Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing,Electroanalysis

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Low Cost Layer by Layer Construction of CNT/Chitosan Flexible Paper‐based Electrodes: A Versatile Electrochemical Platform for Point of Care and Point of Need Testing
Electroanalysis ( IF 2.7 ) Pub Date : 2018-01-12 , DOI: 10.1002/elan.201700782
Federico Figueredo ₁ , María Jesús González-Pabón ₁ , Eduardo Cortón ₁

Affiliation

Modification of cellulosic paper with carbon nanotubes (CNT) was studied for the development of electronic and analytical devices. Interesting results were published by using a CNT aqueous solution and the capillary forces of filter paper to make conductive tracks, supercapacitors, potentiometric electrodes and chemometric sensors. In this report, we show for the first time an electrochemical characterization of CNT‐CS‐SDS paper electrodes constructed with an ink containing optimized proportions of multi‐wall CNT, chitosan (CS) and sodium dodecyl sulfate (SDS), and we compared our data with CNT‐SDS paper electrodes constructed with a previously reported ink. We achieved better reversibility (ΔE=131±14 mV, CVs) and reproducibility (RSD=3.63 %) with CNT‐CS‐SDS paper electrodes, when compared to CNT‐SDS paper electrodes (ΔE=249±7 mV; RSD=6.8 %) used as controls. When electrodes were fold at 90° angle, CNT‐CS‐SDS paper electrodes showed lower RSD than CNT‐SDS paper electrodes, 8.43 % and 21.5 % respectively. These results are in concordance with SEM analysis indicating a dense CS film in CNT‐CS‐SDS paper electrodes. As a proof of concept, we determine dopamine concentration by DPV in the presence of ascorbic and uric acids, the limit of detection calculated was 6.32 μM. Moreover, a bismuth‐film was prepared by in situ plating of Bi into CNT‐CS‐SDS paper electrodes. ASV allowed us to detect Pb in the presence of Bi (10–200 ppb) with a limit of detection of 6.74 ppb.

中文翻译：

CNT /壳聚糖柔性纸基电极的低成本逐层构造：用于护理点和需求点测试的多功能电化学平台

研究了碳纳米管（CNT）对纤维素纸的改性，以开发电子和分析设备。通过使用CNT水溶液和滤纸的毛细管力制作导电迹线，超级电容器，电位电极和化学计量传感器，发表了有趣的结果。在本报告中，我们首次展示了使用包含优化比例的多壁CNT，壳聚糖（CS）和十二烷基硫酸钠（SDS）的墨水构造的CNT-CS-SDS纸电极的电化学特性，并且我们比较了我们的使用先前报告的墨水构造的CNT‐SDS纸电极获得数据。与CNT‐SDSS纸电极相比（ΔE= 249±7 mV; RSD = 6），我们使用CNT‐CS‐SDS纸电极实现了更好的可逆性（ΔE= 131±14 mV，CVs）和可重复性（RSD = 3.63％）。8％）用作对照。当电极以90°角折叠时，CNT‐CS‐SDS纸电极的RSD低于CNT‐SDS纸电极的RSD，分别为8.43％和21.5％。这些结果与SEM分析一致，表明CNT-CS-SDS纸电极中有致密的CS膜。作为概念的证明，我们在抗坏血酸和尿酸存在的情况下通过DPV测定多巴胺浓度，计算出的检出限为6.32μM。此外，通过以下步骤制备了铋膜：计算的检出限为6.32μM。此外，通过以下步骤制备了铋膜：计算的检出限为6.32μM。此外，通过以下步骤制备了铋膜：将Bi原位电镀到CNT-CS-SDS纸电极中。ASV使我们能够在Bi（10–200 ppb）存在的情况下检测Pb，检测限为6.74 ppb。

更新日期：2018-01-12

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