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Fast synthesis of platinum nanopetals and nanospheres for highly-sensitive non-enzymatic detection of glucose and selective sensing of ions.

Scientific reports (2015-10-31)
Irene Taurino, Gabriella Sanzó, Franco Mazzei, Gabriele Favero, Giovanni De Micheli, Sandro Carrara
ABSTRACT

Novel methods to obtain Pt nanostructured electrodes have raised particular interest due to their high performance in electrochemistry. Several nanostructuration methods proposed in the literature use costly and bulky equipment or are time-consuming due to the numerous steps they involve. Here, Pt nanostructures were produced for the first time by one-step template-free electrodeposition on Pt bare electrodes. The change in size and shape of the nanostructures is proven to be dependent on the deposition parameters and on the ratio between sulphuric acid and chloride-complexes (i.e., hexachloroplatinate or tetrachloroplatinate). To further improve the electrochemical properties of electrodes, depositions of Pt nanostructures on previously synthesised Pt nanostructures are also performed. The electroactive surface areas exhibit a two order of magnitude improvement when Pt nanostructures with the smallest size are used. All the biosensors based on Pt nanostructures and immobilised glucose oxidase display higher sensitivity as compared to bare Pt electrodes. Pt nanostructures retained an excellent electrocatalytic activity towards the direct oxidation of glucose. Finally, the nanodeposits were proven to be an excellent solid contact for ion measurements, significantly improving the time-stability of the potential. The use of these new nanostructured coatings in electrochemical sensors opens new perspectives for multipanel monitoring of human metabolism.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Potassium chloride solution, 0.075 M, sterile-filtered, BioXtra, suitable for cell culture
Sigma-Aldrich
Potassium chloride, for molecular biology, ≥99.0%
Sigma-Aldrich
Sulfuric acid, 99.999%
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Potassium chloride, ≥99.99% trace metals basis
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Tetrahydrofuran, anhydrous, contains 250 ppm BHT as inhibitor, ≥99.9%
Sigma-Aldrich
Potassium chloride, 99.999% trace metals basis
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Potassium chloride, AnhydroBeads, −10 mesh, 99.999% trace metals basis
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Potassium chloride solution, BioUltra, for molecular biology, ~1 M in H2O
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Bis(2-ethylhexyl) sebacate, ≥97.0% (GC)
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D-(+)-Glucose, BioUltra, anhydrous, ≥99.5% (sum of enantiomers, HPLC)
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Potassium chloride, BioUltra, for molecular biology, ≥99.5% (AT)
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Potassium chloride, BioXtra, ≥99.0%
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Glutaraldehyde solution, Grade I, 70% in H2O, specially purified for use as an electron microscopy fixative or other sophisticated use
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Glutaraldehyde solution, 50% in H2O, suitable for photographic applications
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Sulfuric acid, puriss. p.a., 95-97% (T)
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Dulbecco′s Modified Eagle′s Medium, Without glucose, L-glutamine, phenol red, sodium pyruvate and sodium bicarbonate, powder, suitable for cell culture
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D-(+)-Glucose, ACS reagent
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D-(+)-Glucose, ≥99.5% (GC)
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D-(+)-Glucose, suitable for mouse embryo cell culture, ≥99.5% (GC)
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D-(+)-Glucose, powder, BioReagent, suitable for cell culture, suitable for insect cell culture, suitable for plant cell culture, ≥99.5%
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D-(+)-Glucose, BioXtra, ≥99.5% (GC)
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D-(+)-Glucose, Hybri-Max, powder, BioReagent, suitable for hybridoma
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Potassium chloride, powder, BioReagent, suitable for cell culture, suitable for insect cell culture, ≥99.0%
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Glutaraldehyde solution, Grade I, 25% in H2O, specially purified for use as an electron microscopy fixative
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Glutaraldehyde solution, Grade II, 25% in H2O
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Potassium chloride, AnhydroBeads, −10 mesh, 99.99% trace metals basis
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Bis(2-ethylhexyl) sebacate, technical grade, 90%
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Tetrahydrofuran, anhydrous, ≥99.9%, inhibitor-free
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Glutaraldehyde solution, Grade I, 50% in H2O, specially purified for use as an electron microscopy fixative or other sophisticated use
Sigma-Aldrich
Glutaraldehyde solution, Grade I, 8% in H2O, specially purified for use as an electron microscopy fixative or other sophisticated use