Journal
LANGMUIR
Volume 29, Issue 8, Pages 2640-2645Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la3050797
Keywords
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Funding
- FAPESP
- CAPES-INCT (Eletronica Organica)
- CAPES-nBioNet (Films and Sensors)
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Polarization-Modulation Infrared Reflection Absorption Spectroscopy (PM-IRRAS) was employed to observe the changes in the molecular conformation of poly(2-phenyl-1,4-xylylene) (PPPX) films that occurred after exposure to organic solvent vapors. The PPPX films were supported on solid matrixes by casting, spin-coating, and Langmuir-Blodgett (LB) techniques. The results show that the polymer is sensitive to the solvent vapors, which affect some of the vibration dipole moments, as detected by PM-IRRAS. The sensitivity depends on the method employed to immobilize the polymer, with more significant changes in films formed using techniques that result in a less systematically organized conformation. This feature enables the use of surface vibration spectroscopy to detect organic solvent vapors and may be applied in an artificial nose.
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