Affiliation:
1. National Centre of Excellence in Physical Chemistry University of Peshawar Peshawar Pakistan
2. Jinnah College for Women University of Peshawar Peshawar Pakistan
Abstract
AbstractHighly efficient gas sensors fabrication having low detection limits have been one of key research area due to the industrial, environmental and other technological applications. In this study, polyaniline/bismuth doped zinc oxide (PANI/Bi‐ZnO) was prepared via inverse emulsion polymerization and it was coated over a substrate with staggered electrodes to create a highly efficient ammonia (NH3) sensor. The UV/Vis investigation, fourier transformed infrared (FTIR), raman spectral analysis, and scanning electron microscopy (SEM) were used to describe the structure and morphology of prepared samples. At room temperature, the PANI/Bi‐ZnO sensor's sensitivity to various NH3 gas concentrations ranging from 20 to 100 ppm was examined. According to the experimental findings, the PANI/Bi‐ZnO film exhibits outstanding performance of response and selectivity. The response at 20 ppm NH3 was as high as ⁓100%. The response and recovery time was also calculated at 20 ppm and was 11/15 s. The contact between p‐n heterojunctions in the composite is responsible for the exceptional sensitivity of PANI/Bi‐ZnO towards NH3 sensing.Highlights
Synthesis of Bi doped ZnO composites with PANI at room temperature
Fabrication of highly sensitive and efficient resistive type ammonia sensor
Selective and robust detection of ammonia by the fabricated sensor
High sensitivity with low limit of detection offered by the sensor
Response of the fabricated sensor at 20 ppm NH3 was as high as ⁓100%
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