Abstract : The aims of this thesis were to improve the manufacture of a colorimetric sensor microsystem, evaluate its suitability for the detection of toxic gases, and gain a better understanding of the phenomena that occur in these microsystems. The main aim was the development of miniaturized porous doped materials with molecules able to induce changing color by interacting with the target compound. To produce these materials, a sol-gel process was used with the integration of chromogenic probe molecules into the structure, and thanks to microfluidic technology, it was possible to produce a hundred
colorimetric beads per square centimeter to form a microsystem. Our work has improved the robustness of the process by modifying some parameters. Exposures were carried out to demonstrate the ability to detect toxic gases. The microsystems were exposed to the toxic gases by various means, and the color changes obtained were analyzed. Finally, by studying some of the key steps occurring in the microsystem, we have improved our understanding of the manufacturing process and the confined reactions.
Keywords : Chemical sensor ; Lab-on-chip ; Materials ; Optical detection