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has been used in all demonstrations to make continuous, long nanofibers
either in an orderly fashion (NFES) or as randomly distributed networks
(FFES). Nanogenerators using single nanofiber nanogenerators are marked
as 'S', those using multiple nanofibers are marked 'M'. The diameters of
these fibers are from as small as 60 nm to a few micrometres. While some
reports didn't provide information on the applied strain or strain rate and
some didn't record the peak current values, all have measured the peak
voltage values from a wide range of less than 1 mV to 2.21 V (large number of
nanofibers). In order to provide better prospects for future directions
stemming from the current results, manufacturing methodologies, material
properties and experimental procedures/characterizations are to be dis-
cussed in the following sections.
It is noted in a recent report that a PZT-based nanofiber nanogenerator
has demonstrated up to 209 V peak voltage as shown in Figure 7.10.
76
d
n
3
r
4
n
g
|
2
.
Figure 7.10
(a) Regionally aligned PZT nanofibers are stacked layer by layer to
enhance the total electrical output. The stacked layers are then rotated
90 degrees for electrode connections. (b) Impact pressure (
0.53 MPa)
by a heavy object generate strains in the stacked layers that can produce
a local potential difference of up to 209 V. The serial connection,
however, does not increase the total current output at about 20 mA.
Reprinted with permission from ref. 85. Copyright (2013) American
Chemical Society.
B
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