Ammonia Gas Sensors Based on In Situ and Drop-Coated Polyaniline Nanostructures

Abstract:

Polyaniline (PANI) nanostructures are successfully prepared and deposited by in-situ and drop-coating on glass substrates without using any template. By changing synthesis and deposition method, a new morphology of nanostructures, “the cauliflower-like structure”, is developed. These nanostructures were then tested as optical ammonia gas sensors by measuring the optical absorbance variations at 632 nm at different NH3 concentrations. The results show a strong dependence of the morphology on the deposition method. The in-situ one leads to better performances compared to the drop coated one. Protonation /deprotonation is the mechanism of interaction between NH3 molecules and PANI nanostructures.

• Periodical: Advanced Materials Research (Volume 685)
• Pages: 134-138
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.685.134
• Online since: April 2013
• Authors: Houria Kebiche, D. Debarnot, A. Merzouki, F. Poncin-Epaillard, N. Haddaoui
• Keywords: Ammonia Gas, Chemical Synthesis, Gas Sensor, Nanostructure, Polyaniline

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