This work reports on the development of an impedance sensor-based real-time-field specific system to monitor aqueous Ammonium (NH4+). The sensing element was fabricated by modifying screen-printed interdigitated electrodes (IDEs) with a hybrid nanocomposite of Multi-Wall Carbon Nanotube (MWCNT) with Zinc Oxide (ZnO) nanocrystals. The NH4+ of the water was monitored, and it exhibited a sensitivity of 67.13Ω67.13 \,\,\Omega /mM with average correlation coefficients of 0.80. The impedance magnitude ( Ω\Omega ) of the NH4+ sensor was unaffected by the presence of Fe2+, Ni2+, K+ and P+ interfering cations. The developed sensor was interfaced with an IoT-enabled NodeMCU microcontroller, enabling a direct method for continuous monitoring of NH4+ concentrations. This integrated system is interconnected to the field-deployed sensor nodes, which provide real-time NH4+ levels to the remote user through web applications.

中文翻译：

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基于MWCNT/ZnO纳米复合材料的实时氨检测阻抗传感器


这项工作报告了基于阻抗传感器的实时现场特定系统的开发，用于监测氨水 (NH4+)。该传感元件是通过使用多壁碳纳米管 (MWCNT) 与氧化锌 (ZnO) 纳米晶体的混合纳米复合材料修改丝网印刷叉指电极 (IDE) 来制造的。监测水中NH4+，灵敏度为67.13Ω67.13Ω/mM，平均相关系数为0.80。 NH4+ 传感器的阻抗大小 ( Ω\Omega ) 不受 Fe2+、Ni2+、K+ 和 P+ 干扰阳离子存在的影响。开发的传感器与支持物联网的 NodeMCU 微控制器连接，实现了连续监测 NH4+ 浓度的直接方法。该集成系统与现场部署的传感器节点互连，后者通过 Web 应用程序向远程用户提供实时 NH4+ 水平。