Biomedical Engineering Reference
In-Depth Information
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Time
Time
Sensor
(a)
(b)
Figure 8.21
Examples of output amplitude waveforms observed for a touch sensor when
moved over a (a) smooth substrate and (b) irregularly patterned holes in a substrate.
to the unchanged and continuous waveform observed when the sensor is moved
over a smooth surface (Figure 8.21a). The sensor studies carried out in this work
clearly prove that the CaCl
2
and MWCNTs modified PVDF has a piezoelectric
response; one reason may be that their larger remnant polarization value is aided
by the increasing
-phase for electrospun samples compared to their cast samples.
It is also expected that polymer-based touch sensors of this type will have good
mechanical properties and will maintain their structure so that they will be able to
withstand the wear and tear when incorporated in smart textiles.
β
8.5.3
Force Sensors Based on Copolymer P(VDF-TrFE) with Different VDF Contents
Guangyi Ren, Baozhang Li, and Chunye Xu
Figure 8.22 shows a schematic representation of the flexible pressure sensor.
The electrospun web with aluminum foil was sandwiched between ITO coated
polyethylene terephthalate(PET-ITO) film and plastic film. In this sample, ITO
Plastic
ITO
+
Electrospun
nanofiber web
Al foil
−
Plastic
Flexible sensor
(a)
(b)
Figure 8.22
Schematic drawing (a) and photos (b) of sensors based on electrospun
copolymer fabrics.
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