Integrating zeolite nanoparticles with plasmonic waveguides for ellipsometric detection of acetone gas molecules

SENSORS AND ACTUATORS B-CHEMICAL

卷:344

Article

Ikeda, Mayuko¹  Matsui, Hiroaki^1,2  Yano, Yasuo¹  Yamahara, Hiroyasu²  Tabata, Hitoshi^1,2 

[1] Univ Tokyo, Dept Bioengn, Bunkyo Ku, 1-3-7 Hongo, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, 1-3-7 Hongo, Tokyo 1138656, Japan

关键词: Surface plasmon resonance;    Ellipsometry;    Waveguide;    Zeolite nanoparticle;    Acetone gas;    Phase difference;   

DOI  :  10.1016/j.snb.2021.130310

来源: Elsevier

【 摘 要 】

Improving our understanding of optical contributions can impact efforts to enhance the sensitivity of surface plasmon resonance (SPR) detection in the gas phase. In this study, we present a sensing strategy for amplifying detection signals by SPR planar waveguides integrated with nanoporous zeolite nanoparticles (NPs) owing to size matching between the zeolite pore and target gas molecule. This sensing technique can detect small changes in the refractive index (RI) by trapping gas molecules in zeolite NPs, which affect electromagnetic fields that are formed at surfaces of plasmonic waveguides. Gas detection based on phase differences of the SPR planar waveguides combined with spectroscopic ellipsometry provided high sensitivity at room temperature, and showed a reversible response to the powerful absorption of acetone gas into zeolite NPs. In addition, the propagation modes markedly affected changes in the phase difference of SPR planar waveguides, as determined by systematically controlling the layer thickness of the dielectric oxide core. This method allows for the optical detection of acetone gas concentrations down to sub-parts per million levels and highlights the potential use of optical gas sensors in a wide range of applications.

【 授权许可】

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