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Gas Sensors Based on Conducting Polymers

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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.


Kretschmann-type configuration of surface-plasmon resonance sensor device.
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f9-sensors-07-00267: Kretschmann-type configuration of surface-plasmon resonance sensor device.

Mentions: Surface-plasmon resonance (SPR) is another method of vapor detection utilizing light. Surface plasma waves are collective oscillations of the free electrons at the boundary of metal and dielectric material; their quanta are known as surface plasmons. Any changes in the properties of the dielectric layer near the interface will influence the excitation of the plasmons [162]. Near the resonance angle, small change of the conditions (incidence angle) may cause the reflected intensity change acutely. A SPR sensor has a typical configuration illustrated in Figure 9 (Kretschmann-type configuration) [163]. On exposing to analytes, the minimum in the reflectance curve will shift, which indicates the existence of the analytes. The sensitivity of this type of sensors is high, but the detecting procedures are complicate.


Gas Sensors Based on Conducting Polymers
Kretschmann-type configuration of surface-plasmon resonance sensor device.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3756721&req=5

f9-sensors-07-00267: Kretschmann-type configuration of surface-plasmon resonance sensor device.
Mentions: Surface-plasmon resonance (SPR) is another method of vapor detection utilizing light. Surface plasma waves are collective oscillations of the free electrons at the boundary of metal and dielectric material; their quanta are known as surface plasmons. Any changes in the properties of the dielectric layer near the interface will influence the excitation of the plasmons [162]. Near the resonance angle, small change of the conditions (incidence angle) may cause the reflected intensity change acutely. A SPR sensor has a typical configuration illustrated in Figure 9 (Kretschmann-type configuration) [163]. On exposing to analytes, the minimum in the reflectance curve will shift, which indicates the existence of the analytes. The sensitivity of this type of sensors is high, but the detecting procedures are complicate.

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.