New sensitive layers for surface acoustic wave gas sensors based on polymer and carbon nanotube composites

Surface acoustic wave devices for chemical sensing and microfluidics: a review and perspective

“…Generally, the SAW propagation speed v is the speed of sound of the crystal, but changes in mass, stiffness, conductivity, dielectric coefficient, temperature and pressure can all modulate this propagation speed. 50,51 This change in propagation speed will proportionally shift both the resonant frequency f and phase ϕ of the SAW as 52 …”

Mesoporous silica nanoparticle film as sorbent for in situ and real-time monitoring of volatile BTX (benzene, toluene and xylenes)

“…For example, a nanocomposite film adsorbent made of polymer and carbon nanotubes was deposited over an acoustic wave sensor. This device allowed rapid, repetitive and sensitive determination of toluene, but no selectivity versus other monocyclic molecules was reported [21]. A more complex strategy has been proposed, using flow injection analysis with a biosensor based on living bacteria.…”

Tetra-tert-butyl copper phthalocyanine-based QCM sensor for toluene detection in air at room temperature

“…VOCs sensors based on UV-visible transduction have been also widely developed [16][17][18][19][20][21] because of their high level of discrimination of BTX gases as well as their low threshold of detection but suffer from a lack of portability and high cost. Surface Acoustic Wave (SAW) based sensors have been also investigated [22][23][24][25][26], their main drawbacks being their low resolution and high threshold of detection. Many developments are also in progress on the miniaturization of analyzers like hand held mass spectrometer designed for BTX detection [27].…”