damage the cell or the contents. All these factors contributed to the sterilization.…”

Section: Sterilization Using He-appjmentioning

confidence: 99%

He-Plasma Jet Generation and Its Application for E. coli Sterilization

Liu

Zeng

Xue

et al. 2021

Journal of Spectroscopy

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Atmospheric pressure plasma jet (APPJ) is a promising technique for the sterilization of pathogenic microorganisms in an ambient environment. In this work, a helium-APPJ was generated by double dielectric barrier discharge and applied to the sterilization of model microorganism in air and water. Discharge characteristics (including waveform and frequency of applied voltage), jet properties (such as feed gas flow rate, jet length, thermal effect, and optic emission spectra), and sterilization performance (in terms of clear/sterilized area, size of plaques, and sterilization efficiency) were investigated. Homogeneous helium plasma jet was generated in an energy-efficient way (18 kHz, 6 kV, 0.08 W) with a 19 mm jet and limited heating. The He-APPJ achieved good sterilization performances within very short treatment time (as short as 30 s). For surface sterilization, the area of clear zone and size of the plaque were 1809 mm2 and 48 mm, respectively, within 5 min treatment. For water sterilization, 99.8% sterilization efficiency was achieved within 5 min treatment. The optic emission spectra suggest that active species such as excited molecules, ions, and radicals were produced in the He-APPJ. The as-produced active species played important roles in the sterilization process.

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Systematic diagnostics of the electrical, optical, and physicochemical characteristics of low-temperature atmospheric-pressure helium plasma sources

Cited by 23 publications

References 105 publications

Colorimetric Signal Readout for the Detection of Volatile Organic Compounds Using a Printable Glass-Based Dielectric Barrier Discharge-Type Helium Plasma Detector

Colorimetric Signal Readout for the Detection of Volatile Organic Compounds Using a Printable Glass-Based Dielectric Barrier Discharge-Type Helium Plasma Detector

Albumin aggregation using low-temperature atmospheric pressure helium plasma jet in argon and air atmosphere

He-Plasma Jet Generation and Its Application for E. coli Sterilization

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