期刊
MICROCHIMICA ACTA
卷 189, 期 3, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-022-05233-5
关键词
Ion-selective electrodes (ISE); Solid contact; PVC membrane; Graphene; Potentiometry; Water quality; Agricultural nutrients
资金
- National Institute of Food and Agriculture
- U.S. Department of Agriculture [2019-05855, 2020-04109, 2018-672-6701627578]
- National Science Foundation [CBET-1706994, CBET-1756999, CBET1805512, ECCS-1841649, CMMI-2037026]
In this study, a hydrophobic laser-induced graphene-based nitrate ion-selective electrode is developed to address the current issues in solid-contact ion-selective electrodes. The electrode shows comparable performance to a US Environmental Protection Agency-accepted analytical method for water quality analysis.
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 degrees C) that resulted in a static water contact angle of 135.5 +/- 0.7 degrees (mean +/- standard deviation) in wettability testing. The LIG-ISE displayed a Nernstian response of - 58.17 +/- 4.21 mV dec(-1) and a limit-of-detection (LOD) of 6.01 +/- 1.44 mu M. 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据