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Nieman R, Aquino AJA, Lischka H. Exploration of Graphene Defect Reactivity toward a Hydrogen Radical Utilizing a Preactivated Circumcoronene Model. J Phys Chem A 2021; 125:1152-1165. [PMID: 33507752 DOI: 10.1021/acs.jpca.0c09255] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A preexisting chemisorbed defect is well-known to increase the reactivity of graphene which is normally chemically inert. Specifically, the presence of chemisorbed hydrogen atoms forming an sp3-hybridized C-H bond is known to increase the reactivity of neighboring carbon atoms toward additional hydrogenation with wide-ranging applications from materials science to astrochemistry. In this work, static DFT and DFT-based direct dynamics simulations are used to characterize the reactivity of a graphene sheet around an existing C-H bond defect. The spin density landscape shows how to guide subsequent H atom additions, always bonding most strongly to the carbon atom with greatest spin density. Molecular dynamics of an impinging H atom under thermal conditions with defect graphene was used to determine the statistics of probable reactions. The most frequent outcome is inelastic scattering (48%) and then Eley-Rideal (ER) abstraction of the chemisorbed H atom as vibrationally hot H2 (40%), while the least likely, but probably most interesting, result is formation of a novel C-H bond (12%). The C-H bonds always form in the β sublattice. The carbon atom in the para position shows to be most reactive toward the incoming H atom, followed by the ortho carbon, in agreement with the spin density computed in the static calculations. Globally, the graphene energy surface is repulsive, but the defects create local channels into this energy surface through which reactants can move locally through and react with the activated surface without a barrier.
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Affiliation(s)
- Reed Nieman
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States.,Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Adelia J A Aquino
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, United States.,School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States.,School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
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Sánchez M, Ruette F. Calculations of adsorption, coadsorption, diffusion, and reaction barriers of H atoms in the H2 formation on a positively charged coronene. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kayanuma M, Shoji M, Furuya K, Kamiya K, Aikawa Y, Umemura M, Shigeta Y. First-Principles Study of the Reaction Mechanism of CHO + H on Graphene Surface. J Phys Chem A 2019; 123:5633-5639. [PMID: 31244121 DOI: 10.1021/acs.jpca.9b02345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many organic molecules observed in the interstellar medium are considered to be formed on dust grains and populated into the gas phase. We analyzed the reaction of HCO + H on a graphene surface using ab initio molecular dynamics simulations as a case study of the formation and desorption of organic molecules on interstellar dust particles. During the reactions of chemisorbed CHO (chemisorbed at the C atom) with free H, CO was generated and efficiently desorbed from the surface. These results suggest that the reactions, of which the reactant forms a covalent bond with the surface while the product does not, cause efficient desorption of the product upon reaction. In such reactions a repulsive force between the product and the surface would be generated and accelerate translation of the product in a specific direction. In addition, it was also shown that the branching ratio of the reactions between radical species on the surface would be affected by the form of the adsorption on the surface, e.g., when a free H reacted with the CHO chemisorbed at the C atom, CH2O was not generated.
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Affiliation(s)
- Megumi Kayanuma
- Research Center for Computational Design of Advanced Functional Materials , National Institute of Advanced Industrial Science and Technology , Central 2, 1-1-1 Umezono , Tsukuba , Ibaraki 305-8568 , Japan.,Center for Computational Sciences , University of Tsukuba , 1-1-1 Tennodai , Tsukuba , Ibaraki 305-8577 , Japan
| | - Mitsuo Shoji
- Center for Computational Sciences , University of Tsukuba , 1-1-1 Tennodai , Tsukuba , Ibaraki 305-8577 , Japan
| | - Kenji Furuya
- Center for Computational Sciences , University of Tsukuba , 1-1-1 Tennodai , Tsukuba , Ibaraki 305-8577 , Japan
| | - Katsumasa Kamiya
- Center for Basic Education and Integrated Learning , Kanagawa Institute of Technology , 1030 Shimoogino , Atsugi , Kanagawa 243-0292 , Japan
| | - Yuri Aikawa
- Department of Astronomy , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
| | - Masayuki Umemura
- Center for Computational Sciences , University of Tsukuba , 1-1-1 Tennodai , Tsukuba , Ibaraki 305-8577 , Japan
| | - Yasuteru Shigeta
- Center for Computational Sciences , University of Tsukuba , 1-1-1 Tennodai , Tsukuba , Ibaraki 305-8577 , Japan.,Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency , 3-1-1 Yoshinodai, Chuo-ku , Sagamihara , Kanagawa 252-0222 , Japan
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4
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Affiliation(s)
- Gianfranco Vidali
- Syracuse University , 201 Physics Building, Syracuse, New York 13244, United States
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Jiménez-Redondo M, Carrasco E, Herrero VJ, Tanarro I. Isotopic exchange processes in cold plasmas of H2/D2 mixtures. Phys Chem Chem Phys 2011; 13:9655-66. [DOI: 10.1039/c1cp20426b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bachellerie D, Sizun M, Aguillon F, Sidis V. Effects of a Nonrigid Graphene Surface on the LH Associative Desorption of H Atoms and on the Deexcitation of Nascent H2 Molecules Colliding with Model Walls of Carbonaceous Porous Material. J Phys Chem A 2008; 113:108-17. [DOI: 10.1021/jp808082b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Bachellerie
- Université Paris-Sud, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France, and CNRS, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France
| | - M. Sizun
- Université Paris-Sud, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France, and CNRS, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France
| | - F. Aguillon
- Université Paris-Sud, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France, and CNRS, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France
| | - V. Sidis
- Université Paris-Sud, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France, and CNRS, Laboratoire des Collisions Atomiques et Moléculaires, UMR8625, Orsay, F-91405, France
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