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Fabrication of bimetallic Cu/Au nanotubes and their sensitive, selective, reproducible and reusable electrochemical sensing of glucose.

Nanoscale (2015-06-11)
Si Yin Tee, Enyi Ye, Pei Hua Pan, Coryl Jing Jun Lee, Hui Kim Hui, Shuang-Yuan Zhang, Leng Duei Koh, Zhili Dong, Ming-Yong Han
ABSTRACT

Herein, we report a facile two-step approach to produce gold-incorporated copper (Cu/Au) nanostructures through controlled disproportionation of the Cu(+)-oleylamine complex at 220 °C to form copper nanowires and the subsequent reaction with Au(3+) at different temperatures of 140, 220 and 300 °C. In comparison with copper nanowires, these bimetallic Cu/Au nanostructures exhibit their synergistic effect to greatly enhance glucose oxidation. Among them, the shape-controlled Cu/Au nanotubes prepared at 140 °C show the highest electrocatalytic activity for non-enzymatic glucose sensing in alkaline solution. In addition to high sensitivity and fast response, the Cu/Au nanotubes possess high selectivity against interferences from other potential interfering species and excellent reproducibility with long-term stability. By introducing gold into copper nanostructures at a low level of 3, 1 and 0.1 mol% relative to the initial copper precursor, a significant electrocatalytic enhancement of the resulting bimetallic Cu/Au nanostructures starts to occur at 1 mol%. Overall, the present fabrication of stable Cu/Au nanostructures offers a promising low-cost platform for sensitive, selective, reproducible and reusable electrochemical sensing of glucose.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Oleylamine, technical grade, 70%
Sigma-Aldrich
2-Acetamidophenol, 97%
Sigma-Aldrich
Sucrose, puriss., meets analytical specification of Ph. Eur., BP, NF
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Sucrose, BioUltra, for molecular biology, ≥99.5% (HPLC)
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Uric acid, BioXtra, ≥99% (HPLC)
Sigma-Aldrich
Uric acid, ≥99%, crystalline
Sigma-Aldrich
Maltose solution, BioReagent, for molecular biology, ~20% in H2O
Sigma-Aldrich
Sucrose, meets USP testing specifications
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Sucrose, BioXtra, ≥99.5% (GC)
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Sucrose, BioReagent, suitable for cell culture, suitable for insect cell culture, ≥99.5% (GC)
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Sucrose, Grade I, suitable for plant cell culture
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Sucrose, Grade II, suitable for plant cell culture
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Dextrose, meets EP, BP, JP, USP testing specifications, anhydrous
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Sucrose, ≥99.5% (GC)
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Sucrose, ACS reagent
Sigma-Aldrich
Sucrose, for molecular biology, ≥99.5% (GC)
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Sucrose, ≥99.5%
Oleylamine, ≥98% (primary amine)
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L-Ascorbic acid, BioXtra, ≥99.0%, crystalline
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L-Ascorbic acid, reagent grade, crystalline
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D-(+)-Mannose, powder, BioReagent, suitable for cell culture
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L-Ascorbic acid, meets USP testing specifications
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L-Ascorbic acid, reagent grade
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Dopamine hydrochloride
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L-Ascorbic acid, suitable for plant cell culture
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L-Ascorbic acid, suitable for cell culture, suitable for plant cell culture, ≥98%
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L-Ascorbic acid, powder, suitable for cell culture, γ-irradiated
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D-(−)-Fructose, BioReagent, suitable for cell culture, suitable for insect cell culture
Sigma-Aldrich
D-(−)-Fructose, meets USP testing specifications
Sigma-Aldrich
L-Ascorbic acid, puriss. p.a., ACS reagent, reag. ISO, Ph. Eur., 99.7-100.5% (oxidimetric)