Properties of confined CNTs in mesoporous alumina

MARCOS FELISBERTO; JULIETA CARBALLO; MARCOS FELISBERTO; JULIETA CARBALLO; NOELIA BAJALES; MAXIMILIANO MERLO; NOELIA BAJALES; MAXIMILIANO MERLO; CESAR BARBERO; FEDERICO RIBETTO; CESAR BARBERO; FEDERICO RIBETTO

Belo Horizonte

Conferencia; 18th International Conference on the Science and Application of Nanotubes and Low-dimensional Materials; 2017

Structures based on carbon nanotubes grown from a 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 nanotube-based structures for water desalination is interesting for alluring prospects. Mesoporous aluminium oxide (alumina) membranes are often used as templates for such unidimensional 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 a multi-characterization of CNTs in alumina membrane with pore diameter of 20 nm. As catalytic nanoparticles, Ni clusters were used. Vibrational characterization was made by means of micro-Raman spectroscopy, while morphology and topography of CNTs was measured using SEM and AFM. The width of the confined CNTs was analyzed by HRTEM in order to determine whether SW or MW was grown. Likewise, the electric and magnetic response of the hybrid system was monitored using a current source and nanovoltemeter, when applying up to 1T, in the range of 10 K ? 290 K. Our results show that the confined CNTs result exhibits a magnetorresistance higher than 7% at room temperature.