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A sensitive, selective and reliable sensing techniques for ammonia (NH 3) gas detection have been highly demanded since NH 3 is both a commonly utilized gas in various industrial sectors, and considered as a toxic and caustic agent that can threat human health and environment at a certain level of concentrations. In this article, a brief on the fundamental working principles of sensor specifications of the analytes detection techniques relying has been reviewed. Furthermore, the mechanism of NH 3 detection and recent progress in the development of advanced carbon nanotubes (CNTs)-based NH 3 gas sensors, and their performance towards the hybridization with the conductive polymers was