Expanded graphite decorated with PdO@C nanoparticles for individual and simultaneous sensing of multiple phenols

• Published in: Sensors and actuators. B, Chemical Vol. 291; pp. 362 - 368
• Main Authors: Zheng, Gehua, Zhang, Yuanyuan, Nie, Tianming, Jiang, Xingmao, Wan, Qijin, Li, Yawei, Yang, Nianjun
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.07.2019; Elsevier Science Ltd
• Subjects: Catechol; Detection; Electrochemical sensors; Electrons; Expanded graphite; Graphite; Hydroquinone; Metal oxide nanoparticles; Nanoparticles; Palladium; Phenols; Photoelectrons; Tetrabromobisphenol A; Transmission electron microscopy; Phenols; Expanded graphite; Metal oxide nanoparticles; Electrochemical sensors
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2019.04.072

[Display omitted] •Improved electrochemical sensing properties of PdO@C nanoparticles supported on expanded graphite.•Realization of highly-sensitive detection of tetrabromobisphenol A, hydroquinone, and catechol.•Accurate determination of tetrabromobisphenol A, hydroquinone, and catechol in water samples. Sensitive, selective, and reproducible monitoring of multiple phenols simultaneously needs an electrochemical interface with a large surface area and a big amount of active sites. Herein, expanded graphite (EG) as the supporter is decorated with the sensing material of carbon-coated palladium oxide (PdO@C) nanoparticles. After its characterization using transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical techniques, this composite based electrochemical interface has been utilized for the voltammetric sensing of tetrabromobisphenol A (TBBPA), hydroquinone (HQ), and catechol (CC). Compared with either EG or PdO@C based interfaces, this one delivers much enhanced redox currents for three phenols. Individual and simultaneous detection of TBBPA, HQ, and CC has been realized at nano-molar levels. The calculated detection limits are 1.3, 26, and 17 nM for TBBPA, HQ, and CC, respectively. Such an interface thus owns great prospect in constructing a universal platform for individual and simultaneous detection of multiple phenols in different samples.