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

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]

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

• 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 type: Scholarships in Brazil - Doctorate