Potentiometric Strip Cell Based on Carbon Nanotubes as Transducer Layer: Toward Low-Cost Decentralized Measurements

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• 作者：F. Xavier Rius-Ruiz ; Gast贸n A. Crespo ; Diego Bejarano-Nosas ; Pascal Blondeau ; Jordi Riu ; F. Xavier Rius
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：November 15, 2011
• 年：2011
• 卷：83
• 期：22
• 页码：8810-8815
• 全文大小：836K
• 年卷期：v.83,no.22(November 15, 2011)
• ISSN：1520-6882

文摘

In this study, we developed a potentiometric planar strip cell based on single-walled carbon nanotubes that aims to exploit the attributes of solid-contact ion-selective electrodes for decentralized measurements. That is, the ion-selective and reference electrodes have been simultaneously miniaturized onto a plastic planar substrate by screen-printing and drop-casting techniques, obtaining disposable strip cells with satisfactory performance characteristics (i.e., the sensitivity is 57.4 卤 1.3 mV/dec, the response time is 鈮?0 s within the linear range from log a_K+ = 鈭? to 鈭?, and the limit of detection is 鈭?.5), no need of maintenance during long dry storage, quick signal stabilization, and light insensitivity in short-term measurements. We also show how the new potentiometric strip cell makes it possible to perform decentralized and rapid determinations of ions in real samples, such as saliva or beverages.