Preparation of Nanoporous Hybrid Materials with Bridged Tetra Sulfide Functional Groups and Determination of Their Sensing Characteristics Towards Relative Humidity
Nano porous hybrid materials were synthesized by co-condensation of organically bridged tetra sulfide bis [3-(triethoxysilyl) propyl] tetra sulfide (BTPTS) and tetra ethoxylsilane (TEOS) in the presence of the non-ionic surfactant triblock copolymer poly(ethylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol) (EO20PO70EO20) in acidic media as revealed by the measurement of nitrogen adsorption. The structure and chemical state of the materials were characterized by chemical analysis, Fourier–transform infrared spectroscopy (FTIR), 29Si MAS NMR, and thermo-gravimetric analysis (DTA/TG), revealing the integrity of organic groups inside the framework. The synthesized powders were prepared as sensors using the screen-printing technique and then evaluated on view of their sensing characteristics in the range from 0.0% to 96% relative humidity (RH) at room temperature. Sensors with a higher content of BTPTS show a better response towards RH.
KeywordsHybrid materials Nanoporous materials Porosity Relative humidity Screen-printing Sensors
The authors gratefully acknowledge Professor Jean Marc Tulliani from department of applied science and technology (DISAT), Politecnico di Torino, Turin, Italy, for working in his laboratory facilities for gas sensors testing and useful discussions.
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