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Proceedings Paper

Moderate temperature-dependent surface and volume resistivity and low-frequency dielectric constant measurements of pure and multi-walled carbon nanotube (MWCNT) doped polyvinyl alcohol thin films
Author(s): Matthew Edwards; Padmaja Guggilla; Angela Reedy; Quratulann Ijaz; Afef Janen; Samuel Uba; Michael Curley
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Paper Abstract

Previously, we have reported measurements of temperature-dependent surface resistivity of pure and multi-walled carbon nanotube (MWNCT) doped amorphous Polyvinyl Alcohol (PVA) thin films. In the temperature range from 22 °C to 40 °C with humidity-controlled environment, we found the surface resistivity to decrease initially, but to rise steadily as the temperature continued to increase. Moreover, electric surface current density (Js) was measured on the surface of pure and MWCNT doped PVA thin films. In this regard, the surface current density and electric field relationship follow Ohm’s law at low electric fields. Unlike Ohmic conduction in metals where free electrons exist, selected captive electrons are freed or provided from impurities and dopants to become conduction electrons from increased thermal vibration of constituent atoms in amorphous thin films. Additionally, a mechanism exists that seemingly decreases the surface resistivity at higher temperatures, suggesting a blocking effect for conducting electrons. Volume resistivity measurements also follow Ohm’s law at low voltages (low electric fields), and they continue to decrease as temperatures increase in this temperature range, differing from surface resistivity behavior. Moreover, we report measurements of dielectric constant and dielectric loss as a function of temperature and frequency. Both the dielectric constant and dielectric loss were observed to be highest for MWCNT doped PVA compared to pure PVA and commercial paper, and with frequency and temperature for all samples.

Paper Details

Date Published: 7 September 2017
PDF: 12 pages
Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 103820I (7 September 2017); doi: 10.1117/12.2273875
Show Author Affiliations
Matthew Edwards, Alabama A&M Univ. (United States)
Institute of Higher Science Eduacation Advancements Research (United States)
Padmaja Guggilla, Alabama A&M Univ. (United States)
Angela Reedy, Alabama A&M Univ. (United States)
Quratulann Ijaz, Troy Univ. (United States)
Afef Janen, Alabama A&M Univ. (United States)
Samuel Uba, Alabama A&M Univ. (United States)
Michael Curley, Alabama A&M Univ. (United States)

Published in SPIE Proceedings Vol. 10382:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI
Shizhuo Yin; Ruyan Guo, Editor(s)

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