Preparation and characterisation of NH3 gas sensor based on PANI/Fe-doped CeO2 nanocomposite
Chakavak Esmaeili, Saeed Ashtiani, Chhabilal Regmi, Alexandr Laposa, J. Voves, J. C. Kroutil, Karel Friess, Vojtěch Povolný, Saeid Lotfian
Abstract
PANI/Fe-doped CeO 2 nanocomposite was synthesised by the in-situ process. The produced powders were characterised by XRD , XPS , FT-IR , Raman , HRTEM and SEM-EDS tests. The sensors' function was based on PANI/Fe-doped CeO 2 nanocomposite with thin film deposited on top of interdigitated electrodes ( IDT ). NH 3 detection with PANI/Fe-doped CeO 2 nanocomposite sensor could be successfully performed even at room temperature (RT) and relative humidity of 45 %. Results demonstrated that PANI/Fe-doped CeO 2 might be promising sensing materials for detecting the low NH 3 concentration (ppm). In addition, the sensor is selective to the interfering gases, including CO , CO 2 and NO 2 . This sensor displays acceptable repeatability and stability over time.