Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 20, Issue 11, Pages 3061-3069Publisher
SPRINGER
DOI: 10.1007/s10008-016-3344-y
Keywords
Gas sensing; Resistive sensors; Carbonized polyaniline; Nafion; Nanocomposite
Categories
Funding
- German Federal Ministry of Education and Research [IWINDOR 040]
- Ministry of Education, Science and Technological Development of the Republic of Serbia [OI172043]
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Due to constant necessity to have reliable and sensitive gas sensors in many contemporary technologies, there is a permanent need for development of new sensing platforms with good sensing properties. Here, we demonstrate a novel type of resistive gas sensors based on carbonized polyaniline/Nafion composites. The sensing mechanism of such sensors is based on the sorption of gases by the composites which induce Nafion swelling and decreasing of conductivity. Chemosensitive properties can be tuned by the (i) choice of carbon materials with different conductivities, (ii) Nafion content in the composite, and (iii) thickness of the composite layer. We have shown that the sensors respond to water, acetone, ethanol, and methanol vapors. For the last two cases, we have achieved high sensitivity, fast response, wide concentration range, and good recovery. The use of simultaneous two- and four-point techniques for these sensors provides an internal control of the sensor integrity.
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