Liu Wenyi, Hu Yanjun, Hou Yulong
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China.
Sensors (Basel). 2020 Feb 12;20(4):989. doi: 10.3390/s20040989.
The three polypyrrole (PPy) films with different mixture ratios, namely PPy1, PPy2, and PPy3, were synthesized by chemical oxidation with pyrrole and ferric chloride (FeCl). The roughened plastic optical fiber (POF) taper assembled PPy films (POF-PPy1, POF-PPy2, and POF-PPy3) were facilely prepared and bentU 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 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.
通过吡咯与氯化铁（FeCl）的化学氧化反应合成了三种不同混合比例的聚吡咯（PPy）薄膜，即PPy1、PPy2和PPy3。将粗糙化的塑料光纤（POF）锥形结构组装上PPy薄膜（POF-PPy1、POF-PPy2和POF-PPy3），简便地制备出用于室温下检测乙醇气体的弯曲U形结构。使用电子显微镜研究了PPy薄膜和粗糙化POF锥形结构的形貌。研究了三种PPy薄膜对气体响应的影响，结果表明POF-PPy2表现出5.08×10 dB/ppm的高灵敏度。该传感器的检测限为140 ppm，其响应时间和恢复时间分别为5 s和8 s。结果还表明，随着弯曲半径减小，响应时间和恢复时间逐渐缩短，而输出功率增加。此外，所提出的传感器具有成本低和结构简单的优点。
