基于四苯基卟啉铁敏感膜的玻璃光波导传感器对乙二胺的响应特性

为检测食品变质过程中产生的乙二胺气体,采用Alder法合成了四苯基卟啉和四苯基卟啉铁化合物,通过核磁(~1H NMR)、场发射扫描电子显微镜(FE-SEM)、红外光谱(IR)、紫外可见光谱(UV-Vis)等手段对其进行表征,并以四苯基卟啉铁作为敏感试剂,利用旋涂法制备了四苯基卟啉铁薄膜/K+交换玻璃光波导传感元件,对多种气体进行检测。结果表明:该传感元件对乙二胺气体具有较好的选择性响应,较高的灵敏度,在1×10~(-10)~1×10~(-4)(V/V_0;V:被检测气体体积,V0:空气体积)体积比范围内,体积比与输出光强度间线性关系良好(R=0.9940),响应时间和恢复时间分别为3 s和11 s,信噪比S/N=4.8,RSD=0.5%(V/V_0=1×10~(-7))。平行试验中,其结果也具有良好的线性关系(R=0.9985),证明该传感元件对乙二胺气体检测的准确性。该类传感元件在食品品质检测方面有很好的应用与发展。

Gas-sensing Properties to Ethylenediamine Based on Tetraphenylporphyrin Iron Sensitive Film Optical Waveguide Sensor

To detect ethylenediamine gas produced by the degradation of flavor during food deterioration process, tetraphenylporphyrin iron was synthesized via Alder method and its thin film/K⁺ exchanged glass waveguide sensor were prepared by spin coating. This sensor exhibits selective and high sensitive response to ethylenediamine. In the volume ratio range of 1×10^-10~1×10^-4(V/V₀), there is a good linear relationship between the volume ratio and output light intensity(R=0.9940). The response time and recovery time are 3 s and 11 s, respectively. The signal to noise ratio(S/N) is 4.8, RSD=0.5%(V/V₀=1×10^-7). Good linear relationship between the volume ratio and output light intensity(R=0.9985) in parallel experiments also proves the accuracy of this sensor toward ethylenediamine gas detection. This sensor has potential application in the field of food quality examination.