%0 Journal Article
%T Synthesis, structural characterization and formation mechanism of giant-dielectric CaCu3Ti4O12 nanotubes
%A Nirupam Banerjee
%A Saluru Baba Krupanidhi
%J Natural Science
%P 688-693
%@ 2150-4105
%D 2010
%I Scientific Research Publishing
%R 10.4236/ns.2010.27085
%X A capillary-enforced template-based method has been applied to fabricate calcium copper titanate (CaCu3Ti4O12, CCTO) nanotubes (diameter ~200 nm) by filling sol-gel CCTO precursor solution into the nanochannels of porous anodic aluminum oxide (AAO) templates, subsequent heating for phase formation and fi- nally the removal of nano-channel templates by applying basic solution. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) equipped with Energy-dispersive X-ray spectroscopy (EDX) have been employed to characterize the morphology, structure, and composition of as-prepared nanotubes. XRD and selected-area electron diffraction (SAED) in-vestigations demonstrated that postannealed (750¡ðC for 1 h) CCTO nanotubes were poly-crystalline with a cubic pseudo-perovskite cry- stal structure. The FE-SEM and TEM results showed that CCTO nanotubes were of uniform diameter (~200 nm) throughout their length. High resolution TEM (HRTEM) analysis confirm- ed that the obtained CCTO nanotubes are made of randomly aligned nano-particles 5-10 nm in size. EDX analysis demonstrated that stoichi- ometric CaCu3Ti4O12 was formed. The possible formation mechanism of CCTO nanotubes in the AAO template is discussed.
%K Nano-Tubes
%K Sol-Gel
%K Templated Growth
%K High-K-Dielectrics
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=2299