Synthesis of pure ZnO and bismuth‐doped ZnO (xBi/Zn) (x = 6 wt%) thin‐film based optical fiber sensor and their material/optical characterization such as Brunauer–Emmett–Teller (BET) analysis, field‐emission scanning electron microscopy (FESEM), and energy dispersive X‐ray (EDX) analysis is reported. As‐prepared material such as xBi/Zn is deposited over the optical fiber, and optimum clad thickness in the range of 2–5 μm is achieved through MATLAB simulation to enhance the feasible evanescent field interaction with gas analyte molecules. The modal field analysis of the sensing probe before and after the deposition of xBi/Zn is also studied using COMSOL Multiphysics Modeling software and find strong light propagation into the LP₀₄ mode. The sensing probes are tested in different chemicals and ethylenediamine (EDA) is found to be the most suitable candidate in the concentration range of 100–800 ppm. The response time of the ZnO and xBi/Zn‐doped thin‐film‐based optical sensor is found to be 20 and 15 s, whereas the corresponding sensitivity (%) is 1.078 and 3.483, respectively. The repeatability test of the sensor is also carried out which reveals good response stability.

中文翻译：

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基于E逝场技术的光纤双掺杂ZnO薄膜的制备及其在水介质中乙二胺检测中的应用

纯ZnO和铋掺杂的ZnO（x Bi / Zn）（x  = 6 wt％）薄膜光纤传感器的合成及其材料/光学特性，例如Br​​unauer-Emmett-Teller（BET）分析，场发射扫描电子显微镜（FESEM）和能量色散X射线（EDX）分析的报道。准备好的材料（例如x Bi / Zn）沉积在光纤上，通过MATLAB仿真可增强2–5μm的最佳包层厚度，以增强与气体分析物分子之间可行的feasible逝场相互作用。还使用COMSOL Multiphysics Modeling软件研究了x Bi / Zn沉积前后感测探针的模态场分析，发现强光传播到LP中₀₄模式。感测探针已在不同的化学品中测试，发现乙二胺（EDA）在100-800 ppm的浓度范围内是最合适的候选物。ZnO和x Bi / Zn掺杂的薄膜光学传感器的响应时间分别为20和15 s，而相应的灵敏度（％）分别为1.078和3.483。还进行了传感器的重复性测试，显示了良好的响应稳定性。