Direct Oxidation Growth of CuO Nanowires from Copper‐Containing Substrates

Abstract

Controlling the growth of semiconducting nanowires with desired properties on a reproducible basis is of particular importance in realizing the next-generation electronic and optoelectronic devices. Here, we investigate the growth of cupric oxide (CuO) nanowires by direct oxidation of copper-containing substrates at500∘Cfor 150 minutes at various oxygen partial pressures. The substrates considered include a low-purity copper gasket, a high-purity copper foil, compacted CuO andCu2Othin layers, and layered Cu/CuO and Cu/Cu2Osubstrates. The morphology, composition, and structure of the product CuO nanowires were analyzed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, and UV-Visible absorption. Selected oxidation processes have been monitored using a thermogravimetric analyzer. The layering structure of the substrate after oxidation was analyzed to elucidate the growth mechanism of CuO nanowires.

Synthesis and optical properties of CuO nanostructures obtained via a novel thermal decomposition method

“…CuO is an important p-type semiconductor oxide with a narrow band gap of about (1.2-1.4 eV) at room temperature [6,7]. In addition to the previous technological applications, CuO is particularly used as a fundamental material in high-Tc superconductors [8,9] and battery electrodes [10,11].…”

Structured graphene metamaterial selective absorbers for high efficiency and omnidirectional solar thermal energy conversion

“…5e, over 24 h of heating in air at 100°C, the Raman spectra of SGM absorbers with and without thermal treatments keep almost the same. Moreover, no Raman peak and XRD pattern of copper oxide [38][39][40][41] in the short wavenumber regime of Raman spectra (Fig. 5e) and XRD spectra ( Supplementary Fig.…”

A quantitative assessment of the hydrogen storage capacity of the UK continental shelf

“…The H21 Leeds City Gate project produced by utility network provider Northern Gas Networks, focused on the provision of heat through a 100% hydrogen gas network for the Yorkshire city of Leeds in northern England, UK [42]. This was based on converting the existing natural gas network of the city entirely to hydrogen.…”