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本文研究了在声表面波振荡器的叉指形压电晶体基片上,用L—谷氨酸·HCl井掺入聚乙二醇400为膜材料。可以选择地测定NH_3气体。并在成膜方法上试验了点样蒸发凝结法和LB法成膜法,取得较好的结果,测定NH_3气的极限值为1×10~(-5)mol/L,响应时间15sec,恢复时间小于30sec。
In this paper, polyethylene glycol 400 is doped with L-glutamic acid as a membrane material on the interdigital piezoelectric crystal substrate of a SAW oscillator. The NH3 gas can be optionally measured. The results showed that the limit value of NH 3 gas was 1 × 10 -5 mol / L and the response time was 15 seconds. Time is less than 30sec.