Journal
METALS AND MATERIALS INTERNATIONAL
Volume 9, Issue 3, Pages 287-291Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/BF03027048
Keywords
polypyrrole; polyaniline; VOC; sensor; property
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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.
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