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UV-Activated MoS2 Based Fast and Reversible NO2 Sensor at Room Temperature
ACS Sensors ( IF 8.2 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acssensors.7b00731
Rahul Kumar 1 , Neeraj Goel 1 , Mahesh Kumar 1
Affiliation  

Two-dimensional materials have gained considerable attention in chemical sensing owing to their naturally high surface-to-volume ratio. However, the poor response time and incomplete recovery at room temperature restrict their application in high-performance practical gas sensors. Herein, we demonstrate ultrafast detection and reversible MoS2 gas sensor at room temperature. The sensor’s performance is investigated to NO2 at room temperature, under thermal and photo energy. Incomplete recovery and high response time of ∼249 s of sensor are observed at room temperature. Thermal energy is enough to complete recovery, but it is at the expense of sensitivity. Further, under photo excitation, MoS2 exhibits an enhancement in sensitivity with ultrafast response time of ∼29 s and excellent recovery to NO2 (100 ppm) at room temperature. This significant improvement in sensitivity (∼30%) and response time (∼88%) is attributed to the charge perturbation on the surface of the sensing layer in the context of NO2/MoS2 interaction under optical illumination. Moreover, the sensor shows reliable selectivity toward NO2 against various other gases. These unprecedented results reveal the potential of 2D MoS2 to develop a low power portable gas sensor.

中文翻译:

室温下基于紫外线激活的基于MoS 2的快速和可逆NO 2传感器

二维材料由于其自然较高的表面积与体积之比,因此在化学传感领域引起了极大的关注。但是,较差的响应时间和室温下的不完全恢复限制了它们在高性能实用气体传感器中的应用。本文中,我们展示了室温下的超快检测和可逆MoS 2气体传感器。在室温下,在热能和光能下,对传感器的性能进行了研究,直至达到NO 2。在室温下,观察到传感器恢复不完全,响应时间高达249 s。热能足以完成恢复,但它是以牺牲灵敏度为代价的。此外,在光激发下,MoS 2表现出更高的灵敏度,超快响应时间约为29 s,在室温下极佳的NO 2(100 ppm)回收率。灵敏度(〜30%)和响应时间(〜88%)的显着提高归因于在光学照明下在NO 2 / MoS 2相互作用的情况下传感层表面的电荷扰动。此外,该传感器对各种其他气体显示出对NO 2的可靠选择性。这些空前的结果揭示了2D MoS 2开发低功率便携式气体传感器的潜力。
更新日期:2017-11-08
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