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I made two gas sensor: 1-pure SnO2 , 2-mixture of SnO2 and Beta zeolite. The response in the sensor1 is close to the same for ethanol and acetone. The response in sensor2 for ethanol is 5 times higher than the pure tin oxide sensor. The response in the tin oxide and beta zeolite combination sensor for acetone is 2 times higher than the pure tin oxide sensor. Describe the sensing mechanisms.
Accepted Answer
The enhanced response of the SnO2-beta zeolite sensor to ethanol compared to pure SnO2 suggests that the zeolite plays a role in selectively adsorbing and concentrating ethanol molecules. This increased concentration of ethanol near the SnO2 surface can lead to a higher response. Similarly, the increased response to acetone in the combined sensor indicates that the zeolite likely interacts with acetone molecules, potentially enhancing their adsorption onto the SnO2 surface. The difference in selectivity between the two sensors highlights the importance of the zeolite component in influencing the sensing behavior towards different analytes. It is likely that the beta zeolite has a higher affinity for ethanol than acetone, leading to a more pronounced enhancement in the response for ethanol.
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