Abstract
WO3 nano-structured layers on top of micro-hotplates were formed by sol–gel deposition technique and electrochemical anodic etching of thin tungsten layers. Both types of gas sensing layers were activated by drop coated Pt nano-particles and alternatively, by atomic layer deposited (ALD) Pt. Due to the limited number of ALD cycles the Pt layer is not a contiguous but composed of uniformly distributed nano-particles of 2–3 nm size. Devices were characterized by their responses for exposure of H2S and NH3. Investigation of sensitivity, selectivity and device dynamics revealed that the ALD sensitized, electrochemically formed porous WO3 layer is suitable for quick detection of H2S.
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Acknowledgements
The authors thank for the assistance of Dr. Zsolt Czigány and Dr. Z. György Radnóczi with HRTEM analysis and Mr. Levente Illés with SEM characterization. The technical support of Ms. Margit Payer and Mr. Attila Nagy is also acknowledged.
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Takács, M., Dücső, C. & Pap, A.E. Nano-structured WO3 layers sensitized with ALD Pt for quick detection of H2S. J Mater Sci: Mater Electron 28, 17148–17155 (2017). https://doi.org/10.1007/s10854-017-7642-7
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DOI: https://doi.org/10.1007/s10854-017-7642-7