Polyaniline (PAni) optical sensor in chloroform detection

A novel Fiber Bragg grating (FBG) coated with PAni film was used as a sensitive optical sensor for chloroform detection. In this study, the effect of synthesis parameters such as different dopant ratios (Ani: AOT= 5: 3, 5: 5 and 5: 7) and different polymerization temperatures (-5 degrees C, 0 degrees C and 25 degrees C) toward the efficiency of sensors were being investigated. Among the PAnis, PAni 5: 5 (0 degrees C) possessed the highest conductivity (1.627 x 10(-2) S/cm) and the best efficiency (sensitivity=0.0015) with response time of 7 s. The mechanism during chloroform detection was studied through Fourier Transform Infrared (FTIR) and Ultraviolet-visible (UV-vis) analysis, and the results showed clearly the physical interaction of the partial negative charge (C1(delta-)) of chloroform with the partial positive charge (NH delta+) on PAni chain. Besides, the sensor performance such as recyclability, selectivity, limit of detection (LOD), limit of quantitation (LOQ) and real sample analysis was studied in details in this study. (C) 2018 Elsevier B.V. All rights reserved.