Morphology Of CuO Nanostructures Research Articles

Copper oxide nanosheets prepared by facile microplasma electrochemical technique with photocatalytic and bactericidal activities

Copper oxide (CuO) nanostructures are synthesized via a simple and novel atmospheric pressure microplasma technique without using any surfactant. The effect of electrolyte concentration on structure, size, and morphology of CuO nanostructures has been investigated by X-ray diffraction (XRD), laser-induced breakdown spectroscopy (LIBS), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The results revealed the formation of highly crystalline single phase CuO, exhibiting a monoclinic structure. SEM images have shown an interpenetrating self-assembled nanosheets (NS) with varying sizes. The energy bandgap of the samples is estimated between 2.0 and 2.73 eV. The antibacterial activity of CuO NS demonstrates significant bactericidal efficiency against gram-negative bacteria. In addition, these NS are checked for the degradation of organic dyes such as Rhodamine B and methyl orange under sunlight irradiation which showed significant degradation, indicating excellent photocatalytic activity. It has been found that CuO NS are promising material for pharmaceutical and biomedical applications because of its attractive photocatalytic and antibacterial properties.

Morphology Controlled CuO Nanostructures for Efficient Catalytic Reduction of 4-Nitrophenol

Catalytic transformation of nitroaromatic compounds in wastewater using nanostructured catalysts is a promising method for wastewater treatment. Here, we report a systematic study on morphology-dependent catalytic activity of CuO nanostructures for efficient reduction of 4-nitrophenol (4-NP) in water. The morphology of CuO nanostructures was controllably varied from nanorods, nanosheets and hierarchical 3D flower-like structures by simply varying ammonia concentration in a simple wet chemical approach. Catalytic transformation of toxic 4-NP into useful 4-aminophenol by the prepared nanostructured CuO samples were investigated. The impact of morphology on the catalytic activity of nanostructured CuO catalysts was examined. It was observed that hierarchical 3D flower-like CuO catalysts show enhanced catalytic activity as compared to nanorods and nanosheets. The origin of this morphology-dependent catalytic activity of CuO nanostructures is discussed.

Effect of bi-solvents on the Morphology of CuO Nanostructures Using Soft Template

Nanotechnology is stable through actual minor fragments through substantial in alone or their management to produce new large scale material, at the Nano-scale materials are reformed after that of superior scale, the Nano-scale is the size series from almost 1nm to 100nm and nanotechnology is an aiding technology that consents us to changer sources with improved , totally new-fangled assets. The revolutionary advancement in the field of nanoscience and nanotechnology has explored variety of due applications in various fields. Particularly in the field of sensing the nanomaterials have wide spectrum due to the fact of high sensitivity and low concentration limit of recognition for the sensor device. The present study is focused on the synthesis of CuO nanostructures with XRD, SEM, characterization and soft templates for hydrothermal method techniques for the purpose of CuO nanostructures sample.

Surfactant-free Synthesis of CuO with Controllable Morphologies and Enhanced Photocatalytic Property

A green synthesis for nanoleave, nanosheet, spindle-like, rugby-like, dandelion-like and flower-like CuO nanostructures (from 2D to 3D) is successfully achieved through simply hydrothermal synthetic method without the assistance of surfactant. The morphology of CuO nanostructures can be easily tailored by adjusting the amount of ammonia and the source of copper. By designing a time varying experiment, it is verified that the flower- and dandelion-like CuO structures are synthesized by the self-assembly and Ostwald ripening mechanism. Structural and morphological evolutions are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectra. Additionally, the CuO nanostructures with different morphologies could serve as a potential photocatalyst on the photodecomposition of rhodamine B (RhB) aqueous solutions in the presence of H2O2 under visible light irradiation.

An amperometric sensitive dopamine biosensor based on novel copper oxide nanostructures

It is highly important to explore the influence of counter anions on the morphology in order to have a desired nanostructure with unique properties. Therefore, in this research work the influence of counter anions on the morphology of copper oxide (CuO) nanostructures is presented using copper chloride and copper acetate salts. A significant role of counter anions on the morphology of CuO nanostructures is observed. The hydrothermal method is used to carry out the synthesis of CuO nanomaterial. The prepared CuO nanostructures are characterized by scanning electron microscopy and X-ray diffraction techniques. The prepared CuO nanomaterial exhibits porous nature with thin nanowires and sponge like morphologies. The dopamine sensing application was carried for exploring the electrocatalytic properties of CuO nanostructures. The presented dopamine biosensor exhibited wide linear range for detection of dopamine from 5 to 40 µM with sensitivity of 12.8 µA mMź1 cmź2. The limit of detection and limit of quantification were estimated in order 0.11 and 0.38 µM respectively. The developed dopamine biosensor is highly sensitive, selective, stable and reproducible. The common interfering species such as glucose, ascorbic acid and uric acid showed negligible change in the current when same concentration of dopamine and these interfering species was used. The fabricated biosensor could be used for the determination of dopamine from real blood samples.

