Biomedical Engineering Reference
In-Depth Information
behavior was explained on the basis of the volume expansion and
polar interaction of the CNT surface with vapor molecules under test.
The f-CNT/PMMA showed a significant improvement on the sensor's
behavior including sensitivity, response time, and recovery time.
This can be attributed by the effects of oxidation on the electronic
properties of the CNT fillers in the nanocomposite.
Penza
. [179] demonstrated that highly sensitive
microacoustic vapor sensors based on SAW 433 MHz oscillators
were able to detect volatile organic compounds (VOCs) at room
temperature using a nanocomposite film of HiPco single-walled
carbon nanotubes (HPNTs) embedded in a cadmium arachidate
(CdA) amphiphilic organic matrix prepared by the LB technique with
a different weight SWCNTs filler content. The structural properties
and the surface morphology of the nanocomposite were examined
by X-ray diffraction, transmission, and scanning electron microscopy,
as shown in Fig. 9.20. HR-TEM image revealed that the pristine as-
received SWCNTs were organized in tangled bundles with diameters
et
al
(a)
(b)
(c)
Figure 9.20
(a) SEM image of the SWCNT-CdA 27.5 wt.% LB nano-
composite film. (b) TEM image of pristine HiPco SWCNTs
material used as filler in the nanocomposite. (c) Comparison
of room temperature sensitivity of the nanocomposite
SWCNT-CdA LB film with different weight filler content onto
SAW 433 MHz and QCM 10 MHz transducer. This figure is
reprinted and adapted with permission from Elsevier [179].
