High-Performance Atomically-Thin Room-Temperature NO2 Sensor

The development of room-temperature sensing devices for detecting small concentrations of molecular species is imperative for a wide range of low-power sensor applications. We demonstrate a room-temperature, highly sensitive, selective, stable, and reversible chemical sensor based on a monolayer of...

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Bibliographic Details
Published in:Nano letters 2020-08, Vol.20 (8), p.6120-6127
Main Authors: Azizi, Amin, Dogan, Mehmet, Long, Hu, Cain, Jeffrey D, Lee, Kyunghoon, Eskandari, Rahmatollah, Varieschi, Alessandro, Glazer, Emily C, Cohen, Marvin L, Zettl, Alex
Format: Article
Language:English
Subjects:
layer-dependent electrical properties
OTHER INSTRUMENTATION
room-temperature sensor
transition-metal dichalcogenides
two-dimensional materials
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Summary:The development of room-temperature sensing devices for detecting small concentrations of molecular species is imperative for a wide range of low-power sensor applications. We demonstrate a room-temperature, highly sensitive, selective, stable, and reversible chemical sensor based on a monolayer of the transition-metal dichalcogenide Re0.5Nb0.5S2. The sensing device exhibits a thickness-dependent carrier type, and upon exposure to NO2 molecules, its electrical resistance considerably increases or decreases depending on the layer number. The sensor is selective to NO2 with only minimal response to other gases such as NH3, CH2O, and CO2. In the presence of humidity, not only are the sensing properties not deteriorated but also the monolayer sensor shows complete reversibility with fast recovery at room temperature. We present a theoretical analysis of the sensing platform and identify the atomically sensitive transduction mechanism.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.0c02221