Current Versus Voltage Relationships and Temperature Dependent Surface Resistivity Measurements of Commercial, Multiwall Carbon Nanotubes (MWCNT), and Silver Nano-Particle Doped Polyvinyl Alcohol (PVA) Thin Films

Current Versus Voltage Relationships and Temperature Dependent Surface Resistivity Measurements of Commercial, Multiwall Carbon Nanotubes (MWCNT), and Silver Nano-Particle Doped Polyvinyl Alcohol (PVA) Thin Films

Pure and doped Polyvinylidene Difluoride (PVDF) films, for the detection of infrared radiation, have
been well documented using the mechanism of pyroelectricity. Alternatively, the electrical properties
of films made from Polyvinyl Alcohol (PVA) have received considerable attention in recent years. The
investigation of surface resistivity of both such films, to this point, has received far less consideration
in comparison to pyroelectric effects. In this research, we report temperature dependent surface
resistivity measurements of commercial, and of multiwall carbon nanotubes (MWCNT), or Agnanoparticle

doped PVA films. Without any variation in the temperature range from 22°C to 40°C with controlled humidity,

we found that the surface resistivity decreases initially, reaches a minimum, but rises steadily as the temperature

continues to increase. Also, we report surface current versus voltage measurements that indicate a linear result

or an Ohm’s law behavior at low voltages, less than 400 volts while the current exists on the surface of the dielectric.

This research was conducted with the combined instrumentation of the Keithley Model 6517 Electrometer and Keithley

Model 8009 resistivity test fixture using both commercial and in-house produced organic thin films. With the
objective to quantify the suitability of PVDF and PVA films as IR detector materials, when using the
surface resistivity phenomenon, instead of or in addition to the pyroelectricity, surface resistivity
measurements are reported when considering bolometry. We found that the surface resistivity
measurements on PVA films were readily implemented.

Author (s) Details

Matthew Edwards
Department of Physics, Chemistry & Mathematics, Alabama A&M University, Normal, AL, USA.

Stephen Egarievwe
Department of Engineering, Construction Management & Industrial Technology, Alabama A&M University, Normal, USA.

Afef Janen
Department of Physics, Chemistry & Mathematics, Alabama A&M University, Normal, AL, USA.

Tatiana Kukhtarev
Department of Physics, Chemistry & Mathematics, Alabama A&M University, Normal, AL, USA.

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