Thin polymer film based rapid surface acoustic wave humidity sensors

Palladium Nanoparticle-Based Surface Acoustic Wave Hydrogen Sensor

“…1,4 The relative advantages and disadvantages of each type of sensor are discussed in detail elsewhere. 1 In the present work, a special type of acoustic sensor, a Surface Acoustic Wave (SAW) device, will be considered because it is small, offers a passive, wireless sensing platform, and when coated with an appropriate chemically selective layer, may function as a chemical vapor sensor with extremely high sensitivity.…”

Characterization of graphene oxide nanofilms obtained by the SAW atomization

“…The graphene oxide films were deposited onto the surface of quartz, LiNbO 3 and Si substrates by atomization of 0.2 and 0.35-l droplets of GO aqueous dispersions by the SAW atomization technique.…”

“…For that reason some types of the SAW sensors-gas, biological, or humidity sensors-must have special coatings deposited onto the SAW propagation path between the interdigital transducers (IDTs) of the device. For example, thin films of polyvinyl alcohol (PVA) [2,3] and graphene oxide (GO) [4] find use as sensitive coatings for humidity sensors.…”

High-sensitivity optical humidity sensor based on a thin dielectric waveguide

“…A number of techniques to probe the properties of these films and to get better response times have recently been reported. Most of them measure variations of a given parameter that can be of electrical [3,4], acoustical [5,6], or optical [7][8][9] nature. In principle, optical sensors can be more advantageous than their electrical counterpart as they are less sensitive to electromagnetic interference.…”