期刊
ELECTROCHIMICA ACTA
卷 247, 期 -, 页码 229-240出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.06.131
关键词
palladium nanoparticle; poly(acrylic acid); graphene oxide; electrocatalytic activity; formalin oxidation; flow injection amperometry
资金
- Higher Education Research Promotion and National Research University Project of Thailand (HERP-NRU)
- Center of Excellence for Innovation in Chemistry (PERCH-CIC)
- Commission of Higher Education, Thailand
- Faculty of Science Research Fund, Prince of Songkla University [1-2557-02-002]
- Trace Analysis and Biosensor Research Center (TAB-RC), Graduate School and Faculty of Science, Prince of Songkla University, Hat Yai, Thailand
An excellent electrocatalytic activity, repeatability and stability of electrochemical sensor for formalin detection was fabricated based on a homogeneous distribution of ellipsoidal palladium nanoparticle (PdNPs) on poly (acrylic acid)-functionalized graphene oxide (PAA-GO) modified on a glassy carbon electrode (GCE) (PdNPs-PAA-GO/GCE) with incorporated flow injection amperometry (FI-Amp). Homogeneous distribution of ellipsoidal palladium nanoparticles (PdNPs) were dispersed on PAA-GO via an electroless deposition method. The surface morphology and electrochemical behavior of the PdNPs-PAA-GO/GCE were characterized by transmission electron microscopy, fourier transform infrared spectroscopy, cyclic voltammetry and amperometry. The PdNPs-PAA-GO/GCE exhibited excellent electrocatalytic activity toward formalin oxidation. Then this modified electrode was incorporated with FI-Amp for formalin sensor development. In order to obtain good analytical performances, many parameters such as the amount of PdNPs-PAA-GO, applied potential, flow rate and sample volume were optimized. Under optimal conditions, this sensor provided a wide linear range, 50-50,000 mmol L-1, with high sensitivity (320 mA mmol L-1 cm(-2)). The limit of detection and limit of quantitation were 16 mmol L-1 and 53 mmol L-1, respectively. This proposed sensor exhibited good repeatability (RSD <3.5%), excellence stability (RSD = 1.5%, n = 500) and high sample throughput (60 samples h(-1)). This method was applied to the determination of formalin in soaked fresh food samples with satisfactory recovery. (C) 2017 Elsevier Ltd. All rights reserved.
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