Abstract
We report on a method of single-step electrodeposition of three-dimensionally (3-D) assembled Pt spheres on a gold-coated silicon wafer. The 3-D interconnected Pt spheres could be electrodeposited by applying a negative potential (−0.8 V, vs. Ag/AgCl) in neutral electrolytes containing KClO4. The application of such a negative potential is not possible in acidic solutions because of the formation of hydrogen. Scanning electron microscopy revealed that the seed Pt particles first grew to a certain size, and then form Pt spheres interconnected in multiple layers. The resulting 3-D assembled Pt sphere structures warrants a high surface area, and this property was utilized for the selective and sensitive amperometric determination of glucose at a working potential of 0.4 V (vs. Ag/AgCl), at near neutral pH values and in the presence of 0.1 M chloride. This straightforward method for the fabrication of 3-D assembled Pt sphere structures offers new opportunities for electroanalytical and electrocatalytic sensing based on porous Pt surfaces.
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A1A2041671). This research was financially supported by the Ministry of Education (MOE) and NRF through the Human Resource Training Project for Regional Innovation (2012H1B8A2026112).
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Roh, S., Kim, J. Electrodeposition of three-dimensionally assembled platinum spheres on a gold-coated silicon wafer, and its application to nonenzymatic sensing of glucose. Microchim Acta 182, 849–854 (2015). https://doi.org/10.1007/s00604-014-1397-0
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DOI: https://doi.org/10.1007/s00604-014-1397-0