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    High surface area carbonous components from emulsion derived SiOC and their gas sensing behavior
    (Elsevier Sci Ltd, 2015) Vakıfahmetoğlu, Cekdar; Buldu, Merve; Karakuscu, Aylin; Ponzoni, Andrea; Assefa, Dawit; Soraru, Gian Domenico
    A commercially available liquid polysiloxane polymer was emulsified via stirring in the presence of water and surfactant. After curing, porous microbead/capsule thermosets were obtained. The samples kept their shape upon pyrolysis and resulted in SiOC ceramics which were etched by hydrofluoric acid at room temperature. The specific surface area of the components increased considerably reaching to 310 m(2)/g when etching process was conducted. It was shown that the samples had hierarchical porosity including micro-meso and macro porosity (5-10 micron range). The etching process affected the conductivity and the room temperature NO2 sensing capability of the SiOC samples. It is shown that porous SiOC and carboneous materials produced via hydrofluoric acid etching, can be used to detect NO2 (5 ppm) at room temperature (for the etched sample) with an easy-to-read conductance (mS range) as well as fast response kinetics (few minutes) and a complete signal recovery. (C) 2015 Elsevier Ltd. All rights reserved.
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    SiC foams decorated with SnO2 nanostructures for room temperature gas sensing
    (Wiley, 2014) Karakuscu, Aylin; Ponzoni, Andrea; Comini, Elisabetta; Sberveglieri, Giorgio; Vakıfahmetoglu, Cekdar
    Cell walls of the commercial silicon carbide (SiC)-based foams were decorated by one-dimensional tin dioxide (SnO2) nanostructures. Thermal evaporation of SnO2 powder with the assistance of a Au catalyst in inert atmosphere caused the formation of SnO2 nanobelts on the pore surfaces. The room temperature (RT) ammonia (NH3) and nitrogen dioxide (NO2) gas sensing behaviors were investigated systematically in both dry and humid air atmosphere with/without UV activation. The results were compared to those for bare SnO2 and SiC. It was shown that SiC/SnO2 composite was efficient to detect low concentration of NH3 (10-50 ppm) and NO2 (1-5 ppm) under humid air and UV activation at RT.