Reaction science of layer-by-layer thinning of graphene with oxygen neutrals at room temperature

Sugiura, Hirotsugu; Kondo, Hiroki; Higuchi, Kenichi; Arai, Shigeo; Hamaji, Ryo; Tsutsumi, Takayoshi; Ishikawa, Kenji; Hori, Masaru

doi:10.1016/j.carbon.2020.07.052

Cited by 8 publications

(1 citation statement)

References 40 publications

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“…In particular, coalbed methane reserves and extraction had been studied by scholars from the perspective of coal pore through the properties of coal [17], ambient temperature [13], gas pressure [18], etc. With the improvement of computer technology and the popularization of molecular simulation software, the adsorption behavior of single or multiple gases [19][20][21] in coal pores had been analyzed by many researchers through the Grand Canonical Monte Carlo (GCMC) [22,23] and Density Flood Theory (DFT) methods [24,25] used Materials studio [26],…”

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confidence: 99%

O2 Physisorption in Coal Pore: Effects of Pore Size, Pressure, Temperature and Function Group

Cheng

Tan

et al. 2022

Preprint

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In this paper, the physical adsorption characteristics of oxygen in coal pores were systematically investigated by the Grand Canonical Monte Carlo and the COMPASS force field. Firstly, coal pore structures of different sizes were constructed by graphite slit models and different groups. Secondly, the physisorption behavior of oxygen in graphite slit models of different sizes was simulated. Finally, the physisorption behavior of oxygen in graphite slit models at different pressures and temperatures was analyzed. The results showed that the physisorption density and excess physical adsorption of oxygen were divided into the rapidly decreasing stage (0.4-0.7 nm), the slowly decreasing stage (0.7-1.4 nm), and the stable stage (1.4 nm-5 nm) with the increase of coal pores, and the excess oxygen physisorption amount was more sensitive to the change of pressure. The O2 isosteric heat of physisorption decreased with increasing pore size of coal. Oxygen is more strongly adsorbed by hydroxyl and ether bonds than by methyl, carboxyl and carbonyl groups. Through this study, the mechanism of oxygen physical adsorption in coal pores and the characteristics influenced by temperature and pressure can be better understood.

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confidence: 99%

O2 Physisorption in Coal Pore: Effects of Pore Size, Pressure, Temperature and Function Group

Cheng

Tan

et al. 2022

Preprint

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Nanoporous Single‐Layer Graphene Membranes for Gas Separation

Bondaz

Huang

Rezaei

et al. 2022

Two‐Dimensional‐Materials‐Based Membranes

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Radical-controlled plasma processes

Hori

2022

Rev. Mod. Plasma Phys.

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In plasmas, a variety of radicals which are defined as electrically neutral radicals in this article are efficiently produced by collisions between electrons and gas molecules. These radicals can subsequently undergo gas phase reactions with solids, liquids and living organisms that result in non-equilibrium surface/interface physicochemical processes. The specific phenomena produced by these reactions remain largely unknown, even though these plasma-based processes could lead to disruptive technological innovations. As an example, in the case of semiconductor microfabrication processes, the density, energy and lifetime of individual radicals, as well as the reaction time constants of these species with various materials should be ascertained. This would allow the identification and control of the effective radical species during processes, such as the high-precision etching and deposition of functional thin films. In addition, the type of reactions occurring between radicals generated in plasmas with liquids or living organisms is still an unexplored area. Establishing a theoretical system for these radical reactions and controlling the associated mechanisms could lead to innovations in the fields of functional devices and materials as well as in the areas of environmental protection, medicine and agriculture/fisheries. Focusing on the non-equilibrium surface/interface physicochemical reactions between radicals and solids occurring in semiconductor plasma processing, this paper describes the formation of nanostructured thin films by top-down mechanisms based on controlled radical production and bottom-up processes involving radical-induced self-organization. As well, this review examines next-generation medical and agricultural applications, such as the selective killing of cancer cells and plant growth promotion and functionalization. These systems result from the interactions of radicals generated in atmospheric-pressure, low-temperature plasmas with liquids, or the interactions of gas or liquid phase radicals with biological species. Finally, the importance of academic research into radical-controlled plasma processes and potential future technologies based on this interdisciplinary field are examined.

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Reaction science of layer-by-layer thinning of graphene with oxygen neutrals at room temperature

Cited by 8 publications

References 40 publications

O2 Physisorption in Coal Pore: Effects of Pore Size, Pressure, Temperature and Function Group

O2 Physisorption in Coal Pore: Effects of Pore Size, Pressure, Temperature and Function Group

Nanoporous Single‐Layer Graphene Membranes for Gas Separation

Radical-controlled plasma processes

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