In the present study, highly monodispersed polyaniline (PANI) and gold nanoparticles grafted PANI nanospheres ([email protected]) have been fabricated through a facile wet-chemical synthesis process by in-situ polymerization of aniline. The structural characterization of the PANI and [email protected] nanospheres were carried out by UV-Vis spectroscopy, FT-IR spectroscopy, and High Resolution Transmission Electron Microscopy (HR-TEM). Stable uniform sized nanospheres of PANI and [email protected] obtained were found to exhibit superior gas sensor performance towards trace-level concentration of ammonia (NH3) gas in the range of 1-5 ppm. A comparative analysis of the sensor properties of PANI and [email protected] nanospheres were performed under ambient conditions. [email protected] nanospheres exhibited enhanced gas sensing performance with high sensitivity (58.2%), rapid response (48 s) and recovery (58 s) characteristics (1 ppm of NH3). The results indicate the potential use of [email protected] nanospheres for fabrication of efficient NH3 sensors for varied applications.
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