An ultra-sensitive ammonia sensor based on a quartz crystal microbalance using nanofibers overlaid with carboxylic group-functionalized MWCNTs

IF 3.6 3区化学 Q2 CHEMISTRY, ANALYTICAL

Analyst Pub Date : 2024-09-11 DOI:10.1039/D4AN01061B

Ahmad Hasan As'ari, Rizky Aflaha, Laila Katriani, Ahmad Kusumaatmaja, Iman Santoso, Rike Yudianti and Kuwat Triyana

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Abstract

Detecting ammonia at low concentrations is crucial in various fields, including environmental monitoring, industrial processes, and healthcare. This study explores the development and performance of an ultra-sensitive ammonia sensor using carboxylic group-functionalized multi-walled carbon nanotubes (f-MWCNTs) overlaid on polyvinyl acetate nanofibers coated on a quartz crystal microbalance (QCM). The sensor demonstrates high responsiveness, with a frequency shift response of over 120 Hz when exposed to 1.5 ppm ammonia, a sensitivity of 23.3 Hz ppm⁻¹ over a concentration range of 1.5–7.5 ppm, and a detection limit of 50 ppb. Additionally, the sensor exhibits a rapid response time of only 14 s, excellent selectivity against other gases, such as acetic acid, formaldehyde, methanol, ethanol, propanol, benzene, toluene, and xylene, and good stability in daily use. These characteristics make the sensor a promising tool for real-time ammonia detection in diverse applications.

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基于石英晶体微天平的超灵敏氨气传感器，使用了覆盖羧基官能化 MWCNT 的纳米纤维

检测低浓度氨在环境监测、工业过程和医疗保健等多个领域都至关重要。本研究探索了一种超灵敏氨气传感器的开发和性能，该传感器采用羧基功能化多壁碳纳米管（f-MWCNTs），覆在涂覆在石英晶体微天平（QCM）上的聚醋酸乙烯酯纳米纤维上。该传感器具有很高的响应性，当暴露在 1.5 ppm 的氨气中时，频移响应超过 120 Hz，在 1.5-7.5 ppm 的浓度范围内灵敏度为 23.3 Hz ppm-1，检测限为 50 ppb。此外，该传感器的快速反应时间仅为 14 秒，对其他气体（如醋酸、甲醛、甲醇、乙醇、丙醇、苯、甲苯和二甲苯）具有出色的选择性，并且在日常使用中具有良好的稳定性。这些特点使该传感器成为在各种应用中进行实时氨检测的理想工具。

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