Optical waveguide (OWG) sensors are widely used in gas detection, and sensitive materials are the key factors affecting sensor performance. Herein, we report on a 5,10,15,20-tetrakis-(4-methoxyphenyl) porphyrin (TMP) deposited optical wave guide (OWG) sensor. The porphyrin solutions with different acidity were deposited on a K⁺-ion exchanged glass OWG surface by spin coating, to fabricate porphyrin film-coated OWG gas sensing devices. The effects of pH values of the porphyrin solution used to prepare the sensitive film on the sensing properties of these devices were investigated. The gas sensitive performances of these devices in response to analytes were compared. Among them, the sensing devices fabricated using original and acidic solutions of porphyrin exhibited significant responses to sulfide gases and ethanediamine, respectively. The sensing device prepared using an acidic solution has a good response to ethanediamine gas (response and recovery times of the sensor for 1 ppm of EDA (ΔI = 48) are 13 and 38 s, respectively). The RSD of the output light intensity is ±2.84, the signal to noise ratio (S/N) is 5.6. The device prepared using the original solution has an excellent response to sulfide gases (H₂S, SO₂), and can detect low concentration levels (ppm) of sulfide gases. These sensing devices thus have the potential to be used in food quality testing and environmental monitoring.

光波导（OWG）传感器广泛用于气体检测，敏感材料是影响传感器性能的关键因素。在本文中，我们报道了5,10,15,20-四-（4-甲氧基苯基）卟啉（TMP）沉积的光波导（OWG）传感器。将不同酸度的卟啉溶液沉积在K ^+上通过旋涂离子交换玻璃OWG的表面，以制造卟啉薄膜涂层的OWG气体传感装置。研究了用于制备敏感膜的卟啉溶液的pH值对这些设备的传感性能的影响。比较了这些设备对分析物的气体敏感性能。其中，使用卟啉的原始溶液和酸性溶液制造的传感设备分别对硫化物气体和乙二胺表现出显着的响应。使用酸性溶液制备的传感设备对乙二胺气体具有良好的响应（EDA为1 ppm（ΔI= 48）时传感器的响应和恢复时间分别为13 s和38 s）。输出光强度的RSD为±2.84，信噪比（S / N）为5.6。₂ S，SO ₂），并且可以检测出低浓度水平（ppm）的硫化物气体。因此，这些传感设备具有用于食品质量测试和环境监测的潜力。