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Polypyrrole-Functionalized Silicon Nanowires for Isopropanol Sensing at Room Temperature

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Abstract

In order to enhance the sensing performance of isopropanol (IPA) vapor at room temperature (RT), a conducting polymer of polypyrrole (PPy) was employed to modify the ordered silicon nanowires (SiNWs). The loose structure of SiNWs which has the advantage of forming the structure of SiNWs uniformly coated by PPy was obtained via a dual-metal-assisted chemical etching (MACE) process. Vapor chemical polymerization of the pyrrole monomer (Py) was employed to prepare ultrathin PPy film uniformly functionalized SiNWs array, i.e., PPy@SiNWs. The results exhibit that an ultrathin PPy shell with thickness of 10 nm is wrapped on the surface of a loose SiNWs array forming perfect core-shell structure. Comparative investigations on the IPA-sensing properties of the PPy@SiNWs, SiNWs and PPy were carried out at RT. It shows that the as-formed PPy@SiNW sensor exhibits about a sevenfold response enhancement to 100 ppm IPA gas compared to the bare SiNWs. Moreover, the PPy@SiNW shows an acceptable stability, with a response attenuation of 8.9% observed within 33 days. The gas sensing results confirm that the PPy decoration can improve the sensing response and stability of the SiNW-based sensor.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 61971308, 61574100) and Tianjin National Natural Science Foundation of China (No.19JCZDJC30900)

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Authors and Affiliations

  1. School of Microelectronics, Tianjin University, Nankai District, 92 Weijin Road, Tianjin, 300072, China

    Yuxiang Qin, Xinyang Wang, Zhen Cui & Junsheng Zang

  2. Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin, 300072, China

    Yuxiang Qin

  3. Key Laboratory for Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Yuxiang Qin

Authors
  1. Yuxiang Qin
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  2. Xinyang Wang
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  3. Zhen Cui
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  4. Junsheng Zang
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Correspondence to Yuxiang Qin or Xinyang Wang.

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Qin, Y., Wang, X., Cui, Z. et al. Polypyrrole-Functionalized Silicon Nanowires for Isopropanol Sensing at Room Temperature. Journal of Elec Materi 50, 4540–4548 (2021). https://doi.org/10.1007/s11664-021-08988-4

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  • DOI: https://doi.org/10.1007/s11664-021-08988-4

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