PDF(Pubmed)
Abstract：
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-O3) 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-O3-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.
摘要：
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合物作为关键成分的，表现出优异的灵敏度。这些传感器是高度活跃的,因为超薄层中的所有原子都暴露于挥发性化合物。然而,它们的选择性需要改进。我们提出了一种新型的气体传感设备来解决这一挑战。它由两个由相同活性材料制成的并排传感器组成，少层二硫化钼(MoS2)，用于检测挥发性有机化合物，如酒精，丙酮,还有甲苯.要创建双通道传感器，我们在传统的2D材料传感器制造过程中引入了一个简单的步骤。此步骤涉及使用紫外线臭氧（UV-O3）处理处理几层MoS2的一半。原始的几层MoS2传感器对3000ppm乙醇的响应，丙酮,甲苯气体占18%,3.5%,49%,分别。经UV-O3处理的几层MoS2传感器的响应为13.4%，3.1%,和6.7%，分别。这种双通道传感装置证明了甲苯气体对乙醇和丙酮的选择性提高了7倍。我们的工作为了解过渡金属二硫属化合物与挥发性有机化合物之间界面的表面过程和相互作用机理提供了启示。导致增强的灵敏度和选择性。
