Disposable Planar Reference Electrode Based on Carbon Nanotubes and Polyacrylate Membrane

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• 作者：F. Xavier Rius-Ruiz ; Diego Bejarano-Nosas ; Pascal Blondeau ; Jordi Riu ; F. Xavier Rius
• 刊名：Analytical Chemistry
• 出版年：2011
• 出版时间：July 15, 2011
• 年：2011
• 卷：83
• 期：14
• 页码：5783-5788
• 全文大小：807K
• 年卷期：v.83,no.14(July 15, 2011)
• ISSN：1520-6882

文摘

In this technical note, we report a new all-solid-state planar reference electrode based on single-walled carbon nanotubes and photocured poly(n-butylacrylate) (poly(nBA)) membrane containing the Ag/AgCl/Cl^{鈥?/sup> ion system. Single-walled carbon nanotubes functionalized with octadecylamide (SWCNT-ODA) and deposited by drop-casting onto a disposable screen-printed electrode are an excellent all-solid-state transducer. The novel potentiometric planar reference electrode shows low potential variability (calibration slopes inferior to 2 mV/dec) for a wide range of chemical species (i.e., ions, small molecules, proteins) in a wide calibration range, redox pairs, changes in pH, and changes in ambient light. Potentiometric medium-term signal stability (鈭?.9 卤 0.2 mV/h) and electrochemical impedance characterization confirm the correct solid contact between the SWCNT-ODA layer and photocured poly(nBA) membrane. Overall, the materials used and the simple fabrication by screen-printing and drop-casting enable a high throughput and highly parallel and cost-effective mass manufacture of the new disposable reference electrode. Moreover, the reference electrode has a long shelf life, a characteristic that can be of special interest in decentralized and multiplexing potentiometric analysis.}