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Optimum Copper-Palladium Catalyst from a Combinatorial Library for Sensitive Non-Enzymatic Glucose Sensors
AuthorHassel, Achim Walter ; Pötzelberger, Isabella ; Mardare, Cezarine Cela ; Uiberlacker, Lisa Maria ; Hild, Sabine
Published in
Electrocatalysis, 2018, Vol. 9, Issue 3, page 359-369
PublishedSpringer US, 2018
Document typeJournal Article
Keywords (EN)Copper-palladium / Co-sputtered combinatorial material library / Thin film / Glucose / Electrocatalytic oxidation
URNurn:nbn:at:at-ubl:3-1634 Persistent Identifier (URN)
 The work is publicly available
Optimum Copper-Palladium Catalyst from a Combinatorial Library for Sensitive Non-Enzymatic Glucose Sensors [3.68 mb]
Abstract (English)

The optimum activity for glucose electrocatalytic oxidation was found by screening along a large spread co-sputtered combinatorial copper-palladium library (2.6 at.% to 39.2 at.% Pd) in neutral media using flow-type scanning droplet cell microscopy (FT-SDCM). The elemental composition and the surface topography were characterized along the compositional spread using energy dispersive X-ray spectroscopy (EDX), as well as atomic force microscopy (AFM). The study proves that the entire range of alloys can be implemented in glucose detection. The highest catalytic effect was obtained at a Pd content of 8.2 at.% (E SHE = 0.58 V) with a current density value of 7.33 mA cm2. The suitability for being used as quantitative and qualitative glucose sensor was demonstrated. The calibration performed in phosphate buffer solution containing different amounts of glucose revealed two linear regions with different sensitivities towards the quantitative glucose detection. The highest sensitivity was determined in the range of 025 mM glucose, which is indicated by an increase of 81.2 A cm2 mM1, normalized to the stepwise increase of 1 mM glucose. Also, a good long-term stability, reproducibility (relative standard deviation 5%), as well as the selective sensitivity to glucose oxidation were demonstrated by performing measurements in the presence of other compounds found in blood (e.g., ascorbic acid and uric acid).

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