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摘要:
Polypyrrole (Ppy) was synthesized using Ferric Chloride (FeCl3) as oxidant. The ratio of monomer to oxidant was 1:2.4. The polymerization was carried out at 5。C. Attempts were made to increase the electrical conduc-tivity by using various dopants viz. Lithium per Chlorate (LiClO4), para-Toluene Sulfonate (p-TS) and Nap-thalene Sulfonic acid (NSA). The materials were characterized using FTIR, X-Ray diffraction and SEM. The electrical conductivity was measured by two probe method and was found to be in the range of 10-3 to 10-2 S/cm. Thin films of these preparations were casted on the interdigited electrodes to study the detection of gases such as ammonia and LPG. It was found that for the pure Ppy and one doped with LiClO4, when ammonia gas was allowed to flow in, there was a sudden increase in the current, which decreased rapidly when gas was stopped. This behavior is in contradiction to that observed in earlier investigations where Ppy was prepared by electrochemical method. However when Ppy doped with p-TS and NSA were used, the trend was reversed. Similarly it was noted that for pure Ppy and one doped with LiClO4, p-TS and NSA there was an increase in the current when LPG gas was brought in. However the response to LPG was somewhat low as compared ammonia gas.
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篇名 Synthesis of Polypyrrole Using Ferric Chloride (FeCl<sub>3</sub>) as Oxidant Together with Some Dopants for Use in Gas Sensors
来源期刊 传感技术(英文) 学科 化学
关键词 POLYPYRROLE Structure Doping Gas Sensor Ammonia
年,卷(期) 2011,(2) 所属期刊栏目
研究方向 页码范围 47-56
页数 10页 分类号 O6
字数 语种
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POLYPYRROLE
Structure
Doping
Gas
Sensor
Ammonia
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传感技术(英文)
季刊
2161-122X
武汉市江夏区汤逊湖北路38号光谷总部空间
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114
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