Gas sensing properties of high energy facet exposed octahedral SnO2 nanoparticles

SnO2 octahedral nanoparticles exposed with high energy facet were synthesized by a simple hydrothermal technique. The microstructural analysis of the synthesized nanoparticles was carried out by field emission scanning electron microscopy (FE-SEM). X-ray diffraction (XRD) spectrum was used to analyze the crystal structure of the sample. Gas sensing properties of the sample were studied towards various reducing gases. The device fabricated using the sample showed a higher response to hydrogen sulphide (H2S) at an operating temperature of 200?. The lowest concentration, detectable at this operating temperature, is 1 ppm H2S gas. The device can be used for the identification of the presence of H2S in the exhaled breath for the early-stage detection of halitosis. The exhaled breath of halitosis patients contains 80 ppb-2 ppm of H2S.(c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the Second International Conference on Engineering Materials, Metallurgy and Manufacturing.

Automated summary

SnO2 octahedral nanoparticles with high energy facet were successfully synthesized using a simple hydrothermal technique. The microstructural analysis revealed the crystal structure of the sample. The gas sensing properties of the sample were investigated, and the device fabricated using the sample showed a higher response to hydrogen sulphide. Furthermore, the device can be used for the early-stage detection of halitosis by identifying the presence of hydrogen sulphide in exhaled breath.