Copper Oxide Nanocubes Research Articles

Electrochemiluminescence quenching effect of Cu2O towards flower-like ferric ion-doped g-C3N4 and its application for Cyfra21-1 immunosensing

In this article, ferric ion-doped floral graphite carbon nitride (Fe–CN-3, energy donor) was used to construct the substrate of the immunosensor and copper oxide nanocubes (Cu2O, energy acceptor) were taken as an efficient ECL quenching probe. A sandwich quench electrochemiluminescence (ECL) immunosensor for soluble cytokeratin 19 fragment (Cyfra21-1) detection was preliminarily developed based on a novel resonant energy transfer donor-acceptor pair. Fe–CN-3, a carbon nitride that combines the advantages of metal ion doping as well as morphology modulation, is used in ECL luminophores to provide more excellent ECL performance, which makes a significant contribution to the application and development of carbon nitride in the field of ECL biosensors. The regular shape, high specific surface area and excellent biocompatibility of the quencher Cu2O nanocubes facilitate the labeling of secondary antibodies and the construction of sensors. Meanwhile, as an energy acceptor, the UV absorption spectrum of Cu2O can overlap efficiently with the energy donor's ECL emission spectrum, making it prone to the occurrence of ECL-RET and thus obtaining an excellent quenching effect. These merits of the donor-acceptor pair enable the sensor to have a wide detection range of 0.00005–100 ng/mL and a low detection limit of 17.4 fg/mL (S/N = 3), which provides a new approach and theoretical basis for the clinical detection of lung cancer.

Chemical and morphological stability study of copper oxide nanocubes in controlled and non-controlled atmospheres

Chemical and morphological stability study of copper oxide nanocubes in controlled and non-controlled atmospheres

Active sites-induced decoration of nickel hydroxide nanosheets on copper oxide nanocubes as electroactive material of battery supercapacitor hybrids

Battery supercapacitor hybrids (BSH) comprising battery and supercapacitor-type electrodes can attain high energy/power densities and long cycle life. Copper oxide is regarded as a promising battery-type active material, due to low-cost, high chemical stability and good electrochemical properties. However, poor electrical conductivity and insufficient active sites should be improved to attain high energy storage ability. In this work, a novel battery-type material composed of Ni(OH)2 nanosheets decorated on Cu2O cages is synthesized via a facile solution process for the first time. Less deposition of Ni(OH)2 leads to sparse distribution on Cu2O cages, and full coverage of Ni(OH)2 is achieved via depositing four Ni(OH)2 layers on Cu2O cages. The largest specific capacitance (CF) of 389.1 F/g is achieved at 20 mV/s for the optimized Ni(OH)2 and Cu2O (Ni(OH)2@Cu2O) composite, while the Cu2O electrode shows a smaller CF value of 79.7 F/g. Coating Ni(OH)2 on Cu2O can induce active site formation and enhance electrical conductivity. The Ni(OH)2@Cu2O positive electrode and the active carbon negative electrode are used to assemble a BSH, which presents a maximum energy density of 4.09 Wh/kg at 500 W/kg and excellent cycling ability with CF retention of 70% and Coulombic efficiency higher than 97% after 10,000 charge/discharge cycles.

Copper Oxide Nanocubes Wrapping Metals by Microwave Synthesis

Copper Oxide Nanocubes Wrapping Metals by Microwave Synthesis

Synthesis of cetyl trimethyl ammonium bromide (CTAB) capped copper oxide nanocubes for the remediation of organic pollutants using photocatalysis and catalysis

The aim of this report is to synthesize copper oxide nanocubes (CuO NCs) at room temperature, using sodium borohydride as a reducing agent, and Cetyl Trimethyl Ammonium Bromide (CTAB) as a stabilizing agent. The crystallinity and morphology of the synthesized CuO NCs are investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The optical properties were analyzed by means of UV–visible absorbance and Raman spectroscopy. The existence of specific functional groups and structural stability were established via FTIR spectroscopy and thermogravimetric analysis (TGA). Furthermore, the catalytic efficiency of the as-prepared CuO NCs was tested using catalytic and photocatalytic studies of para-nitrophenol (p-NP) reduction and methylene blue (MB) degradation, respectively. The catalytic results demonstrated the nanocubes’ excellent catalytic and photocatalytic responses with respect to the abatement of p-NP and MB within 50 s and 240 min, with kinetic rate constants of 3.9 × 10−2 s−1 and 6.47 × 10−3 min−1, respectively.

