Highly Sensitive Ammonia Gas Sensor Based on MWCNTs Saturated Fe2O3 Nanograins.

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-09-28 DOI:10.1021/acs.langmuir.5c02458

Mikayel Aleksanyan,Artak Sayunts,Gevorg Shahkhatuni,Zarine Simonyan,Davit Kananov,Andranik Grigoryan,Rima Papovyan,Dušan Kopecký

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引用次数: 0

Abstract

Ammonia has a wide range of applications in various branches of industry and technology; the detection of its low concentrations is a preventive method for ambient air quality pollution and a useful method for noninvasive diagnosis of kidney disease by monitoring in exhaled human breath. In this work, a high-performance ammonia sensor based on the Fe2O3/MWCNTs (multiwalled carbon nanotubes) material was produced by applying the e-beam deposition method. The morphology, composition, and chemical state of the Fe2O3/MWCNTs material were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy (Raman), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The gas-sensing behavior of the sensor to various concentrations of NH3 was measured at 200 °C, representing excellent gas response and sophisticated performance parameters. The low detection limit of the Fe2O3/MWCNTs sensor was 3 ppm of NH3, corresponding to the response value of 2.7. The promising values of the response and recovery times (40 and 25 s) confirmed the high speed of ammonia detection. Thus, the suggested Fe2O3/MWCNTs material that is sensitive to low concentrations of NH3 can be successfully used in a new generation of ammonia alarm systems.

查看原文本刊更多论文

基于MWCNTs饱和Fe2O3纳米颗粒的高灵敏度氨气传感器。

氨在各个工业和技术部门有着广泛的应用；低浓度检测是一种预防环境空气质量污染的方法，也是通过监测人体呼出气体对肾脏疾病进行无创诊断的有效方法。本文采用电子束沉积法制备了基于Fe2O3/MWCNTs（多壁碳纳米管）材料的高性能氨传感器。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散x射线能谱（EDX）、拉曼光谱（Raman）、傅里叶变换红外光谱（FTIR）和x射线光电子能谱（XPS）表征了Fe2O3/MWCNTs材料的形貌、组成和化学状态。在200℃下测量了该传感器对不同浓度NH3的气敏行为，具有优异的气体响应和完善的性能参数。Fe2O3/MWCNTs传感器的低检出限为3 ppm的NH3，对应的响应值为2.7。响应和恢复时间（40 s和25 s）的前景值证实了氨的高速检测。因此，建议的Fe2O3/MWCNTs材料对低浓度NH3敏感，可以成功地用于新一代氨报警系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).