1Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
2School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
Adv. Mater. Lett., 2015, 6 (12), pp 1098-1103
Publication Date (Web): Nov 24, 2015
Copyright © IAAM-VBRI Press
The electrical and dielectric properties of 3 and 5 wt. % of multi-walled carbon nanotube (MWCNT) containing Se85Te10Ag5 glassy composites have been investigated in the frequency range 20 Hz to 2 MHz from room temperature to 387 K. It has been found that the electrical conductivity is enhanced by 6 to 9 orders of magnitude up to 5 wt. % of MWCNT content resulting in transition for insulating to conducting behaviour. The activation energies for all samples have also been evaluated from the Arrhenius plot of the DC conductivity which shows a decreasing trend up to 5 wt. % MWCNT content. The largest dielectric constant of 142 (almost 10 times greater than pristine Se85Te10Ag5 glassy alloy) has been observed for 5 wt. % of MWCNT content at room temperature in low frequency range. Therefore it can be inferred that the electrical and dielectric properties of the chalcogenide glasses can be altered by the admixing or doping of carbon nanotubes (CNTs). The enhanced dielectric constant and electrical conductivity can be attributed to interface effect between MWCNT and the glassy matrix.
Multi-walled carbon nanotube, glassy composite, dielectric constant, electrical conductivity.