Electron-beam engineering of single-walled carbon nanotubes from bilayer graphene |
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| Affiliation: | 1. Group of Electron Microscopy of Materials Science, Central Facility for Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany;2. Department of Chemistry, Ilmenau Technical University, Weimarer Str. 25, 98683 Ilmenau, Germany;3. School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. LMSE Laboratory, University of Bachir Ibrahimi, 34265 Bordj-Bou-Arréridj, Algeria;2. Laboratory of Surface and Interface Studies of Solid Materials, Department of Physics, Faculty of Science, Setif University 1, Setif 19000, Algeria;3. Department of Physics, Faculty of Science, University of M''sila, 28000 M''sila, Algeria;4. Department of Physics, Faculty of Arts and Sciences, Dumlupinar University, Kutahya, Turkey;1. Laboratório de Diagnósticos por DNA, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil;2. Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal;3. Faculdade de Ciências, Universidade do Porto, Portugal;4. Laboratório de Ecologia de Peixes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. A*STAR Institute of High Performance Computing, 1 Fusionopolis Way, Singapore 138632, Singapore;3. International Centre for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China;4. Department of Mechanical Engineering, 6159 Etcheverry Hall, University of California, Berkeley 94720, USA;1. Laboratoire des Composites ThermoStructuraux, Univ. Bordeaux – CNRS – Herakles – CEA, 3 allée de la Boétie, 33600 Pessac, France;2. Institut des Science Moléculaires, Univ. Bordeaux – CNRS, Cours de la libération, 33400 Talence, France;3. MultiScale Material Science for Energy and Environment, CNRS-MIT, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States |
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| Abstract: | Bilayer graphene nanoribbons (BGNRs) with a predefined width have been produced directly from bilayer graphene using a transmission electron microscope (TEM) in scanning mode operated at 300 kV. The BGNRs have been subsequently imaged in high-resolution TEM mode at 80 kV. During imaging, the interaction of the electrons with the sample induces structural transformations in the BGNR, such as closure of the edges and thinning, leading to the formation of a single-walled carbon nanotube (SWCNT). We demonstrate using molecular dynamics simulations that the produced SWCNT is, in fact, a flattened SWCNT with elliptical circumference. Density functional theory calculations show that the band gap of the flattened semiconducting SWCNTs is significantly smaller than that of the undeformed semiconducting SWCNTs, and this effect is particularly profound in narrow SWCNTs. |
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