WO 3 nano-rods sensitized with noble metal nano-particles for H 2 S sensing in the ppb range
Source abstract
Abstract
Abstract Hydrothermally grown hexagonal WO 3 nano-rods were sensitized by additional Pt and Au nano-particles. The size of the 20–29 nm noble metal nano-particles were stabilized with methoxy-polyethylene glycol, and their solution was mixed with the tungsten-oxide nano-rod suspension. Controlled sized suspension drops of activated and pure reference material were deposited on the top of micro-hotplate with gold interdigital electrodes on top. The gas sensitive properties were measured for NH 3 and H 2 S in a temperature range of 140–300 °C. Noble metal nano-particles multiplied the gas sensitivity for H 2 S, whereas no significant effect could be detected for NH 3 . With gold nano-particles a lower detection limit of 25 ppb could be achieved. The response time is in the range of 30–80 s, whereas typically 300 s is needed for complete recovery.
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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · Advanced Chemical Sensor Technologies
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