CARBON NANOTUBES DECORATED WITH COBALT PARTICLES / NANOTUBOS DE CARBONO DECORADOS COM PARTÍCULAS DE COBALTO

AUTOR(ES)

DUNIESKYS ROBERTO GONZALEZ LARRUDE

DATA DE PUBLICAÇÃO

2007

RESUMO

Carbon nanotubes since they are observed for the first time have been attracted attention due to their structure and unique electronic properties. Many applications, as support materials for catalysts, are proposed because of their aspect ration and good electrical conductivity. These properties favor a better dispersion and stabilization of the metallic nanoparticles, increasing the number of catalytic active atoms. In this work, we produced multi- walled carbon nanotubes (MWNT) with good structural properties using the Spray Pyrolysis method. We found the optimum parameters for the growth of high quality MWNT, namely, the gas flux and the concentration of the precursor solution, 1800 sccm and 2,0-2,9 wt %, respectively. The nanotubes were decorated via a chemical route, being the most efficient process the one where the cobalt nitrate was diluted in acetone with the formation of a homogeneous cobalt oxide particles-MWNT powder, with a subsequent reduction in H2 atmosphere at 573K. The structural characterization was performed by a multitechnique approach, including Raman spectroscopy, transmission and scanning electron microscopes (TEM and SEM) and x-ray diffraction (XRD).

ASSUNTO(S)

nanotubos de carbono raman cobalt carbono carbon nanotubes raman nanoparticulas cobalto nanoparticles carbon

Documentos Relacionados

• Deposição eletroforética de nanotubos de carbono
• Purificação e funcionalização de nanotubos de carbono e produção de compósitos de matriz epóxi reforçados com nanotubos de carbono aminados
• AdsorÃÃo de Trihalometanos em Nanotubos de Carbono.
• CARBON NANOTUBES INTERACTING WITH SELENIUM: A SIMULATION OF FIRST PRINCIPLES
• Carbon nanotubes on development of electrochemical sensors