一种新型PPy丙酮气体敏感膜的制备研究

The fabrication of a new type polypyrrole polymer for acetone gas sensing

目的利用羟丙基甲基纤维素(HPMC)作为模板在溶液中合成一种新型的纳米尺度的聚吡咯(PPy)颗粒,并初步探索该PPy颗粒对丙酮气体的反应性。方法吡咯单体在三氯化铁的作用下氧化形成PPy,非离子型表面活性剂HPMC在研究中作为模板以形成纳米尺度的聚合物颗粒,本研究使用场效应扫描电镜(FE-SEM)以及傅立叶红外光谱分析仪(FT-IR)对该新型PPy颗粒进行表征。将该聚合物材料旋涂于SAW器件表面制备成SAW气敏芯片,对10ppm、100ppm的丙酮气体和9.4ppm的氨气进行敏感性分析。结果使用HPMC作为模板合成的新型PPy颗粒直径有随HPMC含量一起增加的趋势,但均明显小于不用HPMC作为模板所合成的PPy颗粒的直径;红外光谱分析表征出了吡咯环典型的振动波峰;该PPy敏感膜对丙酮的反应性优于氨气,SAW传感器频率变化幅度随丙酮浓度增加而增加。结论利用HPMC作为模板合成了一种具有纳米尺度的新型PPy颗粒,该材料对丙酮气体敏感性较好,可以作为丙酮气体检测的敏感膜材料。

Objective To fabricate a new-type nanoscaled polypyrrole（PPy） particles with HPMC soft template and explore the responsibility of this PPy particles to acetone gas.Methods Pyrrole monomer was oxidized by FeCl3 to generate PPy.HPMC was used as soft template to form the nanoscaled polymers.Field emission sccmning electron microscopes（FE-SEM） and fourier transform infrared（FT-IR） were used to characterize the new type PPy particles.Then the PPy were spin-coated onto the surface of surface acoustic wave（SAW） transducer to form SAW gas sensor.At last,we investigated the responsibility of SAW gas sensor to 10 and 100ppm acetone gas and 9.4ppm ammonia gas.Results The diameters of the PPy particles synthesized with the help of HPMC have a trend of being bigger along with the concentration of HPMC.However,all PPy particles synthesized with the help of HPMC have obviously smaller diameter（about 100 nm） than that（above 500 nm） of the PPy particles synthesized without the help of HPMC.The FT-IR have shown the typical vibrations of the PPy.The PPy particles have better responsibility to acetone gas than to ammonia gas.The shift of SAW gas sensor became larger along the increase of the concentration of acetone gas.Conclusion We have fabricated a new type nanoscaled polypyrrole（PPy） particles with HPMC soft template and coated this PPy particles onto the surface of SAW transducer.The SAW gas sensor coated with PPy particles response better to acetone gas than to ammonia gas.The PPy particles could be used as sensitive polymer along with SAW gas sensor.