Disposable Screen-printed Bismuth Electrode Modified with Multi-walled Carbon Nanotubes for Electrochemical Stripping Measurements

作者：Niu, Xiangheng; Zhao, Hongli; Lan, Minbo^*

来源：Analytical Sciences, 2011, 27(12): 1237-1241.

DOI：10.2116/analsci.27.1237

• TRACE-METALS
• VOLTAMMETRIC MEASUREMENTS
• FILM ELECTRODES
• MERCURY
• FABRICATION
• COMPOSITES
• PARAMETERS
• OXIDASE
• SENSOR

Integrating the advantages of screen printing technology with the encouraging electroanalytical characteristic of metallic bismuth, we developed an ultrasensitive and disposable screen-printed bismuth electrode (SPBE) modified with multi-walled carbon nanotubes (MWCNTs) for electrochemical stripping measurements. Metallic bismuth powders and MWCNTs were homogeneously mixed with graphite-carbon ink to mass-prepare screen-printed bismuth electrode doped with multi-walled carbon nanotubes (SPBE/MWCNT). The electroanalytical performance of the prepared SPBE/MWCNT was intensively evaluated by measuring trace Hg(II) with square-wave anodic stripping voltammetry (SWASV). The results indicated that the SPBE modified with 2 wt% MWCNTs could offer a more sensitive response to trace Hg(II) than the bare SPBE. The stripping current obtained at SPBE/MWCNT was linear with Hg(II) concentration in the range from 0.2 to 40 mu g/L (R-2 = 0.9976), with a detection limit of 0.09 mu g/L (S/N = 3) under 180 s accumulation. The proposed "mercury-free" electrode, with extremely simple preparation and ultrahigh sensitivity, holds wide application prospects in both environmental and industrial monitoring.

• 出版日期2011-12
• 单位华东理工大学