Design and fabrication process of surface acoustic wave(SAW) gas sensor for dimethyl-methylphosphonate(DMMP) detection is presented.To improve detection sensitivity and selectivity
frequency stability of SAW oscillator is considered carefully
and the 11-mercaptoundecanoic acid(MUA) adopts molecule selfassembled technology and chenically modified by Cu2+.Experimental result shows good linearity and the superior sensitivity of 21 Hz/mg/cm3 at concentration range of 1