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Information × Registration Number 0222U003075, 0120U103199 , R & D reports Title Development of "smart" microelectronic sensor for controlling the contents of explosive and harmful gases in the air of living rooms popup.stage_title Head Lytovchenko Volodymyr H., Доктор фізико-математичних наук Registration Date 18-02-2022 Organization VE Lashkarev Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine popup.description2  Carbon oxides, in particular carbon dioxide (CO2), have been linked to many adverse health effects [1-7]. Even in a relatively well-controlled indoor environment, the content of harmful impurities in the air can vary dramatically depending on the temperature and humidity level [8-17]. Thus, it is important to take into account these variables of the environment and to investigate the operation of the sensor in the range of potential conditions of the real environment. Thus, in 2021, the following scientific and technical work was carried out: 1) fabricated sensory structures based on porous silicon (electrochemical method in a mixture of HF / C2H5OH) with embedded nanoparticles of transition metals (Pd, Ni, WO3, Cu) deposited by the method magnetron sputtering followed by heat treatment; 2) a method of applying polymer films to the surface of sensitive electrodes was developed. Methanol, ethanol or dimethylformamide were used to make solutions of these polymers. The solution is applied to the surface of the sensitive electrode, followed by evaporation of the solvent at low heat. Polymers used and investigated (1) poly (ethyleneimine) (PEI); (2) nafion; (3) Nafion / TiO2. It was found that the best option is to use a mixture of polymers PEI / Nafion_TiO2. This may be due to the fact that PEI consists of several amine groups that interact well with carbon monoxide molecules. While the hydrophilic film Nafion / TiO2 absorbs water molecules well and is mechanically stable [18-24]. Thus, this leads to increased sensitivity of the sensor in conditions of high humidity. Sensor structures coated with a mixture of polymers have been found to be sensitive to CO2 in the range of 400 ppm (level of outdoor clean air / unfilled rooms - 1500 ppm (deteriorating health / occupancy ≥ 50%). Thus, the use of polymer film has improved determination of CO2 in the real environment and may be a potential future solution for CO2/CO monitoring in smart infrastructure. Product Description popup.authors Gorbanyuk Tetyana Ivanivna Kurchak Anatolii Ivanovych Shugaeva Lyubov Mykhilivna popup.nrat_date 2022-03-09 Close