Inexpensive chemiresistive sensors are often insufficiently selective as they are sensitive to multiple components of the gas mixture at the same time. One solution would be to insert a device in front of the sensor that separates the measured gas mixture and possibly isolates the unwanted components. This study focused on the fabrication and characterization of a compact unit, which was fabricated by 3D printing, for the separation and detection of simple gas mixtures. The capillary, the basic part of the compact unit, was 4.689 m long and had a diameter of 0.7 mm. The compact unit also contained a mixing chamber on the inlet side and a measuring chamber with a MiCS-6814 sensor on the outlet side. Mixtures of ethanol and water at different concentrations were chosen for characterization. The measured calibration curve was found to have a reliability of R2 = 0.9941. The study further addressed the elements of environmental friendliness of the materials used and their sustainability.

Centre of Polymer Systems University Institute Tomas Bata University in Zlin Trida Tomase Bati 5678 760 01 Zlin Czech Republic

Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stranemi 4511 760 05 Zlin Czech Republic

Department of Food Analysis and Chemistry Faculty of Technology Tomas Bata University in Zlin Vavreckova 5669 760 01 Zlin Czech Republic

Department of Food Technology Faculty of Technology Tomas Bata University in Zlin Vavreckova 5669 760 01 Zlin Czech Republic

Department of Microelectronics Faculty of Electrical Engineering and Communication Brno University of Technology Technicka 3058 10 616 00 Brno Czech Republic

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Optimizing Low-Cost Gas Analysis with a 3D Printed Column and MiCS-6814 Sensor for Volatile Compound Detection