柔性PANI-SnO_2复合薄膜的制备及其对NH_3的气敏特性
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摘要
以苯胺与二氧化锡(SnO_2)为前体,通过将原位化学氧化聚合法与静电吸附相结合,在柔性衬底聚酰亚胺(PI)上制备了聚苯胺-二氧化锡(PANI-SnO_2)复合薄膜。通过傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)与X射线衍射(XRD)对复合薄膜的结构与形貌进行表征,证实了PANI-SnO_2的成功合成与复合。对其在室温条件下进行了一系列气敏性能测试,结果表明SnO_2的添加有效提升了PANI对氨气(NH_3)的响应能力;该PANI-SnO_2复合薄膜对体积分数为1×10~(-5)～6×10~(-5)的NH_3具有良好的灵敏度,此外,该复合薄膜具有良好的重复性与选择性;而且在进行弯折处理后,PANI-SnO_2对NH_3的响应值并无明显变化。上述结果都表明PANI-SnO_2复合薄膜对NH_3的检测具有实际应用价值。
With aniline and tin dioxide(SnO_2)as precursor,the polyaniline-tin dioxide(PANISnO_2)composite film was prepared on a flexible substrate polyimide(PI)by combining the insitu chemical oxidation polymerization with electrostatic adsorption method.The structure and morphology of the composite film were characterized by Fourier transform infrared spectroscopy(FTIR),scanning electron microscope(SEM)and X-ray diffraction(XRD),confirming the successful synthesis and combination of the PANI-SnO_2.A series of gas sensing tests were carried out at room temperature.The results indicate that the addition of SnO_2 effectively improves the response of PANI to ammonia(NH_3).The composite film has a good sensitivity to ammonia gas with the volume fraction of 1×10~(-5)～6×10~(-5).Furthermore,the PANI-SnO_2 composite film has good repeatability and selectivity.After bending treatment,the response of the PANI-SnO_2 to NH_3 does not change significantly.All results indicate that the PANI-SnO_2 composite film has practical application value for detecting NH_3.
With aniline and tin dioxide(SnO_2)as precursor,the polyaniline-tin dioxide(PANISnO_2)composite film was prepared on a flexible substrate polyimide(PI)by combining the insitu chemical oxidation polymerization with electrostatic adsorption method.The structure and morphology of the composite film were characterized by Fourier transform infrared spectroscopy(FTIR),scanning electron microscope(SEM)and X-ray diffraction(XRD),confirming the successful synthesis and combination of the PANI-SnO_2.A series of gas sensing tests were carried out at room temperature.The results indicate that the addition of SnO_2 effectively improves the response of PANI to ammonia(NH_3).The composite film has a good sensitivity to ammonia gas with the volume fraction of 1×10~(-5)～6×10~(-5).Furthermore,the PANI-SnO_2 composite film has good repeatability and selectivity.After bending treatment,the response of the PANI-SnO_2 to NH_3 does not change significantly.All results indicate that the PANI-SnO_2 composite film has practical application value for detecting NH_3.
引文
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[7] ZHU L,ZENG W.Room-temperature gas sensing of ZnObased gas sensor:a review[J].Sensors and Actuators:A,2017,267:242-261.
[8] DEY A.Semiconductor metal oxide gas sensors:a review[J].Materials Science and Engineering:B,2018,229:206-217.
[9]杜海英,王兢,王娟,等.聚苯胺及其掺杂材料的制备及气敏特性的研究[J].功能材料,2011,42(12):2289-2293.
[10] PANDEY S.Highly sensitive and selective chemiresistor gas/vapor sensors based on polyaniline nanocomposite:a comprehensive review[J].Journal of Science:Advanced Materials and Devices,2016,1(4):431-453.
[11]刘雪燕,太惠玲,刘春华,等.PPy-CeO2复合薄膜柔性NO2传感器的制备与气敏特性研究[J].传感技术学报,2018,31(2):163-169.
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[14] SEN T,MISHRA S,SHIMPI N G.Synthesis and sensing applications of polyaniline nanocomposites:a review[J].RSC Advances,2016,6(48):42196-42222.
[15] ZHANG D Z,JIANG C X,SUN Y E.Room-temperature high-performance ammonia gas sensor based on layer-by-layer self-assembled molybdenum disulfide/zinc oxide nanocomposite film[J].Journal of Alloys and Compounds,2017,698:476-483.
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[17] LIU C H,TAI H L,ZHANG P,et al.Enhanced ammoniasensing properties of PANI-TiO2-Au ternary self-assembly nanocomposite thin film at room temperature[J].Sensors and Actuators:B,2017,246:85-95.
[18] LI S Q,LIN P F,ZHAO L P,et al.The room temperature gas sensor based on polyaniline@flower-like WO3nanocomposites and flexible PET substrate for NH3 detection[J].Sensors and Actuators:B,2018,259:505-513.
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