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Abstract
A novel electrochemical sensor for formaldehyde determination was fabricated by using the Pd-graphene nanohybrides. Pd-graphene nanohybrids were prepared via a concise chemical reduction method. Raman spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM) were used for the characterization of structure and morphology of the nanohybrids. The result showed that Pd nanoparticles were uniformly dispersed and were well-separated on the graphene sheets. The Pd-graphene nanohybrids were dissolved in Nafion and modified on the glassy carbon electrode to fabricate the electrochemical sensor. This proposed electrochemical sensor performed excellent electrocatalytic activity toward formaldehyde oxidation in alkaline medium. The peak current was linearly related to the formaldehyde concentration in the range of 7.75 µM to 62.0 µM with the detection limit of 3.15 µM. The highly sensitive and robust graphene based Pd nanohybrids sensor offers a promising and practical tool for formaldehyde sensing and chemical analysis.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (No: 21175086 and 21145005), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No: 20090015) and the Shanxi Province Science and Technology Research Project (No: 20100321065).
Notes
a Pd nanoparticles electrodeposited on carbon ionic liquid electrode.
b nanoparticle Pd-modified TiO2 electrode.