TY - GEN A1 - Pašti, Igor A. A1 - Janošević Ležaić, Aleksandra A1 - Ćirić-Marjanović, Gordana A1 - Mirsky, Vladimir M. T1 - Resistive gas sensors based on the composites of nanostructured carbonized polyaniline and Nafion T2 - Journal of Solid State Electrochemistry N2 - 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 ethanol 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. Y1 - 2016 U6 - https://doi.org/10.1007/s10008-016-3344-y SN - 1433-0768 VL - 20 IS - 11 SP - 3061 EP - 3069 ER - TY - GEN A1 - Janošević Ležaić, Aleksandra A1 - Bajuk-Bogdanović, Danica A1 - Radoičić, Marija A1 - Mirsky, Vladimir M. A1 - Ćirić-Marjanović, Gordana T1 - Influence of synthetic conditions on the structure and electrical properties of nanofibrous polyanilines and their nanofibrous carbonized forms T2 - Synthetic Metals N2 - Nanofibrous polyanilines (PANIs) were synthesized by several oxidative polymerization pathways that have in common the presence of excess oxidant(s) (ammonium peroxydisulfate and its mixture with hydrogen peroxide), the absence of added acid, and the absence of external template (self-assembly process). Conducting forms of the synthesized PANI nanofibers (re)doped with various acids were further used as precursors for carbonization process to obtain nanofibrous carbonaceous materials (Carb-PANIs). Morphology, molecular structure, surface properties and electrical characteristics of PANI nanofibrous precursors and their carbonized counterparts were studied by scanning electron microscopy, Raman spectroscopy, by measurements of ζ-potential and determination of isoelectric points, as well as by measurements of electrical conductivity. Y1 - 2016 U6 - https://doi.org/10.1016/j.synthmet.2016.01.015 SN - 0379-6779 VL - 214 SP - 35 EP - 44 ER -