Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 3, Ehime, Matsuyama 790-8577, Japan.
Sensors (Basel). 2021 Nov 12;21(22):7522. doi: 10.3390/s21227522.
A highly sensitive NH gas sensor based on micrometer-sized polyaniline (PANI) spheres was successfully fabricated. The PANI microspheres were prepared via a facile in situ chemical oxidation polymerization in a polystyrene microsphere dispersion solution, resulting in a core-shell structure. The sensor response increased as the diameter of the microspheres increased. The PSt@PANI(4.5) sensor, which had microspheres with a 4.5 μm average diameter, showed the largest response value of 77 for 100 ppm dry NH gas at 30 °C, which was 20 times that of the PANI-deposited film-based sensor. Even considering measurement error, the calculated detection limit was 46 ppb. A possible reason for why high sensitivity was achieved is simply the use of micrometer-sized PANI spherical particles. This research succeeded in providing a new and simple technology for developing a high-sensitivity NH gas sensor that operates at room temperature.
基于微米级聚苯胺 (PANI) 球成功制备了一种高灵敏度 NH 气传感器。通过在聚苯乙烯微球分散溶液中进行简便的原位化学氧化聚合，制备了 PANI 微球，形成了核壳结构。传感器响应随微球直径的增加而增加。具有 4.5μm 平均直径的 PSt@PANI(4.5) 传感器在 30°C 下对 100ppm 干 NH 气体的最大响应值为 77，是沉积有 PANI 的薄膜基传感器的 20 倍。即使考虑测量误差，计算出的检测限也低至 46ppb。实现高灵敏度的一个可能原因是简单地使用了微米级的 PANI 球形颗粒。这项研究成功地为开发在室温下工作的高灵敏度 NH 气传感器提供了一种新的简单技术。
