Biomedical Engineering Reference
In-Depth Information
wave phase velocity for ZnO (2850 m/s) is less than the shear wave
phase velocity for the 36° Y-cut, X-propagation LiTaO
(4150 m/s)
substrate. This results in a Love mode of wave propagation. For Love
mode, the phase velocity of acoustic wave in the layer should be less
than the substrate, as reported in our Love wave device based on
ZnO film on 36° YX LiTaO
3
substrate.
3
Figure 9.39
SAW phase response of the uncoated reference ZnO/LiTaO
3
device and the ZnO/LiTaO
Love mode sensor coated with
10 monolayers 75 wt.% SWCNTs-in-CdA LB nanocomposite
film to (
3
gas, at room
temperature. Calibration curves in phase change of a SAW
ZnO/LiTaO
Top-Left
) NO
gas and (
Down-Left
) NH
2
3
Love mode sensor coated with 10 monolayers
75 wt.% SWCNT-in-CdA LB nanocomposite film toward
(
3
gas, at room
temperature. This figure is reprinted and adapted with
permission from Elsevier [291].
Top-Right
) NO
gas and (
Down-Right
) NH
2
3
This layered SAW device operated at a frequency of 69.3 MHz
coated with a 10 monolayer nanocomposite LB layer based on
75 wt.% SWCNT-filler in the host CdA matrix. The CdA is a host material
very suitable for LB deposition process, as reported elsewhere
[113, 179]. A functional layer of 10 and 30 LB monolayers of SWCNT-
based 75 wt.% nanocomposite film was deposited onto surface of
