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Fabrication of MoSe2–Graphene Hybrid Nanoflakes for Toxic Gas Sensor with Tunable Sensitivity
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-04-30 , DOI: 10.1002/admi.202000140 Keerti Rathi 1 , Kaushik Pal 1, 2
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-04-30 , DOI: 10.1002/admi.202000140 Keerti Rathi 1 , Kaushik Pal 1, 2
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In this work, a selective chemi‐resistive gas sensor of molybdenum diselenide/graphene (MoSe2/G) nanoflakes (NF) that detects ammonia (NH3) and nitrogen dioxide (NO2) gas at room temperature is successfully fabricated. The MoSe2/G NF based sensor shows good sensitivity (2.476 ppm−1) and selectivity to NO2 in comparison with some VOCs and toxic gases than MoSe2 NF (2.275 ppm−1). But in case of NH3 gas, it shows a drastic increase in sensitivity of MoSe2/G NF (9.115 ppm−1) than MoSe2 NF (2.466 ppm−1). The MoSe2/G NF shows a low detection limit (11 ppb for NH3 and 41 ppb for NO2), an outstanding repeatability, and a reliable long‐term device durability (more than eight weeks) significantly. The reason of the significant improvement in gas sensing performance can be attributed mainly due to the addition of graphene in MoSe2 NF which in turns increases the surface‐to‐volume ratio. It encourages the adsorption of gas molecules on the surface of the material, thereby facilitating the charge transfer process. The superior performance of this gas sensor makes MoSe2/G NF a potential candidate for NO2 and NH3 gas detection at room temperature. Due to the presence of graphene, MoSe2 NF becomes less hydrophilic which shows very less effect of humidity effect.
中文翻译：
具有可调灵敏度的有毒气体传感器的MoSe2-石墨烯杂化纳米薄片的制备
在这项工作中，成功地制造了一种选择性的耐化学腐蚀的二硒化钼/石墨烯（MoSe 2 / G）纳米薄片（NF）气体传感器，该传感器可在室温下检测氨（NH 3）和二氧化氮（NO 2）气体。与MoSe 2 NF（2.275 ppm -1）相比，与某些VOC和有毒气体相比，基于MoSe 2 / G NF的传感器显示出良好的灵敏度（2.476 ppm -1）和对NO 2的选择性。但在使用NH 3气体的情况下，与MoSe 2 NF（2.466 ppm -1）相比，MoSe 2 / G NF（9.115 ppm -1）的灵敏度急剧增加。）。MoSe 2 / G NF的检测限低（NH 3的检测限为11 ppb，NO 2的检测限为41 ppb ），具有出色的可重复性，并且具有可靠的长期设备耐用性（超过八周）。气体传感性能显着改善的原因主要归因于在MoSe 2 NF中添加了石墨烯，这反过来又增加了表面体积比。它促进了气体分子在材料表面上的吸附，从而促进了电荷转移过程。这种气体传感器的优越性能使MoSe 2 / G NF成为NO 2和NH 3的潜在候选物室温下的气体检测。由于存在石墨烯，MoSe 2 NF的亲水性降低，这显示出湿度效应的影响非常小。
更新日期：2020-04-30
中文翻译：
具有可调灵敏度的有毒气体传感器的MoSe2-石墨烯杂化纳米薄片的制备
在这项工作中，成功地制造了一种选择性的耐化学腐蚀的二硒化钼/石墨烯（MoSe 2 / G）纳米薄片（NF）气体传感器，该传感器可在室温下检测氨（NH 3）和二氧化氮（NO 2）气体。与MoSe 2 NF（2.275 ppm -1）相比，与某些VOC和有毒气体相比，基于MoSe 2 / G NF的传感器显示出良好的灵敏度（2.476 ppm -1）和对NO 2的选择性。但在使用NH 3气体的情况下，与MoSe 2 NF（2.466 ppm -1）相比，MoSe 2 / G NF（9.115 ppm -1）的灵敏度急剧增加。）。MoSe 2 / G NF的检测限低（NH 3的检测限为11 ppb，NO 2的检测限为41 ppb ），具有出色的可重复性，并且具有可靠的长期设备耐用性（超过八周）。气体传感性能显着改善的原因主要归因于在MoSe 2 NF中添加了石墨烯，这反过来又增加了表面体积比。它促进了气体分子在材料表面上的吸附，从而促进了电荷转移过程。这种气体传感器的优越性能使MoSe 2 / G NF成为NO 2和NH 3的潜在候选物室温下的气体检测。由于存在石墨烯，MoSe 2 NF的亲水性降低，这显示出湿度效应的影响非常小。
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