Chemiresistive polyaniline-based gas sensors: A mini review

Abstract

This review focuses on some recent advances made in the field of gas sensors based on polyaniline [PANI], a conducting polymer with excellent electronic conductivity and electrochemical properties. Conducting polymers represent an important class of organic materials with an enhanced resistivity towards external stimuli. Among them, PANI polymers have attracted wide interest because of the versatility in their use, combined with the easy of synthesis, high yield and good environmental stability, together with a favorable response to guest molecules at room temperature. Moreover, PANI can be shaped into various structures with different morphologies and the possibility of obtaining nanofibers, in addition to thin films, has opened a rapid development of ultrasensitive chemical sensors, with improved processability and functionality. This review provides a brief description of the current status of gas chemiresistive sensors based on polyaniline and highlights the properties and applications of these devices in diverse range of application

B 36 borophene as an electronic sensor for formaldehyde: Quantum chemical analysis

“…In experimental works, the sensitivity of an electronic sensor toward a chemical is measured regarding the electrical conductance change after the adsorption process [53][54][55][56]. In theoretical studies, the electrical conductance has been commonly simulated by the HOMO-LUMO gap (E g ) change of semiconductor sensor based on the following equation [57]: σ = AT 3/2 exp(−E g /2kT ) (4) where k is the Boltzmann's constant and A (electrons/m 3 K 3/2 ) is a constant.…”

Structural and Morphological Characteristics of Polyaniline Synthesized in Pilot Scale

“…Among conducting polymers, PAni has received wide-spread attention because of its outstanding properties including simple and reversible doping-dedoping chemistry, stable electrical conduction mechanisms, high environmental stability and ease of synthesis (MacDiarmid 2001;Fratoddi et al 2015).…”

Recent progress on nanostructured conducting polymers and composites: synthesis, application and future aspects

“…The limitations of metals themselves are their NP format, high operating temperatures and reduced long-term stability, which made a great challenge to use the metal particles for sensing platform alone. Therefore, to increase the sensitivity, integrating metals NPs with CPs has become an effective way due to their promising chemical specificities, high surface area, high electrical conductivities, shorter diffusion lengths and low temperature processability [28,276,277]. NCP-based sensors, which transform a chemical reaction into an electrical response, have been successfully utilized for monitoring organic and inorganic gases, including alcohols, ethers, ammonia, nitrogen, NO x , H 2 , H 2 S, SO 2 and CO.…”