Electrical conductivity of polyaniline/zeolite composites and synergetic interaction with CO

A layered surface acoustic wave gas sensor based on a polyaniline/In2O3nanofibre composite

“…There are several approaches to reduce these limitations, such as the use of catalysts and promoters, multi-sensor array systems and intelligent signal processing. The increase of the nanocomposite conductivity upon exposure to CO can be similarly described as a conductivity increase due to interaction of polyaniline with CO [25][26]. A plausible sensing mechanism involves activation of CO, which is helped by In 2 The conductivity of a polyaniline/In 2 O 3 film also increases with NO 2 exposure, which indicates that this gas acts as a dopant for the composite.…”

Interaction of carbon monoxide with PEDOT-PSS/zeolite composite: effect of Si/Al ratio of ZSM-5 zeolite

“…Various polymeric materials have been investigated as CO gas sensing materials due to their acid-base or oxidizing characteristics. The unique doping process of a conductive polymer makes it favorable towards the sensing characteristics, but the conductive polymer still has poor selectivity towards gaseous analyzes [5][6][7][8]. The ultimate desired characteristics of gas sensors are: accuracy, reliability, selectivity, sensitivity, rapid responsibility, miniaturization capability, stability and low cost.…”

“…Recently, zeolites have been used in gas sensor applications in combination with conductive polymers [8,[20][21][22]. Because of the well-defined structure of a zeolite, it can separate the desired gas molecule from others and the presence of a cation in the cavity also facilitates gas interactions.…”

A novel approach for Zeolite-based Materials for Gas Sensors

“…As a result, a CO selective gas sensor was obtained, which has a sensitivity towards CO over ten times higher than that towards other gases at about 573K [13]. A composite polyaniline/zeolite material can also be used as a CO sensor [14]. The material exhibits an electrical conductivity response to CO, which is related to the content, pore size and ion exchange capacity of the zeolite, dopant type and concentration.…”