A multi-step treatment to effective purification of single-walled carbon nanotubes

Autor(es)

Montoro, Luciano Andrey ^[1] ; Rosolen, Jose Mauricio ^[2]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo (USP). Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Brasil

^[2] Universidade de São Paulo (USP). Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Carbon; v. 44, n. 15, p. 3293-3301, Dec. 2006.
• Área do conhecimento: Ciências Exatas e da Terra - Química
• Assunto(s): Nanotecnologia Materiais nanoestruturados Carbono Microscopia eletrônica de transmissão Varredura diferencial de calorimetria

Resumo

An efficient procedure for the purification of single-walled carbon nanotubos (SWCNTs) based on chemical treatment and physical separation is proposed and studied step-by-step by high-resolution transmission electron microscopy, thermogravimetric analyses, and nitrogen adsorption techniques. Impure raw samples prepared by the arc-discharge method containing SWCNTs, amorphous carbon, graphitic particles, carbon shells, metallic catalysts, and fullerenes were employed in this study. The procedure reported herein was used to remove each impurity of the sample in a step-by-step way. Gas-phase oxidation and the popular oxidation by heating in nitric acid were avoided to minimize damages to structure of the SWCNTs and to keep eventual chemical modifications of sample to a minimum. This new procedure is efficient and appropriate for the obtention of highly pure SWCNTs with minimal damage to the walls and minimal modification in the length of the tubes. The amount of each kind of impurity present in the raw material yielded in an arc-reactor was quantitatively estimated. Results of specific surface area and t-plots are also discussed. (AU)

• Processo FAPESP: 04/07085-2 - Nanotecnologia de carbono aplicada ao desenvolvimento de sensores, celulas fotovoltaicas, pseudo capacitores e compositos polimericos.
• Beneficiário: Jose Mauricio Rosolen
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 01/01581-0 - Preparação, desenvolvimento e caracterização de nanotubos de carbono e eletrodos compósitos aplicados a baterias de íons lítio
• Beneficiário: Luciano Andrey Montoro
• Modalidade de apoio: Bolsas no Brasil - Doutorado