ABSTRACT Optical waveguide (OWG) sensors present great potential for detecting trace levels of harmful gases because of their high sensitivity and anti-electromagnetic interference. However, OWG-based SO2 and H2S-detecting sensors in the parts-per-trillion (ppt) range are still lacking. We fabricated 5,10,15,20-(tetra-4-aminophenyl) porphyrin (TAPP) thin film-based OWG sensor devices (TAPP-OWG) to detect SO2 and H2S gases, in which TAPP thin film was immobilized over the surface of a potassium ion exchange glass OWG. These sensors successfully measure extremely low concentrations of SO2 and H2S (detection limit = 1 ppt), providing good repeatability for SO2 (10 ppt) and H2S (10 ppt) gases, with relative standard deviations of 1.67% and 3.68%, respectively. With fast response (t1) and recovery (t2) times for SO2 (t1=4 s, t2=157 s) and H2S (t1=2 s, t2=117 s) at room temperature, TAPP thin film enhances the potential of OWGs for use in high-sensitivity trace-level gas detection.

中文翻译：

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使用四氨基苯基卟啉在万亿分之一范围内检测 SO2 和 H2S 的高灵敏度光波导传感器

摘要 光波导 (OWG) 传感器因其高灵敏度和抗电磁干扰而在检测痕量有害气体方面具有巨大潜力。然而，仍然缺乏万亿分率 (ppt) 范围内基于 OWG 的 SO2 和 H2S 检测传感器。我们制造了基于 5,10,15,20-(四-4-氨基苯基)卟啉 (TAPP) 薄膜的 OWG 传感器器件 (TAPP-OWG) 来检测 SO2 和 H2S 气体，其中 TAPP 薄膜固定在表面上钾离子交换玻璃 OWG。这些传感器成功地测量了极低浓度的 SO2 和 H2S（检测限 = 1 ppt），为 SO2 (10 ppt) 和 H2S (10 ppt) 气体提供了良好的重复性，相对标准偏差分别为 1.67% 和 3.68%。SO2 (t1=4 s, t2=157 s) 和 H2S (t1=2 s,