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Highly sensitive room-temperture NO2 gas sensor based on Bi2S3 nanorods

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Abstract

Bismuth sulfide (Bi2S3) is known for its remarkable sensitivity and stability, making it as an ideal material for gas sensor. Here, we present a highly sensitive room-temperature NO2 gas sensor by controlling the Bi2S3 nanorods morphology through hot injection method with varying Bi/S ratios (Bi/S = 1, Bi/S = 2, Bi/S = 4). The as-synthesized samples were subsequently spin-coated onto ceramic substrates to fabricate chemo-resistive gas sensors. TEM and XPS analyses revealed that with the increasing Bi/S ratio in the precursors leading to the nanorods aspect ratios enhancing and the generation of S vacancies facilitating. As a result, Bi2S3 nanorods with a Bi/S ratio of 4 exhibited higher carrier mobility and provided more accessible sites for gas molecules. The optimal sensor (Bi/S = 4) showed an impressive response of 12.2 for 10 ppm NO2, which is 4 times higher than the device of Bi/S = 1. It also demonstrated a fast response/recovery time of 39 s/696 s and a lower detection limit down to 120 ppb. These findings highlight the excellent gas sensitivity performance of Bi2S3 nanorods at room temperature and their potential for the development of energy-efficient and cost-effective gas sensors.

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The original data during the current study are available from the corresponding author at a reasonable request.

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Funding

Shandong Provincial Natural Science Foundation, China (No. ZR202112010027). National Natural Science Foundation of China (No. 62004100).

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Authors and Affiliations

  1. School of Information Science and Engineering, University of Jinan, Jinan, 250022, China

    Hao Kan, Wenhao Yang & Zilong Guo

  2. College of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing, 210023, China

    Min Li

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  1. Hao Kan
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  3. Zilong Guo
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  4. Min Li
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All authors contributed to the study’s conception and design. The processing of data was performed by all authors. All authors discussed the results and approved the final manuscript.

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Correspondence to Min Li.

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Kan, H., Yang, W., Guo, Z. et al. Highly sensitive room-temperture NO2 gas sensor based on Bi2S3 nanorods. J Mater Sci: Mater Electron 35, 331 (2024). https://doi.org/10.1007/s10854-024-12133-2

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