Ammonia detection mechanism with polyacrylic acid sensitive layers: Field effect transduction

被引：19
|
作者：
Oprea, A [1 ]
Barsan, N [1 ]
Weimar, U [1 ]
机构：
[1] Inst Phys & Theoret Chem, D-72076 Tubingen, Germany
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2005年 / 111卷
关键词：
polyacrylic acid; Kelvin Probe; ammonia sensor;
D O I：
10.1016/j.snb.2005.05.002
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The origin of work-function (WF) changes induced in polyacrylic acid (PAA) layers deposited on metallic electrodes upon ammonia exposure is examined. The changes are recorded in experiments performed in Kelvin Probe (KP) set-ups. To understand and explain the origin of the signals, data gathered in gravimetric (QMB), morphology, direct Current (dc) conductance, 4 MHz conductance and 4 MHz capacitance investigations are also used. The origin of the measured KP effects seems to be the polymer-electrode interface enriched in target gas molecules by the absorption in the PAA film. In this context, the complex role of the polymer and background humidity is addressed. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：577 / 581
页数：5
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