CuO nanostructures: Optical properties and morphology control by pyridinium-based ionic liquids

Copper oxide nanostructures have been synthesized by a simple reflux method in aqueous medium of pyridinium based ionic liquids. The structural and optical properties of CuO nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectroscopy (PL) and UV–visible. The morphologies of the nanostructures can be controlled by changing the amount of NaOH and ionic liquids. The results show that the use identical pyridinium based ionic liquids in ratio of 4:1 NaOH/Cu(OAc)2⋅H2O yield minor differences in morphology of CuO nanostructures. Different morphologies of CuO nanostructures were obtained by changing the ratio NaOH/Cu(OAc)2⋅H2O to 2:1. Ionic liquids play an important role on optical properties of CuO nanostructures. The results of optical measurements of the CuO nanostructures illustrate that band gaps are estimated to be 1.67–1.85eV. PL patterns studies show that the ionic liquids can be effect on PL patterns of the samples. The reasons of these phenomena are discussed.

Enhancement in supercapacitive properties of CuO thin films due to the surfactant mediated morphological modulation

The complex hierarchical CuO nanostructures (woolen clumps, stacked nanosheets and nanobuds) have been developed through a chemical bath deposition method using surfactant assisted approach. The morphology of CuO nanostructures can be easily tuned using different surfactants as a soft chemical template. Nanobuds clusters deliver a superior 3D conductive framework, which allows well electrolytic accessible surface area and provides a shortest path for ions. The porous and well defined nanostructure renders a high contact surface area for the intercalation/deintercalation of ions into/out of active materials and reduces the path length for electrolyte ion transport. The maximum specific capacitance of 396Fg−1 at 5mVs−1 is calculated for CuO nanobuds structured electrode. Moreover, all the CuO nanostructures reveal better power performance, excellent rate as well as long term cycling stability. Such a study will encourage for the preparation of 3D nanostructures framework of the other materials using surfactant assisted approach.

Tailoring CuO nanostructures for enhanced photocatalytic property

We report on one-pot synthesis of various morphologies of CuO nanostructures. PEG200 as a structure directing reagent under the synergism of alkalinity by hydrothermal method has been employed to tailor the morphology of CuO nanostructures. The CuO products have been characterized by XRD, SEM, and TEM. The morphologies of the CuO nanostructures can be tuned from 1D (nanoseeds, nanoribbons) to 2D (nanoleaves) and to 3D (shuttle-like, shrimp-like, and nanoflowers) by changing the volume of PEG200 and the alkalinity in the reaction system. At neutral and relatively low alkalinity (OH−/Cu2+≤3), the addition of PEG200 can strongly influence the morphologies of the CuO nanostructures. At high alkalinity (OH−/Cu2+≥4), PEG200 has no influence on the morphology of the CuO nanostructure. The different morphologies of the CuO nanostructures have been used for the photodecomposition of the pollutant rhodamine B (RhB) in water. The photocatalytic activity has been correlated with the different nanostructures of CuO. The 1D CuO nanoribbons exhibit the best performance on the RhB photodecomposition because of the exposed high surface energy {−121} crystal plane. The photocatalytic results show that the high energy surface planes of the CuO nanostructures mostly affect the photocatalytic activity rather than the morphology of the CuO nanostructures. Our synthesis method also shows it is possible to control the morphologies of nanostructures in a simple way.

CuO Nanostructures As Quartz Crystal Microbalance Sensing Layers for Detection of Trace Hydrogen Cyanide Gas

In this work, quartz crystal microbalance (QCM) sensors for detection of trace hydrogen cyanide (HCN) gas were developed based on nanostructural (flower-like, boat-like, ellipsoid-like, plate-like) CuO. Responses of all the sensors to HCN were found to be in an opposite direction as compared with other common volatile substances, offering excellent selectivity for HCN detection. The sensitivity of these sensors is dependent on the morphology of CuO nanostructures, among which the plate-like CuO has the highest sensitivity (2.26 Hz/μg). Comparison of the specific surface areas of CuO nanostructures shows that CuO of higher surface area (9.3 m(2)/g) is more sensitive than that of lower surface area (1.5 m(2)/g), indicating that the specific surface area of these CuO nanostructures plays an important role in the sensitivity of related sensors. On the basis of experimental results, a sensing mechanism was proposed in which a surface redox reaction occurs between CuO and Cu(2)O on the CuO nanostructures reversibly upon contact with HCN and air, respectively. The CuO-functionalized QCM sensors are considered to be a promising candidate for trace HCN gas detection in practical applications.

Synthesis of nanostructures of copper compounds and their hybridisation with titanate nanosheets

Our results in the field of adopting the chemical bath deposition method (CBD) for the deposition of the nanostructures of copper compounds are presented in this work. The deposition of copper compounds by means of the CBD method was carried out at the water solution of copper nitrate (acetate) salts and hexamethylenetetramine. There are two distinct periods in the deposition of copper compounds in the same bath. At the shorter deposition time the good quality nanocrystals of the copper hydroxy nitrate (acetate) salts with a different morphology are obtained. Decomposition of the copper salts to the CuO in the water bath can be observed after several hours of the copper hydroxy salts deposition. The SEM images and the XRD patterns of the CuO layer, which was produced by decomposition of copper hydroxy salts by the CBD method, show a morphology and texture different from the CuO layer prepared by thermal decomposition of the deposited copper hydroxy salts at an elevated temperature. It has been suggested that the main force in decomposition of copper hydroxy salts to CuO in the course of CBD process may be related with a strain, which exists between the CuO nanoparticles on the modified glass substrate and the deposited copper hydroxy salt. The decomposition reaction of copper hydroxy salts in the solid phase may be accelerated by a strain. The influence of the strain on the morphology of CuO nanostructures is demonstrated on the basis of the basic copper nitrate salt hybridised with titanate nanosheets.