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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Carbon black supported Au-Pd core-shell nanoparticles within a dihexadecylphosphate film for the development of hydrazine electrochemical sensor

Full text
Author(s):
Deroco, Patricia B. [1] ; Melo, Iasmim G. [2] ; Silva, Lays S. R. [2] ; Eguiluz, Katlin I. B. [2] ; Salazar-Banda, Giancarlo R. [2] ; Fatibello-Filho, Orlando [1]
Total Authors: 6
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem, POB 676, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Tiradentes, PEP, Res & Technol Inst, Electrochem & Nanotechnol Lab, BR-49032490 Aracaju, SE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 256, p. 535-542, MAR 2018.
Web of Science Citations: 18
Abstract

An amperometric method for the determination of hydrazine (HDZ) using a glassy carbon (GC) electrode modified with carbon black supported Au-Pd core-shell structured nanoparticles (Au@Pd/CB) within dihexadecylphosphate (DHP) film (Au@Pd/CB-DHP/GCE) is proposed. Au@Pd nanoparticles were synthesized by chemical reduction of AuCl3 and PdCl2 using ethylene glycol as a reducing agent, and the nanoparticles supported on CB were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. The proposed Au@Pd/CB-DHP/GCE and CB-DHP/GCE (without Au@Pd) electrodes were used to investigate the electrochemical behavior of HDZ using cyclic voltammetry. When the Au@Pd/CB-DHP/GCE was used, an electrocatalytic effect was observed, the analytical signal was substantially increased (87%) and the oxidation potential decreased, i.e. in 728 mV. Additionally, the apparently heterogeneous electron transfer rate constant (k(0)) obtained for the Au@Pd/CB-DHP/GCE (0.15 cm s(-1)) was about two orders of magnitude greater than that obtained using the CB-DHP/GCE (0.068 cm s(-1)). Under the optimized conditions for the amperometric technique, a linear analytical curve for HDZ was obtained in the range of 2.50-88.0 mu mol L-1, with a limit of detection of 0.23 mu mol L-1 (0.0074 ppm). The proposed method was satisfactorily applied to determine the concentration of HDZ in natural lake and tap water samples. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/07919-2 - Preparation of electrodes with new carbon-based materials for applications in electroanalytical
Grantee:Patrícia Batista Deroco
Support Opportunities: Scholarships in Brazil - Doctorate