Abstract
The sensing characteristics of conducting polymers to several volatile organic compounds were investigated with a UV-Vis-NIR spectrophotometer, dynamic contact angles measurement and scanning probe microscopy (SPM). When gases were absorbed, the polypyrrole (PPy) and polyaniline (PANi) exhibited positive and negative sensitivity, respectively. The PPy-based sensor demonstrated decreasing conductivity while the PANi sensor exhibited increasing conductivity when the polarity of the molecules absorbed increased. PPy film has an hydrophilic property while the PANi film a hydrophobic one. These changes in polymer conductivity, it is speculated, are due to the interruption of free carrier movement or the generation of polarons by the absorbed molecules.
| Original language | English |
|---|---|
| Pages (from-to) | 287-291 |
| Number of pages | 5 |
| Journal | Metals and Materials International |
| Volume | 9 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 2003 |
Keywords
- Polyaniline
- Polypyrrole
- Property
- Sensor
- VOC
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