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Obtenção de nanotubos de óxido de cério através de síntese hidrotérmica alcalina livre de templates

Obtaining cerium oxide nanotube by template-free alkaline hydrothermal synthesis

SANTOS, Adriana P. B.; SANTOS, Anne Gabriella D.; COSTA, José Alzamir P.; SOUZA, Luiz D.; ARAÚJO, Antonio S.;

Completo:

Nanotubos constituídos de óxidos de metais têm atraído atenção na última década em virtude de suas propriedades físicas e químicas diferentes das do material de origem. Materiais constituídos de cério mostram características ópticas, eletrônicas e magnéticas interessantes, principalmente devido à presença de elétrons na camada f. Na literatura, as metodologias mais comumente utilizadas para a obtenção de nanotubos de Cério (CeNTs) utilizam templates como direcionadores de estrutura. Este trabalho buscou obter CeNTs por meio de síntese hidrotérmica alcalina, sem a utilização de templates. O material obtido foi caracterizado por TG-DSC, DRX, MEV e Adsorção/Dessorção de N2. Os resultados mostraram a obtenção de um material nanotubular constituído inicialmente de Ce(OH)3 visualizado pelas curvas de TG-DSC. Os difratogramas exibiram um aumento de organização estrutural após a calcinação do nanotubo de Ce(OH)3 e obtenção de nanotubos de CeO2 (CeNTs). A morfologia nanotubular foi confirmada pelas imagens de MEV, mostrando materiais em multicamadas com diâmetros externo médio na faixa de 30-90 nm. As isotermas de Adsorção/Dessorção de N2 obtidas para o CeNTs indicou loop de histerese do tipo C, típica de morfologia nanotubular. Os CeNTs obtidos possuem uma área superficial específica de 60,87 m2/g.

Completo:

Nanotubes made of metal oxides have attracted attention in the last decade due to their physical and chemical properties different from the parent material. Consisting of cerium materials show optical characteristics, electronic and magnetic interesting, mainly due to the presence of electrons in the f layer. In literature, the methods most commonly used for obtaining cerium nanotubes (CeNTs) using template as structure-directing.This study aimed to obtain cerium oxide nanotubes (CeNTs) by alkaline hydrothermal synthesis without the use of templates. The material obtained was characterized by TG-DSC, XRD, SEM and N2 adsorption/desorption. The results showed obtaining a nanotubular materials initially consisting of Ce(OH)3 displayed by the TG-DSC curves. The XRD patterns showed an increase in structural organization of the calcining nanotube after Ce(OH)3 to obtain CeO2 nanotubes. The nanotubular morphology was confirmed by SEM images showing multilayer materials with an average external diameter in the range 30-90 µm. The isotherms adsorption/desorption of N2 obtained for CeNTs hysteresis loop indicated type C typical nanotubular morphology. The CeNTs obtained have a specific surface area of 60.87 m2 / g.

Palavras-chave: Síntese; hidrotermica; óxido de cério; nanotubos,

Palavras-chave: synthesis; hydrothermal; cerium oxide; nanotubes.,

DOI: 10.5151/chenpro-5erq-am31

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Como citar:

SANTOS, Adriana P. B.; SANTOS, Anne Gabriella D.; COSTA, José Alzamir P.; SOUZA, Luiz D.; ARAÚJO, Antonio S.; "Obtenção de nanotubos de óxido de cério através de síntese hidrotérmica alcalina livre de templates", p. 872-881 . In: Anais do V Encontro Regional de Química & IV Encontro Nacional de Química [=Blucher Chemistry Proceedings].. São Paulo: Blucher, 2015.
ISSN 2318-4043, DOI 10.5151/chenpro-5erq-am31

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