Microplotter-Printed Graphene-Based Electrochemical Sensor for Detecting Phosphates
Microplotter-Printed Graphene-Based Electrochemical Sensor for Detecting Phosphates
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DOI：
10.1021/acsanm.3c04228
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发表时间：
2023-10
影响因子：
5.9
通讯作者：
T. Nagaraja;Rajavel Krishnamoorthy;Kh M Asif Raihan;Brice Lacroix;Suprem R. Das
中科院分区：
文献类型：
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作者：
T. Nagaraja;Rajavel Krishnamoorthy;Kh M Asif Raihan;Brice Lacroix;Suprem R. Das
对纳米级材料界面及其直接环境中离子电化学传输的基本了解，为构建解决各种化学、生物和环境问题的电化学传感器奠定了基础。因此，实现从环境到原子薄的二维材料（例如石墨烯）的有效电子转移，反之亦然，为构建基于石墨烯的电化学传感器提供了一条途径。尽管近年来报道了许多基于石墨烯的电化学传感器，但在设计和制造它们来监测环境中的磷酸盐离子方面仍存在局限性。这种限制主要是由于缺乏高性能可印刷石墨烯纳米油墨（就其综合导电性和电化学电荷转移特性而言）以及磷酸根离子检测的复杂性。在此，我们报告了高质量石墨烯纳米墨水的制造及其首次用于使用显微绘图仪制造稳定可靠的印刷磷酸盐离子电化学传感器。这些传感器的灵敏度为 0.3223 ± 0.025 μA μM–1cm–2，检测限 (LOD) 为 2.2 μM，线性传感范围为 1–600 μM。此外，在存在 NO3、CO3、Cl 和 SO42 干扰离子的情况下进行测试时，它们对磷酸盐表现出高选择性，证实了它们作为传感平台的可靠性。使用所提出的印刷石墨烯传感器进行磷酸盐电化学传感将为环境传感中即时护理和连续磷酸盐监测的未来发展铺平道路。
The fundamental understanding of the electrochemical transport of ions at the interface of nanoscale materials and its immediate environment lays the foundation to build electrochemical sensors for a wide variety of chemical, biological, and environmental problems. Therefore, enabling an efficient electron transfer from the environment to an atomically thin, two-dimensional material such as graphene and vice versa provides a route to building graphene-based electrochemical sensors. Although many graphene-based electrochemical sensors have been reported in recent years, there have been limitations in designing and manufacturing them to monitor phosphate ions in the environment. This limitation primarily arises from the lack of high-performance printable graphene nanoinks (in terms of their combined electrical conductivity and electrochemical charge transfer properties) as well as complexity in the detection of phosphate ions. Herein, we report the manufacturing of a high-quality graphene nanoink and its use for the first time in fabricating stable and reliable printed phosphate ion electrochemical sensors using a microplotter. These sensors demonstrate a sensitivity of 0.3223 ± 0.025 μA μM–1cm–2, with a limit of detection (LOD) of 2.2 μM and linear sensing range of 1–600 μM. Moreover, they exhibit high selectivity toward phosphates when tested in the presence of NO3–, CO3–, Cl–, and SO42–interfering ions, affirming their reliability as a sensing platform. Phosphate electrochemical sensing using the proposed printed graphene sensors will pave the way for future development of point-of-care and continuous phosphate monitoring in environmental sensing.