Atmospheric Pressure Plasma-Treated Carbon Nanowalls’ Surface-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (CNW-SALDI-MS)

Ohta, Takayuki; Ito, Hironori; Ishikawa, Kenji; Kondo, Hiroki; Hiramatsu, Mineo; Hori, Masaru

doi:10.3390/c5030040

Cited by 5 publications

(13 citation statements)

References 58 publications

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“…[Arg + H] + signals were clearly observed in all spectra, regardless of the wall-to-wall distances of the CNWs [35]. Signals corresponding to fragment ions of arginine also appeared at 160, 130, 124, 116, 114, and 112 [32]. The fragment ions of arginine, m/z = 112 and 116, were assigned to [Arg + H-NH 3 -HCOOH] + (or [C 5 H 10 N 3 ] + ) and [Arg + H-CH 5 N 3 ] + (or [C 5 H 10 NO 2 ] + ), respectively [32,36].…”

Section: N-bp-cl Detectionmentioning

confidence: 89%

“…A time-of-flight mass spectrometer system (TOF-MS; Toyama Co., Ltd., Kanagawa, Japan) was used in this experiment [32]. The background pressures of the ionization chamber and the TOF chamber were kept below 10 −7 Pa.…”

Section: Saldi-tof-ms Measurementsmentioning

confidence: 99%

“…The other detection target was arginine (C 6 H 14 N 4 O 2 ; 174 amu), a typical amino acid, to demonstrate the effect of different wall-towall distances of CNWs on biomolecules. L-Arginine (Sigma-Aldrich Co. LLC, St. Louis, USA, A5006) was dissolved in ultrapure water (Milli-Q), and the concentration was adjusted to be 500 mM, which was set higher than in the previous paper to make it easier to measure [32]. The pH of the arginine solution was 10.43.…”

Section: Saldi-tof-ms Measurementsmentioning

confidence: 99%

“…It was also reported in 2017 that some types of metabolites, such as glucose, melamine, dopamine, and acetaminophen, can be detected using SALDI-MS, and the SY was 0.62 when boron-doped CNWs with hydrophobic surfaces were employed as a SALDI substrate [31]. Furthermore, improvements in the efficiency and sensitivity for the desorption/ionization of analytes by surface hydrophilization of CNWs using atmospheric pressure plasma were reported in 2019 [32]. However, this has been limited to the reporting of the measurement of several molecules on CNWs, whereas the laser desorption/ionization mechanism on CNWs has not yet been sufficiently clarified.…”

Section: Introductionmentioning

confidence: 97%

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Effects of Carbon Nanowalls (CNWs) Substrates on Soft Ionization of Low-Molecular-Weight Organic Compounds in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS)

et al. 2021

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Carbon nanowalls (CNWs), which are vertically oriented multi-layer graphene sheets, were employed in surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) measurements to detect low-molecular-weight organic compounds. CNWs substrates with widely different wall-to-wall distances from 142 to 467 nm were synthesized using a radical-injection plasma-enhanced chemical vapor deposition (RI-PECVD) system with nanosecond pulse biasing to a sample stage. When survival yield (SY) values of N-benzylpyridinium chloride (N-BP-Cl) were examined, which is commonly used to evaluate desorption/ionization efficiency, a narrower wall-to-wall distance presented a higher SY value. The highest SY value of 0.97 was realized at 4 mJ/cm2 for the highest-density CNWs with a wall-to-wall distance of 142 nm. The laser desorption/ionization effect of arginine, an amino acid, was also investigated. When CNWs with a narrower wall-to-wall distance were used, the signal-to-noise (SN) ratios of the arginine signals were increased, while the intensity ratios of fragment ions to arginine signals were suppressed. Therefore, the CNWs nanostructures are a powerful tool when used as a SALDI substrate for the highly efficient desorption/ionization of low-molecular-weight biomolecules.

