Nanoporous copper oxide ribbon assembly of free-standing nanoneedles as biosensors for glucose

Abstract

Inspired by a sequential hydrolysis-precipitation mechanism, morphology-controllable hierarchical cupric oxide (CuO) nanostructures are facilely fabricated by a green water/ethanol solution-phase transformation of Cu(x)(OH)(2x-2)(SO4) precursors in the absence of any organic capping agents and without annealing treatment in air. Antlerite Cu3(OH)4(SO4) precursors formed in a low volume ratio between water and ethanol can transform into a two-dimensional (2D) hierarchical nanoporous CuO ribbon assembly of free-standing nanoneedle building blocks and hierarchical nanoneedle-aggregated CuO flowers. Brochantite Cu4(OH)6(SO4) precursors formed in a high volume ratio between water and ethanol can transform into hierarchical nanoplate-aggregated CuO nanoribbons and nanoflowers. Such 2D hierarchical nanoporous CuO ribbons serving as a promising electrode material for nonenzymatic glucose detection show high sensitivity, a low detection limit, fast amperometric response and good selectivity. Significantly, this green water-induced precursor-hydrolysis method might be used to control effectively the growth of other metal oxide micro-/nanostructures.

CuCo2O4nanowire arrays supported on carbon cloth as an efficient 3D binder-free electrode for non-enzymatic glucose sensing

“…Cu based glucose enzyme-free sensor, 20,34,35 the oxidative current of Cu(II) to Cu(III) positioned at around 0.4 V was not obvious in the CuCo 2 O 4 NWAs, which was agreed well with that of CuO NPs/CC in alkaline solution (green curve in Fig. 4c).…”

“…Copper oxide 19,20 and cobalt oxide 13,21 have attracted more attention for non-enzymatic glucose sensing because of their simple synthesis process, super electrochemical property and good chemical stability. Their mixed metal oxide CuCo 2 O 4 , obtained from replacing Co 2+ in Co 2+ (Co 2 ) 3+ O 4 spinel structure with Cu 2+ , exhibits higher electrical conductivity and electrochemical activity than their monometallic oxides.…”

Selective Photoconversion of Carbon Dioxide into Methanol Using Layered Double Hydroxides at 0.40 MPa

“…TheC u(OH) 2 reference material was light blue (Table 1) and its d-d transitions and the absorption edge caused by O2pt oC u3dt ransitions lay in the visible and UV light regions,respectively.C u(OH) 2 exhibits aflat, sheetlike [17] structure that is somewhat similar to that of LDHs. Thea bsorption edge of Cu(OH) 2 was extrapolated to l = 433 nm (Figure 3Bf), whichi ss hifted significantlyt ol onger wavelengths in comparison to those of Zn-Cu-Ga-CO 3 and Zn-Ga-Cu(OH) 4 Table 1).…”

Anodic copper oxide nanowire and nanopore arrays with mixed phase content: synthesis, characterization and optical limiting response

“…Raman spectra for the copper oxide nanostructures are shown in figure 2(b), where a broad band was observed between 290 and 500 cm −1 for DI anodized copper oxide NWs. The broad band consists of the Raman active B g mode of CuO peaks at 330, 350 and 618 cm −1 [19][20][21]. Raman spectra of Cu 2 O generally correspond to the Raman active Γ25 phonon mode, and are found in peaks associated with the broad band at 515, 555 and 780 cm −1 [22][23][24].…”