Volume 97, Number 2, January 2012
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 January 2012|
Conformal coating of ferroelectric oxides on carbon nanotubes
Institute for Functional Nanomaterials, University of Puerto Rico - P.O. Box 23343, San Juan, PR 00931, USA
2 Department of Physics, University of Puerto Rico - P.O. Box 70377, San Juan, PR 00936, USA
3 Department of Earth Science, University of Cambridge - Cambridge CB2 1PZ, UK, EU
4 Department of Chemistry, University of Puerto Rico - P.O. Box 70377, San Juan, PR 00936, USA
Accepted: 28 November 2011
Nano-size barium strontium titanate Ba0.7Sr0.3TiO3 (BST) maize-bead–like structures were conformally coated on bamboo-like carbon nanotubes (BCNTs) grown on copper substrates. Initially BCNTs were fabricated by hot-filament chemical vapor deposition (HF-CVD) techniques on Cu substrates. Later, BST was deposited on BCNT/Cu by pulsed laser deposition (PLD) techniques. Surface morphology, cross-sectional image and topography of the BCNTs and BCNT-BST maize-like nanostructures were investigated by X-ray, field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy and tunneling electron microscopy (TEM) techniques. BST-BCNT hybrid structures provide an additional degree of freedom to interconnect the oxides, which in turn provides [3D] geometry for functionality. There had been a popular misconception that oxides cannot grow on CNT at high temperature; this long-standing problem has now been solved. The present unregistered nanostructures can be used as sensors; however, if these structures are made as registered arrays, they can be used as nonvolatile memory elements and high-energy density capacitors.
PACS: 77.55.fe – BaTiO3-based films / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2012
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