Abstract
The three polypyrrole (PPy) films with different mixture ratios, namely PPy1, PPy2, and PPy3, were synthesized by chemical oxidation with pyrrole and ferric chloride (FeCl3). The roughened plastic optical fiber (POF) taper assembled PPy films (POF-PPy1, POF-PPy2, and POF-PPy3) were facilely prepared and bent U shape structure for testing ethanol gas at room temperature. The morphologies of the PPy films and the roughened POF taper were studied using electron microscopy. The effect of the three PPy films on the gas response was investigated and the results showed that the POF-PPy2 exhibited a high sensitivity of 5.08 × 10−5 dB/ppm. The detection limit of the sensor was 140 ppm and its response and recovery times were 5 s and 8 s, respectively. The results also showed that as the bending radius decreased, the response and recovery times gradually shortened, while the output power increased. In addition, the proposed sensor has advantages of a low cost and simple structure.
Highlights
Due to the high numerical aperture (NA), proper curvature, and secure processing, plastic optical fibers (POFs) have attracted significant attention from researchers and have been widely used in different applications such as gas detection, biomedical, and other fields [1,2,3,4]
The friction force of the roughened POF prevents the movement of the PPy film on the surface of the fiber, making the proposed sensor more stable
ItIt can the surface of the fiber structure, the micrographs of the unprocessed and roughened POFs presented the surface of the fiber structure, the micrographs of the unprocessed and roughened
Summary
Due to the high numerical aperture (NA), proper curvature, and secure processing, plastic optical fibers (POFs) have attracted significant attention from researchers and have been widely used in different applications such as gas detection, biomedical, and other fields [1,2,3,4]. The friction force of the roughened POF prevents the movement of the PPy film on the surface of the fiber, making the proposed sensor more stable. Machida et al [24] studied the effects of different configuration solutions on the (FeCl3), ammonium sulfate, and ammonium persulfate were used as oxidants to prepare PPy films oxidation of FeCl3 and pyrrole. Their experimental results showed that when methanol was used as a [21,22,23]. 1400recovery ppm, thetimes response recovery timeswere of the were 15 s and 17 s, respectively
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