Electrodeposition of three-dimensionally assembled platinum spheres on a gold-coated silicon wafer, and its application to nonenzymatic sensing of glucose

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 KClO 4 . 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.

Electrodeposition of Pt nanostructures with reproducible SERS activity and superhydrophobicity

“…K 2 PtCl 4 and H 2 SO 4 were purchased from Alfa Aesar and Merck, respectively. 27 The effects of precursor concentration and species were also examined ( Fig. Au films evaporated onto silicon (Au/Si) wafers (KMAC, Korea) were used as substrates for electrodeposition.…”

“…The formation of these Pt particles was expedited at À0.3 V, and similar electrodeposition behavior has been observed in our previous report. 27 The effects of precursor concentration and species were also examined (Fig. S3 and S4, ESI †).…”

3D porous metal-organic framework as an efficient electrocatalyst for nonenzymatic sensing application

“…A variety of electrode materials have been exploited to enhance the electrocatalytic activity towards glucose and H 2 O 2 since early studies on the electrochemistry of glucose and H 2 O 2 . In the past decade, the electrode materials including metals [5][6][7], metal oxide [8,9], carbon-based materials [10], and composites [11][12][13][14][15][16][17][18] have been extensively investigated as the candidates for the development of effective enzymeless sensors for the determination of glucose or H 2 O 2 .…”

Effect of Anionic Electrolytes and Precursor Concentrations on the Electrodeposited Pt Structures

“…The electrodeposition of monolayer Pt films can be achieved at −0.8 V (vs. Ag/AgCl), at which the deposition of more than one monolayer of Pt is blocked by the capping layers of underpotential deposited H atoms. On the other hand, we have reported different electrodeposition behavior of Pt from solutions containing K 2 PtCl 4 and KClO 4 , wherein Pt spheres of 600∼700 nm in diameter were deposited at −0.8 V . The concentrations of K 2 PtCl 4 for electrodeposition of Pt spheres were between 5 mM and 30 mM, whereas lower K 2 PtCl 4 concentrations (3 mM) were required for monolayer Pt films.…”