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Wang G.,Anhui Normal University | Zhu Y.,Anhui Normal University | Nan H.,Anhui Normal University | Nan H.,Key Laboratory for Functional Molecular Solids | And 4 more authors.
Micro and Nano Letters | Year: 2013

A report is presented on a novel non-enzymatic amperometric glucose sensor based on three-dimensional porous Cu, which was directly reduced by hydrogen from Cu(OH)2. The surface morphology of the synthesised nanoporous Cu was characterised using field-emission scanning electron microscopy and X-ray powder diffraction. Compared with the commercial Cu nanoparticles, the nanoporous Cu modified electrode shows better catalysis to glucose, which is attributed to the special porous Cu structure providing a favourable microenvironment for glucose adsorbed in large quantity. The interesting comparative study of different cross-linking agents for the immobilisation of nanoporous Cu reports that nafion, chitosan and multi-walled carbon nanotubes (MWCNTs) can all improve the catalysis effect of porous Cu on the glucose but the MWCNT shows the best sensitive response and stability. The MWCNT plays an especially important role in stability improvement by 20% of the efficiency. Under optimal conditions, a linear dependence of the catalytic current upon glucose concentration was obtained in the range of 5.0 × 10 -7-2.0 × 10-3 M with a detection limit of 1.0 × 10-7 M, a high sensitivity of 20.11 μA μM-1, good stability and no current response from interfering species at the approximate physiological concentration level. © The Institution of Engineering and Technology 2013.

Zhang X.,Anhui Normal University | Zhang X.,Key Laboratory for Functional Molecular Solids | Wang L.,Anhui Normal University | Wang L.,Key Laboratory for Functional Molecular Solids | And 6 more authors.
Electrochemistry Communications | Year: 2012

Cu 2S nanoplates (named Cu 2S NPs) were synthesized on the Cu substrate by a simple etching method. The morphology and structure of Cu 2S NPs were characterized by scanning electron microscopy and X-ray diffraction. Then the Cu-Cu 2S composites were directly used as electrode to nonenzymatic detect glucose. The electrochemical study has demonstrated that the Cu-Cu 2S electrode shows a perfect catalytic effect on the glucose due to the large surface area of Cu 2S nanoplates and high electric conductivity of Cu rod. At an applied potential of - 0.10 V, the sensor produces an ultra high sensitivity of 361.58 μA mM - 1 with a low detection limit of 0.1 μM (S/N = 3). What's more, the proposed sensor displays excellent selectivity, good stability, and satisfying repeatability. © 2012 Elsevier B.V.

Ji R.,Anhui Normal University | Ji R.,Key Laboratory for Functional Molecular Solids | Wang L.,Anhui Normal University | Wang L.,Key Laboratory for Functional Molecular Solids | And 8 more authors.
ACS Applied Materials and Interfaces | Year: 2013

Silver oxide nanowire arrays (Ag2O NWAs) were first synthesized on a copper (Cu) rod by a simple and facile wet-chemistry approach without using any surfactants. The as-synthesized Ag2O NWA/Cu rod not only can be used as an integrated electrode (called a Ag2O NWA/CRIE) to detect hydrazine (HZ) but also can serve as the catalyst layer for a direct HZ fuel cell. The current density of HZ oxidation on Ag2O NWA (94.4 mA cm-2) is much bigger than that on a bare Cu rod (3.9 mA cm -2) at -0.6 V, and other Ag2O NWAs have the lowest onset potential (-0.85 V). This suggests that a Ag2O NWA integrated electrode has potential application in catalytic fields that contain the HZ fuel cell. © 2013 American Chemical Society.

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