Preparation Of CuO Research Articles

Preparation of CuO Nanowires/Ag Composite Substrate and Study on SERS Activity

In this paper, surface-enhanced Raman scattering (SERS) substrates with high detection sensitivity were prepared by thermal oxidation, and magnetron sputtering and the SERS properties of these substrates were studied using methylene blue as probe molecule. The result showed that the SERS substrate has good enhancement effect (analytical enhancement factor ~ 107), stability, and reproducibility. The minimum detection limit for methylene blue can reach 10–9 M. The SERS intensity and the concentration has a linear dependence (R2 > 0.9). This suggests that the substrate has great potential in the detection of biological and chemical substances.

Green synthesis of copper oxide nanoparticles decorated reduced graphene oxide for high sensitive detection of glucose

A non-enzymatic glucose sensor based on pencil graphite electrode (PGE) modified by copper oxide nanoparticles decorated reduced graphene oxide (CuO(NP)/rGO-PGE) was prepared. XRD patterns showed partially electrochemically reduction of GO and monoclinic structure of CuO on the PGE. The prepared CuO(NP)/rGO exhibited a nanoporous structure by scanning electron microscopy (SEM). Transmittance electron microscopy (TEM) revealed copper oxide nanoparticles were well distributed on rGO and had semispherical shapes with diameter 3–5 nm. Cyclic voltammetry at CuO(NP)/rGO-PGE showed the immobilized CuO(NP)s were highly stable in alkaline solutions and had high electrocatalytic activity toward glucose oxidation. Using amperometry, the detection limit of [0.091 (±0.003) μM] and concentration sensitivity of [4760 (±3.2) μA mM−1 cm−2] for glucose was obtained at optimum conditions. The applicability of the sensor was evaluated to determine the glucose concentration in human blood serum samples and the experimental results were comparable with those measured by traditional spectrophotometric methods. The preparation of CuO(NP)/rGO-PGE was reproducible, very simple, fast and inexpensive for practical application.

Preparation of CuO Thin Films by Thermally Oxidized Metallic Cu Films for CdS/CuO Heterojunction Diode

Preparation of CuO Thin Films by Thermally Oxidized Metallic Cu Films for CdS/CuO Heterojunction Diode

A single precursor route to synthesize CuO and CuS nanostructures based on copper ammine and thiourea complexes

The hydrothermal synthesis is reported of copper(II) oxide and copper(II) sulfide nanostructures with different morphologies using ammine (NH3) and thiourea (tu) complexes of copper(I) and copper(II) as the starting materials in the absence of any capping agents/surfactants. Indeed, ammine and thiourea ligands act as the sources of hydroxide and sulfur ions in the preparation of CuO and CuS nanostructures, respectively, as well as central copper ion as the Cu source. This method has the advantages of the simplicity and low cost. The synthesized products were characterized by X-ray diffraction, Fourier transformation infrared spectroscopy and scanning electron microscopy techniques. Further, the effects of precursor concentration, temperature and reaction time on the morphology and size of the nanostructures were studied.

Intensification of heat transfer using PANI nanoparticles and PANI-CuO nanocomposite based nanofluids

The present work deals with the preparation of CuO, polyaniline (PANI) and PANI-CuO nanocomposite by in-situ emulsion polymerization which is subsequently dispersed in water to get PANI and PANI-CuO nanocomposite based nanofluid to study its convective heat transfer performance. The enhancement in the convective heat transfer of PANI and PANI-CuO nanocomposite based nanofluids was investigated by adding 0.1–0.5 volume% PANI and PANI-CuO nanocomposite particles individually (having particle size less than 100nm) in deionized water (basefluid), respectively. Further, the effect of percentage of PANI and PANI-CuO nanocomposite particles and inlet temperature, on convective heat transfer performance was investigated. The experimental results show an enhancement by more than 12% and around 38% in heat transfer coefficient, when 0.5 vol% of PANI and PANI-CuO nanocomposite particles were added to the base fluid, respectively. This is attributed to use of PANI encapsulated CuO nanocomposite particles in nanofluids, which enhances the heat transfer coefficient significantly compared to PANI nanoparticles alone in nanofluid.