In this study, we develop two different surface structures of gas sensors by using different substrates to dectect volatile organic compounds (VOCs) with different functional groups. The above two gas sensors detect gases with the reflective optical fiber, which can reduce the sensing range to be just a single light spot. The nanogold anodic aluminum oxide (AAO) sensor treated by heating detects eight organic gases, and the result shows good linearity and reproducibility. The range of detection limit is still much to be desired. In addition, the multilayer gold nanoparticles were coated on the inner surface of the glass capillary tube (i.d. 0.8 mm) by the self-assembled film reaction. The multilayer gold nanoparticles sensor is integrated into the gas chromatograph (GC) system to successfully detect sixteen organic gases. The results indicates that multilayer gold nanoparticles sensor has good reproducibility, sensitivity, and linearity. Besides, the multilayer gold nanoparticles sensor has been demonstrated better sensitivity for compounds with higher molecular weight, polarity, refractive index and boiling point. The detection limit of m-xylene and cyclohexanone can be below 20 ng. These sensor structures make possible for future miniaturization of LSPR detectors.
|Effective start/end date||2017/08/01 → 2018/07/31|
- gold naonparticles
- Localized Surface Plasmon Resonance
- anodic aluminum oxide
- Volatile Organic Compounds
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