Tiwari Manish Kumar, Kanwade Archana R, Rajore Shraddha M, Satrughna Jena Akash Kumar, Ito Yuta, Lee Hyunju, Ohshita Yoshio, Ogura Atsushi, Mali Sawanta S, Patil Jyoti V, Hong Chang Kook, Shirage Parasharam M
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India.
Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India.
ACS Appl Mater Interfaces. 2024 Sep 18;16(37):49520-49532. doi: 10.1021/acsami.4c10014. Epub 2024 Sep 5.
Recent trends in two-dimensional (2D) graphene have demonstrated significant potential for gas-sensing applications with significantly enhanced sensitivity even at room temperature. Herein, this study presents fabrication of distinctive gas sensor based on one-dimensional (1D) WO nanofibers decorated 2D graphene, specifically coated on copper (Cu)-based interdigitated electrodes formed by DC sputtering, which can selectively detect NO gas at room temperature. The sensor device fabricated using WO/Gr1.5% (i.e., WO nanofibers hybrid nanocomposite with 1.5 wt % graphene) displays excellent overall sensing performance at 27 °C (room temperature) with high response (∼150-160 times) to NO gas. The WO/Gr1.5%-based sensor device reflects the highly selective detection toward NO gas among various gases with quick response time of 3 s and speedy recovery in 6 s. The limit of detection of ∼0.3 ppm with excellent reproducibility and stability for 3 months in all weather conditions (tested in humidity conditions 20-97%) are superior features of the device under test. However, WO/Gr3% displayed higher selectivity for NO but resulted with comparatively reduced sensitivity than WO/Gr1.5% sensor. The enhanced sensing performance could be attributed to the graphene content to decorate the nanofibers on it, oxygen vacancies/defects, and the contacts between the sensing material and Cu. This favorable synthesis and properties of self-assembled hybrid composite materials provide a potential utilization for detecting NO gas in environmental safety inspection.
二维（2D）石墨烯的最新发展趋势表明，其在气体传感应用中具有巨大潜力，即使在室温下也具有显著增强的灵敏度。在此，本研究展示了一种独特气体传感器的制造方法，该传感器基于一维（1D）WO纳米纤维修饰的2D石墨烯，具体而言，是涂覆在通过直流溅射形成的铜（Cu）基叉指电极上，能够在室温下选择性检测NO气体。使用WO/Gr1.5%（即含有1.5 wt%石墨烯的WO纳米纤维杂化纳米复合材料）制造的传感器器件在27°C（室温）下表现出优异的整体传感性能，对NO气体具有高响应（约150 - 160倍）。基于WO/Gr1.5%的传感器器件在各种气体中对NO气体具有高度选择性检测，响应时间快至3秒，恢复时间为6秒。在所有天气条件下（在20 - 97%的湿度条件下测试），检测限约为0.3 ppm，具有出色的重现性和3个月的稳定性，这些都是被测器件的优越特性。然而，WO/Gr3%对NO显示出更高的选择性，但与WO/Gr1.5%传感器相比，灵敏度相对降低。传感性能的增强可归因于用于修饰其上纳米纤维的石墨烯含量、氧空位/缺陷以及传感材料与Cu之间的接触。这种自组装杂化复合材料的良好合成及性能为环境安全检测中检测NO气体提供了潜在的应用价值。
