Localized surface grafting reactions on carbon nanofibers induced by gamma and e-beam irradiation

Autor(es)

Evora, M. C. ^[1] ; Araujo, J. R. ^[2] ; Ferreira, E. H. M. ^[2] ; Strohmeier, B. R. ^[3] ; Silva, L. G. A. ^[4] ; Achete, C. A. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Adv Studies IEAV DCTA, BR-12228001 Sao Jose Dos Campos, SP - Brazil

^[2] Inst Nacl Metrol Qualidade & Tecnol, BR-25250020 Duque De Caxias, RJ - Brazil

^[3] Thermo Fisher Sci, Madison, WI 53711 - USA

^[4] Inst Nucl & Energy Res IPEN, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 335, p. 78-84, APR 30 2015.
• Citações Web of Science: 8

Resumo

Electron beam and gamma-ray irradiation have potential application to modify the carbon fiber nanostructures in order to produce useful defects in the graphitic structure and create reactive sites. In this study, the methodology to functionalize carbon nanofiber (CNF), via a radiation process and using acrylic acid as a source of oxygen functional groups, was investigated. The samples were submitted to a direct grafting radiation process with electron beam and gamma-ray source. Several parameters were changed such as: acrylic acid concentration, radiation dose and percentage of inhibitor necessary to achieve functionalization, with higher percentage of oxygen functional groups on CNF surface, and better dispersion. The better results achieved were when mixing CNF in a solution of acrylic acid with 6% of inhibitor (FeSO4 center dot 7H(2)O) and irradiated at 100 kGy. The samples were characterized by X-ray photoelectron spectroscopy and the surface composition (atomic%) showed a significant increase of oxygen content for the samples after irradiation. Also, the dispersion of the functionalized CNF in water was stable during months which may be a good indication that the functionalization process of CNF via ionizing radiation was successful. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/12510-8 - Funcionalização da nanofibra de carbono por enxertia induzida via radiação ionizante
• Beneficiário: Maria Cecilia Conceicao Evora
• Modalidade de apoio: Auxílio à Pesquisa - Regular