Gas Sensor with Different Morphology of PANI Layer

Abstract

This work presents the design of a polymer-film-based sensor for gas detection. Different types of polyaniline are used as active layers. The advantages of resistive sensors with PANI layers are easy preparation and low production cost. At room temperature, polymer films have a high sensitivity to gas concentrations. The developed sensor works on the idea of electrical resistance shifting with gas concentration. Three different polymerization solutions are employed to synthesize the polyaniline (PANI) active layers (aqueous solution, sulfuric acid solution, and acetic acid solution). Active layers are evaluated in a controlled environment for their ability to detect ammonia, carbon monoxide, nitrogen monoxide, acetone, toluene, and relative humidity in synthetic air. PANI layers polymerized in acetic acid solutions exhibit good sensitivity toward ammonia.

Room Temperature NH3 Selective Gas Sensors Based on Double-Shell Hierarchical SnO2@polyaniline Composites

“…Conductive polymers [ 1 ], owing to their mild synthesis conditions, high conductivity, and specific recognition capabilities towards target gases, have significant appeal in the field of gas sensors [ 2 , 3 , 4 ]. In particular, PANI is unique among the conductive polymers and is considered to be the most promising material for ammonia detection at room temperature owing to its specific deprotonation/protonation process for NH 3 [ 5 , 6 , 7 ].…”

In situ synthesis of long tubular water-dispersible polyaniline with core/shell gold and silver@graphene oxide nanoparticles for gas sensor application

“…Therefore, soft templates, including micelles [ 11 ], vesicles [ 8 ], PANI oligomers [ 9 , 10 ], carbon nanotubes (CNT) [ 17 ], biological molecules like vitamin C [ 18 ], reactive oxide templates [ 19 ], and emulsifiers [ 20 ], have gained preference due to their controllable properties. Research findings indicate that the utilization of PANI in nanoparticle, nanofiber, nanowire, and nanotube forms has been proposed to enhance sensor response times by increasing the surface-to-volume ratio [ 21 , 22 ]. Furthermore, PANI nanocomposites, combining the advantages of both inorganic materials and PANI, have exhibited remarkable responses to gases such as hydrogen sulfide (H 2 S), ammonia (NH 3 ), hydrogen (H 2 ), nitrogen dioxide (NO 2 ), hydrochloric acid (HCl), sulfur dioxide (SO 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ), and other volatile organic compounds (VOCs) [ [23] , [24] , [25] ].…”

Pani-Based Nanocomposites for Electrical Applications: A Review

“…The entirely reduced form is called lucoemeraldine (LB), the half-oxidized form is called emeraldine (EB green), and the oxidized form is called pernigraniline violet color (PB). Contrary to other conducting polymers, PANI's conductivity can be adjusted by adjusting the levels of protonation and oxidation (Goswami, Nandy, Fortunato, & Martins, 2023;Kroutil, Laposa, Povolny, Klimsa, & Husak, 2023).…”