Disposable pH Sensor on Paper Using Screen-Printed Graphene-Carbon Ink Modified Zinc Oxide Nanoparticles
Disposable pH Sensor on Paper Using Screen-Printed Graphene-Carbon Ink Modified Zinc Oxide Nanoparticles
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DOI：
10.1109/jsen.2022.3206212
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发表时间：
2022-11-01
影响因子：
4.3
通讯作者：
Dahiya, Ravinder
中科院分区：
文献类型：
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作者：
Aliyana, Akshaya Kumar;Ganguly, Priyanka;Dahiya, Ravinder
pH 值的估算对于评估从水到土壤、健康和环境监测等各种应用中的生化和生物过程至关重要。这项工作报告了一种使用阻抗法的丝网印刷柔性一次性 pH 传感器。该pH传感器是通过在纸基板上丝网印刷石墨烯碳（G-C）改性氧化锌（ZnO）基活性层而制成的，在pH 2-9范围内显示出近三个数量级的阻抗变化。该传感器使用 COMSOL Multiphysics 软件精心设计，以了解电极几何形状和整个结构中产生的电势的影响。开发的传感器用于土壤pH监测，表现出5.27 k Omega/pH 2-8的高灵敏度，相关系数（R-2）为0.99。最后，实施了支持物联网的智能 pH 检测系统，用于连续 pH 监测，以实现数字农业中的潜在应用。结果表明，所提出的灵活的一次性 pH 传感器甚至可以使用少量样品来监测水、产品过程、人类健康和化学（或生物）反应。
The estimation of pH is vital to assess the biochemical and biological processes in a wide variety of applications ranging from water to soil, health, and environment monitoring. This work reports a screen-printed flexible and disposable pH sensor using the impedimetric method. The pH sensor was fabricated by screen printing graphenecarbon (G-C) modified zinc oxide (ZnO)-based active layer on a paper substrate and shows nearly three orders of change in impedancemagnitude in the pH range of 2-9. The sensor was carefully designed using COMSOL Multiphysics software to understand the influence of electrode geometry and the electrical potential developed across the structure. The developed sensor was used for pH monitoring of soil and exhibited high sensitivity of 5.27 k Omega/pH 2-8 with a correlation coefficient ( R-2) of 0.99. Finally, an IoT-enabled smart pH detection system was implemented for continuous pHmonitoring for potential application in digital agriculture. The outcome demonstrates that the presented flexible and disposable pH sensor could open new opportunities for monitoring of water, product process, human health, and chemical (or bio) reactions even by using small volumes of samples.