Efficient Formaldehyde Gas Sensing Performance via Promotion of Oxygen Vacancy on In-Doped LaFeO₃ Nanofibers.

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanomaterials Pub Date : 2024-10-02 DOI:10.3390/nano14191595

Lei Zhu, Jiaxin Zhang, Jianan Wang, Jianwei Liu, Wei Zhao, Wei Yan

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Abstract

Perovskite oxide LaFeO₃(LFO) emerges as a potential candidate for formaldehyde (HCHO) detection due to its exceptional electrical conductivity and abundant active metal sites. However, the sensitivity of the LFO sensor needs to be further enhanced. Herein, a series of La_xIn_1-xFeO₃ (x = 1.0, 0.9, 0.8, and 0.7) nanofibers (L_xIn_1-xFO NFs) with different ratios of La/In were obtained via the electrospinning method followed by a calcination process. Among all these L_xIn_1-xFO NFs sensors, the sensor based on the L_0.8In_0.2FO NFs possessed the maximum response value of 18.8 to 100 ppm HCHO at the operating temperature of 180 °C, which was 4.47 times higher than that based on pristine LFO NFs (4.2). Furthermore, the L_0.8In_0.2FO NFs sensor also exhibited a rapid response/recovery time (2 s/22 s), exceptional repeatability, and long-term stability. This excellent gas sensing performance of the L_0.8In_0.2FO NFs can be attributed to the large number of oxygen vacancies induced by the replacement of the A-site La³⁺ by In³⁺, the large specific surface area, and the porous structure. This research presents an approach to enhance the HCHO gas sensing capabilities by adjusting the introduced oxygen vacancies through the doping of A-sites in perovskite oxides.

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通过促进掺杂 LaFeO3 纳米纤维上的氧空位实现高效甲醛气体传感性能

透镜氧化物 LaFeO3（LFO）因其优异的导电性和丰富的活性金属位点而成为检测甲醛（HCHO）的潜在候选物质。然而，LFO 传感器的灵敏度有待进一步提高。本文通过电纺丝法和煅烧法获得了一系列具有不同 La/In 比例的 LaxIn1-xFeO3 （x = 1.0、0.9、0.8 和 0.7）纳米纤维（LxIn1-xFO NFs）。在所有这些 LxIn1-xFO NFs 传感器中，基于 L0.8In0.2FO NFs 的传感器在 180 °C 工作温度下对 100 ppm HCHO 的最大响应值为 18.8，是基于原始 LFO NFs 的传感器（4.2）的 4.47 倍。此外，L0.8In0.2FO NFs 传感器还具有快速响应/恢复时间（2 秒/22 秒）、优异的重复性和长期稳定性。L0.8In0.2FO NFs 的优异气体传感性能可归因于 In3+ 取代 A 位 La3+ 所产生的大量氧空位、大比表面积和多孔结构。本研究提出了一种通过掺杂过氧化物氧化物中的 A 位来调整引入的氧空位，从而增强 HCHO 气体传感能力的方法。

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

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.