期刊
ACS OMEGA
卷 5, 期 30, 页码 18987-18994出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02279
关键词
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资金
- RSF [19-73-00315]
- ITMO Fellowship
- Russian Science Foundation [19-73-00315] Funding Source: Russian Science Foundation
In this paper, we describe an electrochemical sensing platform-ElectroSens-for the detection of Zn based on self-assembled polyelectrolyte multilayers on the carbon fiber (CF) electrode surface. The CF-extended surface facilitates the usage of a small volume electrochemical cell (1 mL) without stirring. This approach allows making a low-cost three-electrode platform. Working electrode modification with layer-by-layer assembly of polyethyleneimine (PEI), poly(sodium 4-styrenesulfonate) (PSS), and mercury nitrate layers eliminates solution toxicity and provides stable stripping voltammetry measurements. The stable, robust, sustainable, and even reusable Ag/AgCI reference electrode consists of adsorbed 32 PEI-KCl/PSS-KCl bilayers on the CF/silver paste separated from the outer solution by a polyvinyl chloride membrane. The polyelectrolyte-based sensor interface prevents adsorption of protein molecules from biological liquids on the CF surface that leads to a sensitivity increase of up to 2.2 mu A/M for Zn2+ detection and provides a low limit of detection of 4.6 x 10(-8 )M. The linear range for Zn detection is 1 x 10(-7) to 1 x 10(-5) M. A portable potentiostat connected via wireless to a smartphone with an android-based software is also provided. The ElectroSens demonstrates reproducibility and repeatability of data for the detection of Zn in blood and urine without the digestion step.
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