Enhanced formaldehyde gas sensing properties of p-LaFeO3/n-Fe2O3 composite nanofibers synthesized by electrospinning method

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2024-11-29 DOI:10.1016/j.snb.2024.137010

Buting Sun , Miao Liu , Qi Wang , Peng Song

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Abstract

Formaldehyde sensors play a key role in indoor and outdoor air quality detection. In this study, LaFeO₃/Fe₂O₃ composite nanofiber sensor with heterogeneous structure was prepared by electrospinning technology. Compared with LaFeO₃ nanofibers, the diameter of LaFeO₃/Fe₂O₃ composite nanofibers is reduced from 200 nm to about 180 nm, and the surface micro-cracks become more compact. The gas-sensing test results showed that the response value of LaFeO₃/Fe₂O₃ composite nanofibers was significantly improved compared with pure LaFeO₃. In particular, the S3 (LaFeO₃:Fe₂O₃=10:1) sensor has a response value of 38.46, and its optimal operating temperature is reduced from the original 180 ℃ to 120 ℃, which further broadens its practical application range. On this basis, the sensing mechanism is discussed in detail by surface oxygen adsorption and space charge model, and the density functional theory (DFT) is used to analyze the sensing mechanism. The improvement of the response value is mainly attributed to the unique morphology, abundant oxygen vacancy, large specific surface area and the formation of p-n heterojunction. This study provides experimental basis and theoretical support for the preparation of high-performance LaFeO₃-based gas sensors.

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静电纺丝法合成的p-LaFeO3/n-Fe2O3复合纳米纤维的甲醛气敏性能增强

甲醛传感器在室内外空气质量检测中起着关键作用。本研究采用静电纺丝技术制备了具有非均相结构的LaFeO3/Fe2O3复合纳米纤维传感器。与LaFeO3纳米纤维相比，LaFeO3/Fe2O3复合纳米纤维的直径从200 nm减小到180 nm左右，表面微裂纹变得更加致密。气敏测试结果表明，与纯LaFeO3相比，LaFeO3/Fe2O3复合纳米纤维的响应值显著提高。特别是S3 （LaFeO3:Fe2O3=10:1）传感器的响应值为38.46，其最佳工作温度由原来的180℃降低到120℃，进一步拓宽了其实际应用范围。在此基础上，通过表面氧吸附和空间电荷模型详细讨论了感应机理，并利用密度泛函理论（DFT）分析了感应机理。响应值的提高主要是由于其独特的形貌、丰富的氧空位、较大的比表面积和p-n异质结的形成。本研究为制备高性能lafeo3基气体传感器提供了实验依据和理论支持。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.