CO gas sensing by ultrathin tin oxide films grown by atomic layer deposition using transmission FTIR spectroscopy

The Journal of Physical Chemistry. a
X DuSteven M George

Abstract

Ultrathin tin oxide films were deposited on SiO2 nanoparticles using atomic layer deposition (ALD) techniques with SnCl4 and H2O2 as the reactants. These SnO(x) films were then exposed to O2 and CO gas pressure at 300 degrees C to measure and understand their ability to serve as CO gas sensors. In situ transmission Fourier transform infrared (FTIR) spectroscopy was used to monitor both the charge conduction in the SnO(x) films and the gas-phase species. The background infrared absorbance measured the electrical conductivity of the SnO(x) films based on Drude-Zener theory. O2 pressure was observed to decrease the SnO(x) film conductivity. Addition of CO pressure then increased the SnO(x) film conductivity. Static experiments also monitored the buildup of gas-phase CO2 reaction products as the CO reacted with oxygen species. These results were consistent with both ionosorption and oxygen-vacancy models for chemiresistant semiconductor gas sensors. Additional experiments demonstrated that O2 pressure was not necessary for the SnO(x) films to detect CO pressure. The background infrared absorbance increased with CO pressure in the absence of O2 pressure. These results indicate that CO can produce oxygen vacancies on the SnO(x) surfa...Continue Reading

References

Sep 7, 2006·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Alexander Gurlo
Apr 21, 2007·Angewandte Chemie·Alexander Gurlo, Ralf Riedel

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Citations

Jan 27, 2012·Advanced Materials·Catherine MarichyNicola Pinna
May 26, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·James D ParishGabriele Kociok-Köhn
Sep 11, 2018·ACS Applied Materials & Interfaces·Jung-Hoon LeeJin-Seong Park
Aug 17, 2018·ACS Applied Materials & Interfaces·Yinghuan KuangMariadriana Creatore
Feb 13, 2019·The Journal of Physical Chemistry. a·Robin P HarkinsWayne L Gladfelter

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