Traditional gas sensors are facing the challenge of low power consumption for future application in smart phones and wireless sensor platforms. To solve this problem, self-powered gas sensors are rapidly developed in recent years. However, all reported self-powered gas sensors are suffering from high limit of detection (LOD) toward NO gas. In this work, a photovoltaic self-powered NO gas sensor based on n-MoS /p-GaSe heterojunction is successfully prepared by mechanical exfoliation and all-dry transfer method. Under 405 nm visible light illumination, the fabricated photovoltaic self-powered gas sensors show a significant response toward ppb-level NO with short response and recovery time and high selectivity at room temperature (25 °C). It is worth mentioning that the LOD toward NO of this device is 20 ppb, which is the lowest of the reported self-powered room-temperature gas sensors so far. The discussed devices can be used as building blocks to fabricate more functional Internet of things devices.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292907 | PMC |
| http://dx.doi.org/10.1002/advs.202100472 | DOI Listing |
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