Zinc oxide (ZnO) nanopowder of size 50±10 nm has been synthesized
using low temperature synthesis technique. The ZnO and multiwall carbon nanotubes
(CNTs) were mixed in equal amounts. Both types of powders (ZnO and
ZnO-CNTs) were tested to measure the effect of pressure using a specially designed
transducer. Upon rising pressure from zero to 8.15 kN/m2, the change in
impedance was found 35% and 17% and change in capacitance was 41% and 10%
while the change in impedance was 36% and 38%, respectively for ZnO and ZnOCNTs
nanopowders. The observed changes in the electrical parameters may be
regarded as the sample’s densification and porosity reduction due to pressure.
With respect to ZnO-CNTs the ZnO shows higher change in resistance; that can be
credited to displacement currents.
Keywords: Capacitance, carbon nanotubes (CNTs), impedance, pressure sensing, transducer, zinc oxide nanopowder.
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