Journal
TALANTA
Volume 161, Issue -, Pages 775-779Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2016.09.044
Keywords
Carbon nanotubes decoration; Metal nanoparticles; Supercritical carbon dioxide; Screen-printed electrodes; Analytical applications
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Funding
- Spanish Ministry of Economy and Competitiveness (MINECO) [CTQ2013-48411-P]
- JJCC Castilla-La Mancha [JCCM PEIC-2014-001-P]
- UCLM Research Plan
- INCRECYT
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A supercritical carbon dioxide medium was used for the decoration of functionalized multi-walled carbon nanotubes (MWCNTs) with metallic nanoparticles. This procedure allowed the rapid and simple decoration of carbon nanotubes with the selected metallic nanoparticles. The prepared nanomaterials were used to modify screen-printed electrodes, improving their electrochemical properties and allowing to obtain a wide range of working electrodes based on carbon nanotubes. These electrodes were applied to the amperometric determination of vitamin B6 in food and pharmaceutical samples as an example of the analytical potentiality of the electrodes thus prepared. Using Ru-nanoparticles-MWCNTs as the working electrode, a linear dynamic range between 2.6x 10(-6) and 2x10(-4) mol L-1 and a limit of detection of 0.8x10(-6) mol L-1 were obtained. These parameters represented a minimum 3-fold increase in sensitivity compared to the use of bare MWCNTs or other carbon-based working electrodes.
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