Raman spectroscopy revealing noble gas adsorption on single-walled carbon nanotube bundles

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Cunha, Renato ^{[1, 2, 3]} ; Paupitz, Ricardo ^[4] ; Yoon, Kichul ^[5] ; Van Duin, Adri C. T. ^[5] ; Elias, Ana Laura ^{[1, 2]} ; Carozo, Victor ^{[6, 1, 2]} ; Dasgupta, Archi ^[7] ; Fujisawa, Kazunori ^{[1, 2]} ; Lopez, Nestor Perea ^{[1, 2]} ; Araujo, Paulo T. ^{[8, 9]} ; Terrones, Mauricio ^{[10, 1, 2, 7, 11]}

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^[1] Penn State Univ, Ctr Dimens & Layered Mat 2, University Pk, PA 16802 - USA

^[2] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 - USA

^[3] Univ Fed Para, Fac Ciencias Exatas Nat, Campus Univ Tocantins, BR-68400000 Belem, PA - Brazil

^[4] Univ Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13506900 Rio Claro, SP - Brazil

^[5] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 - USA

^[6] Pontificia Univ Catolica Rio de Janeiro, Dept Phys, BR-22451900 Rio De Janeiro, RJ - Brazil

^[7] Penn State Univ, Dept Chem, University Pk, PA 16802 - USA

^[8] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 - USA

^[9] Univ Alabama, Ctr Mat Informat Technol, MINT Ctr, Tuscaloosa, AL 35487 - USA

^[10] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 - USA

^[11] Shinshu Univ, Inst Carbon Sci & Technol, 4-17-1 Wakasato, Nagano 3808553 - Japan

• Tipo de documento: Artigo Científico
• Fonte: Carbon; v. 127, p. 312-319, FEB 2018.
• Citações Web of Science: 5

Resumo

The interaction of the noble atoms (Ar and Xe) with single-walled carbon nanotube (SWCNT) bundles are investigated using Raman spectroscopy in conjunction with computational modeling known as ReaxFF force field. SWCNT bundles were deposited on transmission electron microscopy (TEM) grids, and different noble gases were adsorbed onto the nanotubes at 20 K. Raman spectra acquired show significant frequency blueshifts of the radial breathing mode (RBM), G-and G'(or 2D)-bands due to gas solidification within the external groove sites (free spaces between the tubes in the bundle) and external surfaces of the bundles. This solid shell formed by the adsorbed gases contributes with a hydrostatic pressure to the system. We show from Raman measurements that the frequencies found after gas adsorption exhibit almost the same shifts indicating that the interactions between SWCNTs bundles and the gases (Ar or Xe) are nearly identical. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/15521-9 - Propriedades estruturais e eletrônicas de sistemas moleculares e bidimensionais
• Beneficiário: Ricardo Paupitz Barbosa dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular