Synthesis And Sorption For Surface Acoustic Wave Of SXFA In Chemical Sensors

Toxic or hazardous gases such as chemical weapon agents or explosives will kill man at every time. There are many kinds of methods to detect and monitor toxic or hazardous gases such as chemical weapon agents or explosives such as X-ray,γ-ray, GC, chemical sensor,FTIR and so on.We can detect high sensitive, fastenly, facilitily by chemical sensor.A miniature surface acoustic wave (SAW) chemical sensor is a kind of vapor sensor which has been utilized to detect and monitor toxic or hazardous gases such as chemical weapon agents or explosives in real-time. Reversible sorption can happen between sensing film on SAW sensor and the analyte. Some characters of SAW sensor such as spreading speed between different phase will be changed for the sorption. In result of the aforementioned changes, a corresponding alteration will happen to the frequency, so the quantitative analysis can be carried out.Allylmethylpolysiloxane was obtained by hydrolyzation. A hexafluoro- dimethylcarbinol functionlizated polymer of polysiloxane, Poly(methyl(4-hydroxy-4,4-bis(trifluoromethyl)but-1- yl)siloxane)(SXFA) was synthesized through the reaction between hexafluoroacetone and polysiloxane . SXFA was coated on SAW sensors. A shift of 21kHz in SAW frequency was observed to the simulacrum gas of dimethyl methylphosphonate (DMMP). The factors to adsorption were also discussed in this paper.