Disposable Multi-Walled Carbon Nanotubes-Based Plasticizer-Free Solid-Contact Pb 2+ -Selective Electrodes with a Sub-PPB Detection Limit <xref rid="fn1-sensors-509194" ref-type="fn">†</xref>

Potentiometric plasticizer-free solid-contact Pb²⁺-selective electrodes based on copolymer methyl methacrylate-<i>n</i>-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^&#8722;10 mol&#183;L^&#8722;1. The proposed electrodes demonstrated a Nernstian slope of 29.1 &#177; 0.5 mV/decade in the linear range from 2.0 &#215; 10^&#8722;10 to 1.5 &#215; 10^&#8722;3 mol&#183;L^&#8722;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.

Abstract licence: CC BY

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