Harnessing mixed-phase MoS2 for efficient room-temperature ammonia sensing

IF 5.8 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Nanoscale Pub Date : 2024-12-09 DOI:10.1039/D4NR03037K
M. A. Jalil, Kamrul Hassan, Anh Tuan Trong Tran, Tran Thanh Tung, Manas Ranjan Panda, Sally El Meragawi, Tetsuya Kida, Mainak Majumder and Dusan Losic
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Abstract

Molybdenum disulfide (MoS2), a notable two-dimensional (2D) material, has attracted considerable interest for its potential applications in gas sensing, despite its typically insulating characteristics, which have limited its practical use. In this study, we present the use of mixed phase MoS2 (1T@2H-MoS2) to overcome sensing limitations of MoS2 material by enhancing its conductivity and demonstrating its high-performance characteristics for sensing ammonia (NH3) at room temperature (20 °C). The 1T@2H-MoS2 was synthesized via a hydrothermal process, and the coexistence of two different phases (the 1T and 2H phases) was confirmed by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Raman spectroscopy. The flower-like morphology was confirmed by field emission scanning electron microscopy (FESEM) and TEM. Our results indicate that the presence of both 1T and 2H phases within the material introduces sulfur vacancies, which we propose are critical to significantly enhancing its sensitivity to NH3 gas. The ammonia-sensing performance of the 1T@2H-MoS2 material was evaluated, and it demonstrated rapid and selective detection of NH3 gas across a wide concentration range (2 ppm to 100 ppm), with a very swift response time (7 s), fast recovery and high selectivity at room temperature without requiring heating. This improvement is attributed to the increased conductivity and effective active sites provided by the sulfur defects. This study underscores the potential of mixed-phase MoS2 in developing rapidly responsive and highly selective NH3 sensors, paving the way for the safety monitoring of hazardous gases in various industrial settings.

Abstract Image

利用混合相MoS 2进行高效的室温操作氨传感
二硫化钼(MoS 2)是一种著名的二维(2D)材料,尽管其典型的绝缘特性限制了其实际应用,但由于其在气敏中的潜在应用而引起了相当大的兴趣。在这项研究中,我们提出使用MoS₂(1T@2H- MoS₂)的混合相来克服MoS₂材料的传感限制,通过增强其导电性并展示其在室温(20℃)下传感氨(NH₃)的高性能特性。采用水热法合成了1T@2H- MoS 2,并通过透射电镜(TEM)、x射线光电子能谱(XPS)、x射线衍射(XRD)和拉曼光谱(Raman spectroscopy)证实了两种不同相(1T相和2H相)的共存。通过场发射扫描电镜(FESEM)和透射电镜(TEM)证实了花状形貌。我们的研究结果表明,材料中1T和2H相的存在引入了硫空位,我们认为这对于显著提高其对NH₃气体的敏感性至关重要。对1T@2H- MoS₂材料的氨传感性能进行了评估,证明了在很宽的浓度范围内(2 ppm到100 ppm)快速和选择性地检测NH₃气体,在室温下具有非常快的响应时间(7秒),快速恢复和高选择性,而不需要加热。这种改进是由于硫缺陷增加了电导率和提供了有效的活性位点。这项研究强调了混合相MoS₂在开发快速响应和高选择性NH₃传感器方面的潜力,为各种工业环境中有害气体的安全监测铺平了道路。
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来源期刊
Nanoscale
Nanoscale CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
12.10
自引率
3.00%
发文量
1628
审稿时长
1.6 months
期刊介绍: Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.
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