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Pd-modified SmFeO3 with hollow tubular structure under light shows extremely high acetone gas sensitivity

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Abstract

Currently, SmFeO3-based sensors are an effective platform for detecting acetone gas. However, they require high operating temperatures, which increases energy consumption and safety hazards, and their response is low when the gas concentration is at 10–9 (PPB), which cannot meet the requirements of using exhaled breath to pre-diagnose diabetes. Herein, Pd–SmFeO3 hollow nanotubes with an extremely high specific surface area and porosity were synthesized by electrospinning. After Pd doping, the specific surface area improved by more than two times, and the acetone response improved by more than three times. In addition, the response further improved by more than 1.5 times, and the optimum operating temperature reduced by 100 °C under light irradiation. Moreover, the relative humidity adaptability, long-term stability, and selectivity of the material were significantly improved after Pd doping or light irradiation. Finally, the acetone concentration in a person’s exhaled breath was detected by a Pd-SmFeO3-based gas sensor, and the error was less than 10% compared to that obtained by gas chromatography–mass spectrometry method.

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摘要

目前，基于SmFeO3的传感器是一种有效的丙酮气体检测平台。然而，它们需要较高的操作温度，这会增加能源消耗和安全隐患，当丙酮气体浓度在10-9级别时，响应较低，不能满足利用呼出气来预诊断糖尿病的要求。本文通过静电纺丝法合成了具有极高比表面积和孔隙率的Pd-SmFeO3空心纳米管。材料的比表面积提高了2倍以上，对丙酮气体的响应提高了3倍以上。在光照射下，响应进一步提高1.5倍以上，最佳工作温度降低100 ℃。此外，Pd掺杂或光照后材料的相对湿度适应性、长期稳定性和选择性均显著提高。最后，采用基于Pd-SmFeO3的气体传感器检测人呼出气体中的丙酮浓度，与气相色谱-质谱法相比，误差小于10%。本研究表明，Pd掺杂和光照射是提高材料气体灵敏度的两种有效方法，且利用丙酮气体传感器对糖尿病进行预诊断是可行和有效的。

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Acknowledgements

This study was financially supported by Shandong Natural Science Foundation (No. ZR2021QE265), the Fundamental Research Funds of Taishan University (No. Y–01–2020015), the National Natural Science Foundation of China (Nos. 61574098 and 61204051), Shandong Province Key Research and Development Program (No. 2019GGX101016).

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  1. College of Physics and Electronic Engineering, Taishan University, Taian, 271000, China

    Heng Zhang, Jing Xiao, Jun Chen, Lian Zhang & Yi Zhang

  2. School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang, 550025, China

    Xiang-Lin Pei

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Zhang, H., Xiao, J., Chen, J. et al. Pd-modified SmFeO3 with hollow tubular structure under light shows extremely high acetone gas sensitivity. Rare Met. 42, 545–557 (2023). https://doi.org/10.1007/s12598-022-02192-x

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