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Section: N-bp-cl Detectionmentioning

confidence: 89%

Section: Saldi-tof-ms Measurementsmentioning

confidence: 99%

Section: Saldi-tof-ms Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Effects of Carbon Nanowalls (CNWs) Substrates on Soft Ionization of Low-Molecular-Weight Organic Compounds in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS)

et al. 2021

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“…Surface Modifications at Ambient Conditions : The high energy electrons, radicals, and reactive species generated in the microplasma can be used for surface modification of materials. It has been reported that the surface properties of CNMs, polymeric films, can be modified by microplasmas‐based treatments. The plasma modification step can further change the optical, electronic, and other properties of materials.…”

Section: Production Of Advanced Nanomaterialsmentioning

confidence: 99%

Microplasmas for Advanced Materials and Devices

et al. 2019

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DavideMariotti is a Professor of Plasma Science and Nanoscale Engineering with Ulster University in UK. He has previously worked internationally in Japan and USA and both in academic and industry. His research encompasses the design and development of innovative plasma-based processes to explore new materials opportunities. Concurrently to a strong application focus in photovoltaics and more broadly in energy applications, his research is also strongly driven by scientific discovery. Kostya (Ken) Ostrikov is aProfessor with Queensland University of Technology, Australia, a Founding Leader of the CSIRO-QUT Joint Sustainable Processes and Devices Laboratory, and Academician of the Academy of Europe and the European Academy of Sciences. His research focuses on nanoscale control of energy and matter contributes to the solution of the grand challenge of directing energy and matter at nanoscales, to develop renewable energy and energy-efficient technologies for a sustainable future.is made on synergistic, complementary features of the plasmas that make them a versatile tool in materials-related applications.We therefore examine the recent progress in microplasmabased synthesis of advanced nanomaterials, highlight the key features of microplasmas, and discuss salient examples of Adv.

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Power Generation Characteristics of Polymer Electrolyte Fuel Cells Using Carbon Nanowalls as Catalyst Support Material

Ohta

Iwata

Hiramatsu

et al. 2022

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We evaluated the power generation characteristics of a polymer electrolyte fuel cell (PEFC) composed of Pt-supported carbon nanowalls (CNWs) and a microporous layer (MPL) of carbon black on carbon paper (CP) as catalyst support materials. CNWs, standing vertically on highly crystallizing graphene sheets, were synthesized on an MPL/CP by plasma-enhanced chemical vapor deposition (PECVD) using inductively coupled plasma (ICP). Pt nanoparticles were supported on the CNW surface using the liquid-phase reduction method. The three types of voltage loss, namely those due to activated polarization, resistance polarization, and diffusion polarization, are discussed for the power generation characteristics of the PEFC using the Pt/CNWs/MPL/CP. The relationship between the height or gap area of the CNWs and the voltage loss of the PEFC is demonstrated, whereby the CNW height increased with the extension of growth time. The three-phase interface area increased with the increase in the CNW height, resulting in mitigation of the loss due to activated polarization. The gap area of the CNWs varied when changing the CH4/H2 gas ratio. The loss due to diffusion polarization was reduced by enlarging the gap area, due to the increased diffusion of fuel gas and discharge of water. The secondary growth of the CNWs caused the three-phase interface area to decrease as a result of platinum aggregation, impedance of the supply of ionomer dispersion solution to the bottom of the CNWs, and inhibition of fuel gas and water diffusion, which led to the loss of activated and diffuse polarizations. The voltage losses can be mitigated by increasing the height of CNWs while avoiding secondary growth.

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Atmospheric Pressure Plasma-Treated Carbon Nanowalls’ Surface-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (CNW-SALDI-MS)

Cited by 5 publications

References 58 publications

Effects of Carbon Nanowalls (CNWs) Substrates on Soft Ionization of Low-Molecular-Weight Organic Compounds in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS)

Effects of Carbon Nanowalls (CNWs) Substrates on Soft Ionization of Low-Molecular-Weight Organic Compounds in Surface-Assisted Laser Desorption/Ionization Mass Spectrometry (SALDI-MS)

Microplasmas for Advanced Materials and Devices

Power Generation Characteristics of Polymer Electrolyte Fuel Cells Using Carbon Nanowalls as Catalyst Support Material

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