Enhancement in photoelectrochemical ability via re-engineering the band gap of multi-podal titania nanotubes on functionalizing with copper oxide nano-cubes

In this study, multi-podal titania nanotube array (anatase) were fabricated via electrochemical anodization technique on employing third generation electrolyte with suitable and sharp optimization of every anodization parameter. In comparison to conventional titania nanotubes, these nanotubes offer sufficient nanotube wall/electrolyte interface and thereby makes the appreciable reduction in electron hole pair recombination rate by immediate involvement of holes and electrons in oxidation and reduction process, respectively. Furthermore, 85 nm diameter variation in these nanotubes from base diameter 263 nm to top diameter 348 nm makes the incoming light to undergo through graded refractive index which in corresponding increases their light harnessing ability. Although morphological advantage of these nanotubes is being efficiently harnessed in the scattering of incident light but the large band gap 3.2 eV still confines their utility to UV region only. To increase their photo-electrochemical potential under visible light as well, these nanotubes were functionalized suitably with Cu2O nano-cubes without disturbing the nanotube morphology. Under the analysis of their photo-electrochemical potential, the photocurrent density recorded for bare and Cu2O functionalized multi-podal titania nanotube array under visible light source 300 W Xenon lamp (1 sun illumination) was 0.27 mAcm−2 and 0.39 mAcm−2, respectively. The enhancement of ~45% in photocurrent density under visible light illumination is attributed to suitable band edge positions in Cu2O with respect to the band edge positions in TiO2 which in corresponding leads the formation of effective visible light active band gap in the resulting hybrid structure.

Re-Potentiation of β-Lactam Antibiotic by Synergistic Combination with Biogenic Copper Oxide Nanocubes against Biofilm Forming Multidrug-Resistant Bacteria.

Biofilm-associated tissue and device infection is a major threat to therapy. The present work aims to potentiate β-lactam antibiotics with biologically synthesized copper oxide nanoparticles. The synergistic combination of amoxyclav with copper oxide nanoparticles was investigated by checkerboard assay and time-kill assay against bacteria isolated from a burn wound and a urinary catheter. The control of biofilm formation and extracellular polymeric substance production by the synergistic combination was quantified in well plate assay. The effect of copper oxide nanoparticles on the viability of human dermal fibroblasts was evaluated. The minimum inhibitory concentration and minimum bactericidal concentration of amoxyclav were 70 μg/mL and 140 μg/mL, respectively, against Proteus mirabilis and 50 μg/mL and 100 μg/mL, respectively, against Staphylococcus aureus. The synergistic combination of amoxyclav with copper oxide nanoparticles reduced the minimum inhibitory concentration of amoxyclav by 16-fold against P. mirabilis and 32-fold against S. aureus. Above 17.5 μg/mL, amoxyclav exhibited additive activity with copper oxide nanoparticles against P. mirabilis. The time-kill assay showed the efficacy of the synergistic combination on the complete inhibition of P. mirabilis and S. aureus within 20 h and 24 h, respectively, whereas amoxyclav and copper oxide nanoparticles did not inhibit P. mirabilis and S. aureus until 48 h. The synergistic combination of amoxyclav with copper oxide nanoparticles significantly reduced the biofilm formed by P. mirabilis and S. aureus by 85% and 93%, respectively. The concentration of proteins, carbohydrates, and DNA in extracellular polymeric substances of the biofilm was significantly reduced by the synergistic combination of amoxyclav and copper oxide nanoparticles. The fibroblast cells cultured in the presence of copper oxide nanoparticles showed normal morphology with 99.47% viability. No cytopathic effect was observed. Thus, the study demonstrated the re-potentiation of amoxyclav by copper oxide nanoparticles.

Size Control through Scan Rate Modulation: Mapping Water Splitting Efficiency of Micro to Nano Size Cuboidal Copper Oxide Particles

Copper oxide nanocubes were synthesized in green method through potentiodynamic approach in neutral medium and on calcination remarkable chemical, phase and morphological changes resulted. Scan rate is crucial in this potentiodynamic approach to control the size of cuboidal copper oxide from micro to nanometer dimensions and thereby the activity of the film. The scan rate varies from 1 to 100 mV/s at given potential sphere and number of cycles. This attempt focuses on the influence of rate of change in sequential span of potential from 0 V to −0.8 V on nucleation, growth and bandgap of the copper oxide cuboids. Result on water splitting experiments shows that the scan rate controlled nano cuboidal copper oxide enhances the photoactive electron transfer process and thus promotes the splitting of aqueous medium. The carrier lifetime and water splitting efficiency were taken as benchmark to fix the optimum scan rate for the synthesis of cuboidal copper oxide by this approach. Maximum solar to hydrogen efficiency obtained is 0.5% with a carrier lifetime of 2.49 ms for the copper oxide cuboids formed at a scan rate of 20 mV/s.