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Gas Sensors Based on Conducting Polymers

View Article: PubMed Central

ABSTRACT

The gas sensors fabricated by using conducting polymers such as polyaniline (PAni), polypyrrole (PPy) and poly (3,4-ethylenedioxythiophene) (PEDOT) as the active layers have been reviewed. This review discusses the sensing mechanism and configurations of the sensors. The factors that affect the performances of the gas sensors are also addressed. The disadvantages of the sensors and a brief prospect in this research field are discussed at the end of the review.

No MeSH data available.


Structure (A) and protonic acid doping process (B) of PAni.
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f15-sensors-07-00267: Structure (A) and protonic acid doping process (B) of PAni.

Mentions: For PAni, the doping process is different. PAni structure shown in Scheme 1 is in a totally reduced state. Generally, PAni chains consist of two types of structural units: Quiniod and Benzenoid (Scheme 3A). These two units can be transformed into each other by redox. Not all types of doped PAni are conductors; the protonated PAni is electrically conductive only when x:y=l:l (Benzenoid: Quiniod=3:l). The protonic acid doping process is illustrated in Scheme 3B. Doping and undoping play key roles in the sensing mechanism of conducting polymer based sensors.


Gas Sensors Based on Conducting Polymers
Structure (A) and protonic acid doping process (B) of PAni.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3756721&req=5

f15-sensors-07-00267: Structure (A) and protonic acid doping process (B) of PAni.
Mentions: For PAni, the doping process is different. PAni structure shown in Scheme 1 is in a totally reduced state. Generally, PAni chains consist of two types of structural units: Quiniod and Benzenoid (Scheme 3A). These two units can be transformed into each other by redox. Not all types of doped PAni are conductors; the protonated PAni is electrically conductive only when x:y=l:l (Benzenoid: Quiniod=3:l). The protonic acid doping process is illustrated in Scheme 3B. Doping and undoping play key roles in the sensing mechanism of conducting polymer based sensors.

View Article: PubMed Central

ABSTRACT

The gas sensors fabricated by using conducting polymers such as polyaniline (PAni), polypyrrole (PPy) and poly (3,4-ethylenedioxythiophene) (PEDOT) as the active layers have been reviewed. This review discusses the sensing mechanism and configurations of the sensors. The factors that affect the performances of the gas sensors are also addressed. The disadvantages of the sensors and a brief prospect in this research field are discussed at the end of the review.

No MeSH data available.