Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Improving Hazardous Gas Detection Behavior with Palladium Decorated Sno2 Nanobelts Networks

Version 1 : Received: 11 August 2022 / Approved: 16 August 2022 / Online: 16 August 2022 (07:43:01 CEST)

How to cite: Araújo, E.P.D.; Paiva, M.P.; Blanco, K.C.; Chiquito, A.J.; Amorim, C.A. Improving Hazardous Gas Detection Behavior with Palladium Decorated Sno2 Nanobelts Networks. Preprints 2022, 2022080281 (doi: 10.20944/preprints202208.0281.v1). Araújo, E.P.D.; Paiva, M.P.; Blanco, K.C.; Chiquito, A.J.; Amorim, C.A. Improving Hazardous Gas Detection Behavior with Palladium Decorated Sno2 Nanobelts Networks. Preprints 2022, 2022080281 (doi: 10.20944/preprints202208.0281.v1).

Abstract

When present in specific amounts in the air, the colorless, odorless, and tasteless gases monoxide and carbon dioxide may either replace oxygen in red blood cells (CO) or increase the respiratory rate causing cardiac arrhythmias (CO2), leading to death. Commercial sensors take around 8 h to detect levels of CO (50 PPM), causing moderate poisoning. SnO2 presents controlled interactions with the atmosphere using conductance and vacancy adjustments to capture electrical properties. However, the selectivity of gas detection by SnO2 can still be improved, thus also increasing the application possibilities. The present study aimed to optimize the sensing of CO and CO2 in SnO2 using palladium functionalization. The vapor-liquid-solid method synthesized a network of SnO2 nanobelts decorated with palladium nanoparticles. The sensitivity of the sensors for CO and CO2 were evaluated, characterizing parameters such as response time, a wide range of CO and CO2 concentrations, and temperature. In the seventh measurement cycle, the sensor response for different concentrations of gases in consecutive cycles showed a sensitivity of up to 125% for CO in 60 s. Furthermore, we observed increased sensor sensitivity with material doping with nanoparticles from 130 ppm to 1360 ppm in 30 seconds to CO. Conclusion: The results provide a better understanding of the sensitivity of SnO2 in palladium-decorated nanoparticles, offering insights for detecting low CO concentrations quickly. The behavior of these doped nanosensors showed us the importance of considering them as a practical possibility for detecting these gases of importance to human health.

Keywords

nanobelts; tin oxide; gas sensor; carbon monoxide; carbon dioxide; CO; CO2

Subject

MATERIALS SCIENCE, Nanotechnology

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