Properties of confined CNTs in mesoporous alumina

CARBALLO, JULIETA; FELISBERTO, MARCOS; RIBETTO, FEDERICO; BARBERO, CÉSAR; MERLO, MAXIMILIANO; BAJALES LUNA, NOELIA

Belo Horizonte

Congreso; 18th International Conference on the Science and Applications of Nanotubes and low-dimensional materials; 2017

Structures based on carbon nanotubes (CNTs) grown from catalytic nanoparticles on mesoporous matrices are promising materials for various applications, ranging from nanoelectronics and biotechnology to superhydrophobic surfaces, reinforced composite materials and polymers. Moreover, applications of the CNT-based structures for waterdesalination is interesting for alluring prospects. Anodic aluminum oxide (AAO) membranes are often used as templates for such uni-dimensional systems. Carbon nanotubes embedded in the nanoporous alumina membrane demonstrate promising properties, but controllability of the nanotube growth in the membrane is still a challenge.In this work, we show results of the synthesis and multi-characterization of CNTs in alumina membrane with pore diameter of 20 nm. Nickel clusters were used as catalytic nanoparticles. Vibrational characterization was carried out by means of micro-Raman spectroscopy, while morphology and topography of CNTs was measured using SEM.Likewise, the electric and magnetic response of the hybrid system was monitored using a current source and a nanovoltemeter, when applying up to 1T, in the range of 10 K ? 290 K. Our results show that the confined CNTs exhibit MR of 0.2%, while the corresponding MR of free CNTs is around 12%.