Kuş Esra, Altındemir Gülay, Bostan Yusuf Kerem, Taşaltın Cihat, Erol Ayse, Wang Yue, Sarcan Fahrettin
Department of Physics, Faculty of Science, Istanbul University, Vezneciler, Istanbul 34134, Turkey.
Materials Institute, TUBITAK Marmara Research Center, Gebze, Kocaeli 41470, Turkey.
Nanomaterials (Basel). 2024 Apr 5;14(7):633. doi: 10.3390/nano14070633.
Significant progress has been made in two-dimensional material-based sensing devices over the past decade. Organic vapor sensors, particularly those using graphene and transition metal dichalcogenides as key components, have demonstrated excellent sensitivity. These sensors are highly active because all the atoms in the ultra-thin layers are exposed to volatile compounds. However, their selectivity needs improvement. We propose a novel gas-sensing device that addresses this challenge. It consists of two side-by-side sensors fabricated from the same active material, few-layer molybdenum disulfide (MoS₂), for detecting volatile organic compounds like alcohol, acetone, and toluene. To create a dual-channel sensor, we introduce a simple step into the conventional 2D material sensor fabrication process. This step involves treating one-half of the few-layer MoS₂ using ultraviolet-ozone (UV-O) treatment. The responses of pristine few-layer MoS₂ sensors to 3000 ppm of ethanol, acetone, and toluene gases are 18%, 3.5%, and 49%, respectively. The UV-O-treated few-layer MoS₂-based sensors show responses of 13.4%, 3.1%, and 6.7%, respectively. This dual-channel sensing device demonstrates a 7-fold improvement in selectivity for toluene gas against ethanol and acetone. Our work sheds light on understanding surface processes and interaction mechanisms at the interface between transition metal dichalcogenides and volatile organic compounds, leading to enhanced sensitivity and selectivity.
在过去十年中，基于二维材料的传感设备取得了重大进展。有机蒸汽传感器，特别是那些使用石墨烯和过渡金属二硫属化物作为关键组件的传感器，已展现出出色的灵敏度。这些传感器具有高活性，因为超薄层中的所有原子都暴露于挥发性化合物中。然而，它们的选择性需要改进。我们提出了一种新颖的气体传感设备来应对这一挑战。它由两个并排的传感器组成，这些传感器由相同的活性材料——少层二硫化钼（MoS₂）制成，用于检测酒精、丙酮和甲苯等挥发性有机化合物。为了制造双通道传感器，我们在传统的二维材料传感器制造过程中引入了一个简单步骤。这一步骤涉及使用紫外臭氧（UV-O）处理少层MoS₂的一半。原始少层MoS₂传感器对3000 ppm的乙醇、丙酮和甲苯气体的响应分别为18%、3.5%和49%。经UV-O处理的少层MoS₂基传感器的响应分别为13.4%、3.1%和6.7%。这种双通道传感设备对甲苯气体相对于乙醇和丙酮的选择性提高了7倍。我们的工作有助于理解过渡金属二硫属化物与挥发性有机化合物之间界面处的表面过程和相互作用机制，从而提高灵敏度和选择性。
