Hydrophobic laser-induced graphene potentiometric ion-selective electrodes for nitrate sensing
Hydrophobic laser-induced graphene potentiometric ion-selective electrodes for nitrate sensing
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DOI：
10.1007/s00604-022-05233-5
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发表时间：
2022-02
影响因子：
5.7
通讯作者：
Robert G. Hjort;Raquel R. A. Soares;Jingzhe Li;Dapeng Jing;Lindsey M. Hartfiel;Bolin Chen;B. Van Belle;M. Soupir;Emily A. Smith;E. McLamore;J. Claussen;C. Gomes
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作者：
Robert G. Hjort;Raquel R. A. Soares;Jingzhe Li;Dapeng Jing;Lindsey M. Hartfiel;Bolin Chen;B. Van Belle;M. Soupir;Emily A. Smith;E. McLamore;J. Claussen;C. Gomes
目前的固体接触离子选择性电极（ISE）遭受信噪比漂移和短寿命，部分原因是水分吸收和换能器和离子选择性膜之间的水层的发展。为了解决这些挑战，我们报告的硝酸盐伊势的基础上的疏水激光诱导石墨烯（LIG）涂有聚（乙烯）氯为基础的硝酸盐选择性膜。在环境条件（空气，23.0 ± 1.0 °C）下使用聚酰亚胺基底和双激光工艺产生疏水LIG，其在润湿性测试中产生135.5 ± 0.7°（平均值±标准偏差）的静态水接触角。LIG-ISE的能斯特响应为− 58.17 ± 4.21 mV dec− 1，检测限（LOD）为6.01 ± 1.44 µM。恒电流计时电位法和水层测试被用来评估潜在的（电动势）信号的稳定性与以前发表的工作与石墨烯为基础的离子选择电极的性能相似。使用便携式恒电位仪，当分析从爱荷华州艾姆斯的两个湖泊采集的水样时，传感器显示出与美国环境保护署（EPA）认可的分析方法相当（p> 0.05）的结果。将传感器在地表水样品中储存5周，显示性能（LOD和灵敏度）无显著差异。这些结果，结合快速和低成本的制造技术，使疏水LIG-ISE的开发吸引了广泛的长期原位地表水质量应用。图形摘要
Current solid-contact ion-selective electrodes (ISEs) suffer from signal-to-noise drift and short lifespans partly due to water uptake and the development of an aqueous layer between the transducer and ion-selective membrane. To address these challenges, we report on a nitrate ISE based on hydrophobic laser-induced graphene (LIG) coated with a poly(vinyl) chloride–based nitrate selective membrane. The hydrophobic LIG was created using a polyimide substrate and a double lasing process under ambient conditions (air at 23.0 ± 1.0 °C) that resulted in a static water contact angle of 135.5 ± 0.7° (mean ± standard deviation) in wettability testing. The LIG–ISE displayed a Nernstian response of − 58.17 ± 4.21 mV dec−1and a limit-of-detection (LOD) of 6.01 ± 1.44 µM. Constant current chronopotentiometry and a water layer test were used to evaluate the potential (emf) signal stability with similar performance to previously published work with graphene-based ISEs. Using a portable potentiostat, the sensor displayed comparable (p> 0.05) results to a US Environmental Protection Agency (EPA)–accepted analytical method when analyzing water samples collected from two lakes in Ames, IA. The sensors were stored in surface water samples for 5 weeks and displayed nonsignificant difference in performance (LOD and sensitivity). These results, combined with a rapid and low-cost fabrication technique, make the development of hydrophobic LIG–ISEs appealing for a wide range of long-term in situ surface water quality applications.Graphical abstract