Flexible copper-biopolymer nanocomposite sensors for trace level lead detection in water
Flexible copper-biopolymer nanocomposite sensors for trace level lead detection in water
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DOI：
10.1016/j.snb.2021.130263
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发表时间：
2021-06-23
影响因子：
8.4
通讯作者：
Cho, Hyoung J.
中科院分区：
文献类型：
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作者：
Pathak, Pawan;Hwang, Jae-Hoon;Cho, Hyoung J.
在这项工作中，一种新型的铜-壳聚糖（Cu-chitosan）纳米复合材料为基础的柔性电化学传感器与集成的Ag/AgCl参比电极的制作。该电化学传感器采用低成本的丝网印刷技术在柔性基底上制造，然后通过电解氯化银以形成集成的Ag/AgCl参比电极和电化学沉积Cu-壳聚糖纳米复合膜以产生工作电极。使用XPS（X射线光电子能谱）对工作电极和参比电极的表面化学分析显示功能层的形成。所制造的基于Cu-壳聚糖纳米复合物的传感器用于测定真实世界水样中的痕量水平铅（Pb 2+）离子（即，自来水、采矿废水和土壤渗滤液）使用方波阳极溶出伏安法（SWSAV）。在与集成Ag/AgCl参比电极相比类似的0.46 V处观察到铅离子的显著峰。该传感器在自来水中的检出限为0.72 ppb，相对标准偏差（n = 10）为0.65%。制作的电化学传感器表现出更高的响应铅离子（Pb 2+）比以前报道的铜基电化学传感器。这些结果表明，壳聚糖在复合材料上的存在增强了灵敏度和机械柔性。
In this work, a novel copper-chitosan (Cu-chitosan) nanocomposite-based flexible electrochemical sensor with an integrated Ag/AgCl reference electrode is fabricated. The electrochemical sensor is fabricated using low-cost screen-printing technology on a flexible substrate, followed by the electrochlorination of silver to form an integrated Ag/AgCl reference electrode and electrochemical deposition of a Cu-chitosan nanocomposite film to produce a working electrode. The surface chemical analysis of the working and reference electrodes using XPS (X-ray photoelectron spectroscopy) shows the formation of functional layers. The fabricated Cu-chitosan nanocomposite-based sensors are used to determine the trace level lead (Pb2+) ions in real-world water samples (i.e., tap water, mining wastewater, and soil leachate) using square wave anodic stripping voltammetry (SWSAV). A noticeable peak for lead ions is observed at similar to 0.46 V vs. integrated Ag/AgCl reference electrode. The limit of detection (LOD) of the developed flexible electrochemical sensor in tap water is 0.72 ppb with the relative standard deviations (n = 10) of 0.65 %. The fabricated electrochemical sensor exhibits a higher response to lead ions (Pb2+) than the previously reported copper-based electrochemical sensor. These results show that chitosan's presence on the composite material enhances the sensitivity and mechanical flexibility.