Pd Nanoparticles/Multiwalled Carbon Nanotubes Electrode System for Voltammetric Sensing of Tyrosine

Abstract

A facile and quick synthesis of palladium decorated multi-walled carbon nanotubes is presented in this work. The developed protocol allowed a quasi-homogeneous distribution of the metal nanoparticles on the surface of the nanotubes, and a controlled size of the nanoparticles in a range between 3.5 and 4.5 nm. After the characterization of the hybrid nanocomposite a first attempt on a possible application was made. The preliminary test, an ink-like nanocomposite as a modifier on the surface of a carbon screen-printed electrode, was performed in order to detect L-Tyrosine. Preliminary results are promising. A catalytic effect on the oxidation peak of the L-Tyrosine was shown and furthermore a low limit of detection, 1.46 x 10(-10) M, was reached.

Multivariate Determination of Total Sugar Content and Ethanol in Bioethanol Production Using Carbon Electrodes Modified with MWCNT/MeOOH and Chemometric Data Treatment

“…Before the modification with metal nanoparticles MWCNTs were purified with an acidic pre‐treatment. Briefly, the MWCNTs were dispersed in a 3 : 1 mixture of concentrated H 2 SO 4 /HNO 3 acids using an ultrasonic bath for 90 min . Purified MWCNTs were then used for further modification with different metal nanoparticles.…”

“…This modification was performed following the protocol reported by Cipri et al. . Briefly, a flask was prepared with a solution consisting of PdCl 2 (0.014 mol L −1 ), H 3 BO 3 (0.157 mol L −1 ) and NH 4 F (0.0667 mol L −1 ).…”

Resolution of galactose, glucose, xylose and mannose in sugarcane bagasse employing a voltammetric electronic tongue formed by metals oxy-hydroxide/MWCNT modified electrodes

“…Briefly, the MWCNTs were dispersed in a 3:1 mixture of concentrated H 2 SO 4 /HNO 3 acids using an ultrasonic bath for 90 min [39]. Purified…”

“…This modification was performed following the protocol reported by Cipri et al [39]. Briefly, a flask was prepared with a solution consisting of PdCl 2 (14.0×10 -3 mol…”

A novel bio-electronic tongue using different cellobiose dehydrogenases to resolve mixtures of various sugars and interfering analytes

“…and electrodes modified with metal nanoparticles, ion selective sensors (ISEs) covered with a PVC membrane or electrodes with catalysts (Cetó et al 2012;Gutierrez et al 2008;Wilson et al 2015). In the range of surface modified electrodes the possibilities are almost infinite, from nanomaterials to biomolecules, e.g., carbon nanotubes, nanoparticles, enzymes, aptamers and a combination of these modifiers citing just a few (Cipri and del Valle 2014;Ocaña et al 2014;Pacios et al 2009). Most of such materials have been exploitable for ETs systems.…”