International Ukrainian-Belarusian Agreement

“Development and research of gas-sensing materials based on oxide semiconductors used as sensors for analyzing human exhaled air for medical diagnostic systems”

(principal investigator - Candidate of Sciences in Physical and Mathematical Sciences, Vitaliy Bilanych)

Duration of the project: November 2021 – December 2021

Purpose: to study the influence of technology, metal nanoparticles (Au, Pt, Pd) and laser irradiation on the gas sensitive parameters of active-type semiconductor sensors for diagnostic systems for analyzing human expired air.

Result: powders SnO2 and SnO2 - Au (Pt, Pd) have been synthesized for the production of gas sensors. It was found that the preliminary oxidation of SnSO4 powder with concentrated H2SO4 before the hydrolysis stage makes it possible to obtain SnO2 powder with an average particle size of 5.5 nm and a high surface area (70.4 m2 / g) after calcination at 600 ° C. Gas-sensitive composites SnO2-Au with Au sizes from 1.9 ± 0.1 to 3.5 ± 0.5 nm were prepared using various methods for the synthesis of gold nanoparticles. An increase in the sensor response to CO, CH4, and C2H5OH was observed when gold nanoparticles 1.9–3.5 nm in size were added to the SnO2⋅nH2O sol. The highest reaction o acetone was recorded by the SnO2-Au sensor (3.5 nm). It was found that the introduction of gold nanoparticles increases the sensitivity of sensors based on SnO2 to acetone. SnO2 sensors (0.2 wt% Au) have the highest threshold sensitivity to acetone vapor in air. They detect 0.1 ppm acetone in air.