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Disposable Multi-Walled Carbon Nanotubes-Based Plasticizer-Free Solid-Contact Pb2+-Selective Electrodes with a Sub-PPB Detection Limit

机译:一次性多壁碳纳米管为基础的无增塑剂的固态接触式Pb2 +选择性电极具有低于PPB的检测极限

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摘要

Potentiometric plasticizer-free solid-contact Pb2+-selective electrodes based on copolymer methyl methacrylate-n-butyl acrylate (MMA-BA) as membrane matrix and multi-walled carbon nanotubes (MWCNTs) as intermediate ion-to-electron transducing layer have been developed. The disposable electrodes were prepared by drop-casting the copolymer membrane onto a layer of MWCNTs, which deposited on golden disk electrodes. The obtained electrodes exhibited a sub-ppb level detection limit of 10−10 mol·L−1. The proposed electrodes demonstrated a Nernstian slope of 29.1 ± 0.5 mV/decade in the linear range from 2.0 × 10−10 to 1.5 × 10−3 mol·L−1. No interference from gases (O2 and CO2) or water films was observed. The electrochemical impedance spectroscopy of the fabricated electrodes was compared to that of plasticizer-free Pb2+-selective electrodes without MWCNTs as intermediated layers. The plasticizer-free MWCNTs-based Pb2+-selective electrodes can provide a promising platform for Pb(II) detection in environmental and clinical application.
机译:基于甲基丙烯酸甲酯-丙烯酸正丁酯(MMA-BA)共聚物作为膜基质和多壁碳纳米管(MWCNTs)作为中间离子的无电位增塑剂固相Pb 2 + 选择电极电子到电子的换能层已经被开发出来。通过将共聚物膜滴铸到沉积在金黄色圆盘电极上的MWCNT层上来制备一次性电极。所得电极的亚ppb水平检测限为10 -10 mol·L -1 。所建议的电极在2.0×10 -10 到1.5×10 -3 mol·L的线性范围内表现出29.1±0.5 mV /十倍的Nernstian斜率。 -1 。没有观察到来自气体(O2和CO2)或水膜的干扰。将制成的电极的电化学阻抗谱与不含MWCNTs作为中间层的无增塑剂的Pb 2 + 选择性电极进行了比较。不含增塑剂的基于MWCNTs的Pb 2 + 选择性电极可为环境和临床应用中的Pb(II)检测提供有希望的平台。

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