Abstracts Book - IMRC 2018

• SA1-P018
ELECTRICAL TRANSPORT OF COMPOSITES FORMED BY ALIGNED
MULTIPLE WALL CARBON NANOTUBES IMMERSED IN AN
INSULATING POLYMER MATRIX
Asuncion Zeferino Martínez Elena 1,2 , Eloy Ramírez García 3 , Gerardo Ortega Cervantez 4 , Gabriela
Rueda Morales 4 , Jaime Ortiz López 4
1
Escuela Superior de Física y Matemáticas IPN, Física de los Materiales, Mexico. 2 Esime
zacatenco, Comunicaciones y Electrónica, Mexico. 3 Esime zacatenco, Telecomunicaciones,
Mexico. 4 Escuela Superior de Física y Matemáticas IPN, Física, Mexico.
This paper reports some measurement results regarding anisotropic electric
transport properties of composites formed by a non-conducting polymer
(Polyvinyl Alcohol, PVA) and aligned multiple Wall Carbon Nanotubes (MWNT).
This study was carried out using impedance spectroscopy. MWNT are
synthesized with a microwave-assisted technique using Cobalt (Co)
acetates. Transmission electron microscopy images show cobalt particles
located inside and at the tips of the MWNT. Cobalt particles inside carbon
nanotubes facilitate obtaining patterns of parallel-aligned MWNT in the
direction parallel or perpendicular to the plane of composite films by using small
magnetic fields (250 mT). MWNT alignment is accomplished during solidification
of the solutions from which the composites are prepared. The electrical
measurements were made at room temperature in a frequency range of 20 Hz
to 1 MHz on films of 2 cm in diameter and 100 μm thickness prepared with a
MWNT concentration of 1 wt%. The real part of the dielectric constant of the
films with aligned MWNT is larger compared to the one of films with disordered
MWNT. The electrical conductivity σAC as a function of frequency for the films
with ordered MWNT is 4 orders of magnitude higher compared to the composite
with disordered MWNT.
Keywords: Carbon nanotubes, dielectric, magnetic field
Presenting authors email: zefe_2@yahoo.com.mx