title: Decoration of multi-walled carbon nanotubes with metal nanoparticles in supercritical carbon dioxide medium as a novel approach for the modification of screen-printed electrodes.
abstract: 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 2.6×10-6and 2×10-4molL-1and a limit of detection of 0.8×10-6molL-1were obtained. These parameters represented a minimum 3-fold increase in sensitivity compared to the use of bare MWCNTs or other carbon-based working electrodes.
authors: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Ciudad Real 13071, Spain; Regional Institute for Applied Chemistry Research (IRICA), Ciudad Real 13071, Spain.
authors: Virginia
authors: V
authors: Moreno
authors: Regional Institute for Applied Chemistry Research (IRICA), Ciudad Real 13071, Spain.
authors: Eulogio J
authors: EJ
authors: Llorent-Martínez
authors: Regional Institute for Applied Chemistry Research (IRICA), Ciudad Real 13071, Spain; Castilla-La Mancha Science and Technology Park, Albacete 02001, Spain.
authors: Mohammed
authors: M
authors: Zougagh
authors: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Ciudad Real 13071, Spain; Regional Institute for Applied Chemistry Research (IRICA), Ciudad Real 13071, Spain. Electronic address: Angel.Rios@uclm.es.
authors: Angel
authors: A
authors: Ríos
keywords: Analytical applications; Carbon nanotubes decoration; Metal nanoparticles; Screen-printed electrodes; Supercritical carbon dioxide