Shale-like copper nanostructure was synthesized for the first time from a
water-in-oil microemulsion medium comprising Triton? X-100/cyclohexane/water
ternary system. The nanoshales were synthesized ...through chemical reduction
by hydrazinium hydroxide in alkaline medium. The nanoshales were
characterized by scanning electron microscopy (SEM) and X-ray diffraction
(XRD) patterns.
nema
In this study, Copper (Cu) nanostructures (CuNS) were electrochemically deposited on a film of multiwall carbon nanotubes (MWCNTs) modified pencil graphite electrode (MWCNTs/PGE) by cyclic ...voltammetry method to fabricate a CuNS–MWCNTs composite sensor (CuNS–MWCNT/PGE) for hydrazine detection. Scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX) were used for the characterization of CuNS on the MWCNTs matrix. The composite of CuNS-MWCNTs was characterized with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The preliminary studies showed that the proposed sensor have a synergistic electrocatalytic activity for the oxidation of hydrazine in phosphate buffer. The catalytic currents of square wave voltammetry had a linear correlation with the hydrazine concentration in the range of 0.1 to 800μM with a low detection limit of 70nM. Moreover, the amperometric oxidation current exhibited a linear correlation with hydrazine concentration in the concentration range of 50–800μM with the detection limit of 4.3μM. The proposed electrode was used for the determination of hydrazine in real samples and the results were promising. Empirical results also indicated that the sensor had good reproducibility, long-term stability, and the response of the sensor to hydrazine was free from interferences. Moreover, the proposed sensor benefits from simple preparation, low cost, outstanding sensitivity, selectivity, and reproducibility for hydrazine determination.
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•The Copper nanostructures (CuNS) were prepared by cyclic voltammetry deposition.•The CuNS-MWCNT/PGE sensor shows high activity toward hydrazine (N2H4).•The proposed sensor exhibits a wide linear range (0.1 to 800μM), low detection limit (70nM), high sensitivity and stability for hydrazine.
Large-scale copper nanowall array on the bulk Fe–Co–Ni alloy substrate has been prepared in aqueous solution at room temperature via an electroless deposition method. The thickness of the nanowalls ...is about 15
nm. A possible growth mechanism of the nanowalls was proposed. The effects of reaction temperature, reaction time and the amount of critical agent (Fe
3+) on the morphology and crystalline phase of the nanowalls were investigated. Furthermore, the electrochemical performance of Sn film supported on the as-prepared copper nanowalls current collector is enhanced in comparison with that on the commercial copper foil when used as anode for Li-ion batteries with the operating voltage window of 0.01–2.0
V (vs. Li). After 20
cycles, the discharge capacity of Sn–Cu nanowalls anode still remained 365.9
mAh
g
−
1
, that is, 40% retention of the reversible capacity, while the initial charge capacity of Sn film cast on commercial Cu foil was 590
mAh
g
−
1
, dropping rapidly to 260
mAh
g
−
1
only after 10
cycles.
Copper, an old material, is still extensively used nowadays. In this paper, through extremely simple replacement reaction approach, we synthesized various copper nanostructures under ambient ...atmosphere at room temperature. Pure copper, with splendid structures at nanoscale, was acquired by dipping iron plate into solution with copper ions. With different reactant, copper chloride, copper sulfate, copper nitrite and copper acetate, different copper nanostructures are obtained. Using copper chloride, dendrite structure is prepared; and copper sulfate leads to sponge-like structure; while both copper nitrite and copper acetate result into no copper structure. What's more, we discovered that enough long reaction time will lead to the transformation of dendrite copper into sponge-like copper, no matter what copper salt is employed. Addition of silver ions into the reaction system demonstrated the significant influence of copper salt into the synthesis of dendrite silver structures. Finally, the mechanism of the nanostructures formation is investigated thoroughly.
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