Ali Mir Sahanur, Ali Mir Sahidul, Mallick Subhasish, Bhandari Shubhranshu, Ali Mir Intaj, Hazra Subhenjit, Roy Bodhishatwa, Chattopadhyay Sanatan, Karmakar Srikanta, Chattopadhyay Dipankar
Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, Kolkata, West Bengal, 700106, India.
Department of Polymer Science and Technology, University of Calcutta, Kolkata, West Bengal, 700009, India.
Sci Rep. 2024 Sep 14;14(1):21469. doi: 10.1038/s41598-024-72632-4.
In general, defects are crucial in designing the different properties of two-dimensional materials. Therefore large variations in the electric and optical characteristics of two-dimensional layered molybdenum disulphide might be attributed to defects. This study presents the design of a temperature and nitrogen sensor based on few-layer molybdenum disulfide sheets (FLMS), which was developed from bulk MoS (BMS) through an exfoliation approach. The produced sulfur defect, molybdenum defect, line defect, and plane defect were characterized by scanning transmission electron microscopy (STEM), which substantially impacts the sensing characteristics of the resulting FLMS. Our theoretical analysis validates that the sulfur vacancies of the MoS lattice improve sensing performance by promoting effective charge transfer and surface interactions with target analytes. The FLMS-based sensor showed a high sensitivity for detecting nitrogen gas with a detection limit (LOD) of ~ 0.18 ppm. Additionally, temperature-detecting capabilities were assessed over various temperatures, showing outstanding stability and repeatability. To the best of our knowledge, this material is the first of its kind, demonstrating visible N gas sensing with chromic behaviour.
一般来说，缺陷在二维材料不同性质的设计中至关重要。因此，二维层状二硫化钼的电学和光学特性的巨大差异可能归因于缺陷。本研究展示了一种基于少层二硫化钼薄片（FLMS）的温度和氮传感器的设计，该薄片是通过从块状MoS（BMS）经剥离法制备而成。通过扫描透射电子显微镜（STEM）对所产生的硫缺陷、钼缺陷、线缺陷和面缺陷进行了表征，这些缺陷对所得FLMS的传感特性有重大影响。我们的理论分析证实，MoS晶格中的硫空位通过促进有效电荷转移以及与目标分析物的表面相互作用来提高传感性能。基于FLMS的传感器对氮气检测具有高灵敏度，检测限（LOD）约为0.18 ppm。此外，在不同温度下评估了温度检测能力，显示出出色的稳定性和重复性。据我们所知，这种材料是同类材料中的首例，展示了具有变色行为的可见氮气传感。
