Abstract
In this paper, two-dimensional layered PANI@MoS2 composite with promising energy storage and NH3-sensitive sensing properties has been synthesized by one-step hydrothermal and in-situ growth technique, and their joint application in supercapacitor and NH3 sensing detection is realized. The 2D layered MoS2, produced by incorporating NH4+, possess a high specific surface area and numerous reactive sites, leading to the growth and polymerization of aniline between its layers. Because of the unique layered structure facilitating rapid reversible diffusion of charge ions, the energy storage properties of composites have been significantly improved, and the assembled asymmetric supercapacitors (ASC) can power a LED bulb for more than 20 minutes. Furthermore, due to the formation of p-n heterojunction and Schottky barrier between PANI and MoS2, as well as the enhancement of PANI's structure and dispersion via polystyrene sulfonic acid (PSS) along with nylon filter membrane, the resulting PANI-PSS@MoS2 sensing film shows outstanding ammonia sensitivity and excellent stability. Ultimately, the sensor film and LED bulb is powered by the ASC to achieve a semi-quantitative, real-time detection of NH3 concentration of spoiled food and exhaled gas of patients. The self-powered sensing device, utilizing PANI@MoS2, is anticipated to be an important candidate in flexible wearable sensing arena.