Photonic microresonator based sensor for selective nitrate ion detection
Photonic microresonator based sensor for selective nitrate ion detection
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DOI：
10.1016/j.snb.2020.129027
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发表时间：
2021-02
影响因子：
8.4
通讯作者：
Zhongbo Zhang;Xufeng Zhang;T. Rajh;S. Guha
中科院分区：
文献类型：
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作者：
Zhongbo Zhang;Xufeng Zhang;T. Rajh;S. Guha
使用可现场部署的紧凑型传感器平台以高灵敏度和选择性感测土壤中的硝酸盐浓度是环境和农业应用的一个受欢迎的目标。本研究展示了一种新的基于离子选择性膜（ISM）功能化芯片级光子微环谐振器的硝酸盐传感平台。我们的方法依赖于测量微谐振器中的谐振位移，并利用了ISM的优良光学特性，尽管研究很少。使用高质量的微环谐振器，硝酸盐离子选择性光子传感器的检测限低至百万分之0.1（ppm），并能够在1 - 100 ppm水平上测量硝酸盐浓度，适用于土壤科学和农业。重要的是，该传感器对土壤中的其他竞争阴离子（如Cl−和NO2−）也表现出高选择性。我们认为，这种芯片级的方法可以被纳入紧凑的传感器平台。
Sensing nitrate concentrations in soil with high sensitivity and selectivity using field-deployable compact sensor platforms is a sought-after goal for environment and agriculture applications. This study demonstrates a new optically based nitrate sensing platform based on ion-selective membrane (ISM) functionalized chip-scale photonic micro-ring resonators. Our approach relies upon measurements of resonance shifts in the micro-resonators and leverages the excellent, though little studied, optical properties of ISMs. Using a high-quality micro-ring resonator, a nitrate ion-selective photonic sensor exhibits a detection limit down to 0.1 parts per million (ppm) and enables nitrate concentration measurements in the 1−100 ppm level, appropriate for soil science and agriculture. Importantly, the sensor also shows high selectivity over other competing anions in soil, such as Cl−and NO2−. We argue that this chip-scale approach can be incorporated into compact sensor platforms.