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Journal of Sensors
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Journal of Sensors
/
2019
/
Article
/
Fig 2
/
Research Article
Surface Acoustic Wave Sensors for Ammonia Detection at Room Temperature Based on SnO
2
/Co
3
O
4
Bilayers
Figure 2
SEM images of (a) SnO
2
layer, (b) Co
3
O
4
layer, and (c) SnO
2
and Co
3
O
4
layer cross section.
(a)
(b)
(c)