Abstract
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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Acknowledgment
The present work was supported by the German Federal Ministry of Education and Research (Grant IWINDOR 040, Danube States R&D network project: “New materials and devices based on conducting polymers and their composites—POLYCON”) and the Ministry of Education, Science and Technological Development of the Republic of Serbia (project OI172043). An assistance of Dr. K. Tonder and Dr. Danica Bajuk-Bogdanović is acknowledged. We were happy to collaborate with Prof. George Inzelt within the POLYCON project. This work is dedicated to the 70th birthday of Prof. George Inzelt.
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Pašti, I.A., Janošević Ležaić, A., Ćirić-Marjanović, G. et al. Resistive gas sensors based on the composites of nanostructured carbonized polyaniline and Nafion. J Solid State Electrochem 20, 3061–3069 (2016). https://doi.org/10.1007/s10008-016-3344-y
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DOI: https://doi.org/10.1007/s10008-016-3344-y