Investigation of the Conformational Changes of a Conducting Polymer in Gas Sensor Active Layers by Means of Polarization-Modulation Infrared Reflection Absorption Spectroscopy (PM-IRRAS).

被引：15

作者：

Caseli, Luciano ^{[1
]}

Gruber, Jonas ^{[2
]}

Li, Rosamaria W. C. ^{[3
]}

Peres, Laura O. ^{[1
]}

机构：

[1] Univ Fed Sao Paulo, Lab Hybrid Mat, Diadema, SP, Brazil

[2] Univ Sao Paulo, Inst Chem, Sao Paulo, Brazil

[3] Univ Ctr Estacio Uniradial, Sao Paulo, Brazil

来源：

LANGMUIR | 2013年 / 29卷 / 08期

基金：

巴西圣保罗研究基金会;

关键词：

AIR; MONOLAYERS;

D O I：

10.1021/la3050797

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

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.

引用

页码：2640 / 2645

页数：6

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