Synthesis, structural and morphological characterization of vanadium oxide / n-amine nanotubes

M.E. SALETA; M. GRANADA; H.E. TROIANI; R.D. SÁNCHEZ; M. MALTA; R.M. TORRESI

Río de Janeiro, Brasil

Conferencia; 9th International Conference on Nanostructured Materials NANO 08; 2008

Ending the 90’ Nesper and his group presented and described the synthesis method to obtain vanadium oxide nanotubes (VOx NT’s). Since that moment an important effort has been dedicated towards the improvement of the synthesis methods and the characterization of the VOx physical and chemical properties. The VOx NT’s have organic molecules as template, which offers hardness and support to the NT. The walls of the NT consist of alternated layers of VOx and template. The VOx NT’s show potential technological applications as Li-battery cathodes. For example, previous studies show that the nanocomposite VOx/polyaniline presents more promising properties as cathode of batteries than the bulk material. The advantage of the nanostructured material is given by the large surface that can increase its performance as cathode. Recently, the magnetic and electric behavior of VOx–NT’s with high percentage of V4+ ions has been reported [1]. The authors found that half of these ions are antiferromagnetically coupled forming V4+–V4+ dimmers. On the other hand these NT’s are promising materials for gas sensors [2] and as bactericide (when Ag atoms are incorporated in the NT’s) [3]. We have synthesized VOx NT’s by the Sol-Gel method followed by hydrothermal treatment. We used primary amines (CnH2n+1NH2 with 4
n
16) and didecylamine ([CH3(CH2)9]2NH) as template. The morphology of the samples was analyzed by Transmission Electron  microscopy (TEM). The structure was characterized by X-Ray powder Diffraction (XRD) and Selected Area Electron Diffraction (SAED). The magnetic characterization of the NT’s was performed by EPR as function of temperature and dc-susceptibility.x NT’s). Since that moment an important effort has been dedicated towards the improvement of the synthesis methods and the characterization of the VOx physical and chemical properties. The VOx NT’s have organic molecules as template, which offers hardness and support to the NT. The walls of the NT consist of alternated layers of VOx and template. The VOx NT’s show potential technological applications as Li-battery cathodes. For example, previous studies show that the nanocomposite VOx/polyaniline presents more promising properties as cathode of batteries than the bulk material. The advantage of the nanostructured material is given by the large surface that can increase its performance as cathode. Recently, the magnetic and electric behavior of VOx–NT’s with high percentage of V4+ ions has been reported [1]. The authors found that half of these ions are antiferromagnetically coupled forming V4+–V4+ dimmers. On the other hand these NT’s are promising materials for gas sensors [2] and as bactericide (when Ag atoms are incorporated in the NT’s) [3]. We have synthesized VOx NT’s by the Sol-Gel method followed by hydrothermal treatment. We used primary amines (CnH2n+1NH2 with 4
n
16) and didecylamine ([CH3(CH2)9]2NH) as template. The morphology of the samples was analyzed by Transmission Electron  microscopy (TEM). The structure was characterized by X-Ray powder Diffraction (XRD) and Selected Area Electron Diffraction (SAED). The magnetic characterization of the NT’s was performed by EPR as function of temperature and dc-susceptibility.