Synthesis Of Copper Nanoparticles Research Articles

Bimetallic silver and copper nanoparticles synthesis, characterization and biological evaluation using aqueous leaf extracts of Majorana hortensis

The present work reports the synthesis of bimetallic Ag and Cu nanoparticles using aqueous extract of the leaf of Majorana hortensis plant. The resulting single pot green synthesized nanoparticles were characterized by analytical and spectral techniques. The analysis of elemental composition by EDAX revealed the presence of silver and copper elements in the sample. Transmission electron microscopy images visibly envisaged the formation of spherical nanoparticles with an average size of 10 nm. The formation of the nanoparticles was further manifested through FTIR, UV–visible, and XRD spectral data. The antibacterial activities of the nanoparticles were divulged against some human pathogenic bacteria. It was found that these nanoparticles can inhibit the bacterial growth and hence can be used as antibacterial agents.

Shape control in seed-mediated synthesis of non-elongated Cu nanoparticles and their optical properties.

Shape and surface chemistry control in copper nanoparticle synthesis is an important research area due to a wide range of developing applications of this material in catalysis, energy conversion, sensing and many others. In addition to being an inexpensive and abundant metal, copper is an attractive photocatalyst due to its optical properties in the visible range. Here, we report a facile, tunable and sustainable methodology for synthesizing Pd-seeded Cu nanoparticles with various shapes, including cubes, spheres, raspberry-like particles and cages stabilized with a bilayer of a cationic surfactant in aqueous media. The experimental and theoretical examination of the optical response in the series of synthesized nanoparticles revealed that the low-energy extinction peak is associated with electronic interband transitions in the metal, in contrast to a widely spread attribution of this peak to a plasmonic response in Cu nanoparticles.

Efficacy of Nanoparticles as a research tool to control Mosquito vector: A review

Nanotechnology has revolutionized a wide array of disciplines with its explicit applications in various important fields related to human health and environment. Utilization of nanoparticles to control mosquito menace is one of the most important output of nano research. Mosquitoes are a threat to the worldwide population as they serve as vectors for a variety of diseasecausing organisms. They are responsible for numerous diseases like malaria, dengue, chikungunya, yellow fever, West Nile fever, Japanese encephalitis, etc. Conventional control methods use various chemicals and physical agents which are unable to fulfill the current demand of mosquito control strategy. From the decades, the application of these chemicals are causing a continuous harm to biotic and abiotic components of the ecosystem. Therefore, recent studies are focusing on the novel and safe nanotool that are proving a boon to control measures against mosquito population.Plant mediated nanoparticles approach has shown impressive results in the field of mosquito control biology.Green synthesis of copper, zinc and silver nanoparticles have shown their toxic effects against mosquito.The review provides an insight of green revolution of rapidly growing nano research as a green nanotool control tactics to minimize the damage caused due to mosquito borne diseases.

DsDNA-templated fluorescent copper nanoparticles for the detection of lipopolysaccharides.

The introduction of lipopolysaccharides (LPS) or endotoxins that originate from Gram-negative bacteria into the human blood stream induces a severe immune response that can lead to septic shock, and even death. Hence, the accurate detection of LPS is of great importance in the medical and pharmaceutical sectors. This paper proposes a novel label-free fluorescence assay for the detection of LPS utilizing aptamers and the interference synthesis of dsDNA-templated copper nanoparticles. The assay can be performed at room temperature and does not require expensive reagents. The proposed assay has a limit of detection of 0.95 ng ml-1 of LPS, and the fluorescence emission from the copper nanoparticles was found to vary linearly with the concentration of LPS over a wide range (1 to 105 ng ml-1) with R2 = 0.9877.

Citrus paradisi fruit peel extract mediated green synthesis of copper nanoparticles for remediation of Disperse Yellow 125 dye

Citrus paradisi fruit peel extract mediated green synthesis of copper nanoparticles for remediation of Disperse Yellow 125 dye

Green synthesis of copper nanoparticles using Cinnamomum zelanicum extract and its applications as a highly efficient antioxidant and anti-human lung carcinoma

Cinnamomum zelanicum is one of the popular medicinal plants. The plant has many pharmaceutical uses in traditional medicine. In this study, copper nanoparticles were synthesized using the aqueous extract of Cinnamomum zelanicum. The CuNPs were characterized using different techniques such as EDX, FE-SEM, XRD, and FT-IR. The FE-SEM results confirm spherical morphology for the nanoparticles with size of 19.55 to 69.70 nm. For investigating the antioxidant property of CuNPs, the DPPH test was used in the presence of butylated hydroxytoluene as the positive control. To survey the cytotoxicity and anti-human lung carcinoma effects of CuNPs, MTT assay was used on the NCI-H2126, NCI-H1437, NCI-H1573, and NCI-H661 cell lines. DPPH test revealed similar antioxidant potentials for Cinnamomum zelanicum aqueous extract, CuNPs, and butylated hydroxytoluene. Copper nanoparticles had very low cell viability and anti-lung carcinoma properties dose-dependently against NCI-H2126, NCI-H1437, NCI-H1573, and NCI-H66 cell lines without any cytotoxicity on the normal cell line. The best result of anti-lung carcinoma properties of CuNPs against the above cell lines was seen in the case of the NCI-H2126 cell line. According to the above findings, the copper nanoparticles containing Cinnamomum zelanicum can be administrated in humans for the treatment of several types of lung carcinoma.

Получение наночастиц меди в плазме комбинированного ВЧ+DС разряда

Copper nanoparticles are gaining more and more attention of researchers due to their properties such as high electrical conductivity, well-defined catalytic and antimicrobial effects, etc. The range of their application is extensive – scientific research, medicine, microelectronics and much more. To date, various methods for the synthesis of copper nanoparticles have been developed and successfully applied, in particular chemical, electrochemical, sonochemical, etc. But a significant drawback of such methods is the unsatisfactory purity of the resulting nanomaterial. In this work, a combined high-frequency discharge with an additional constant voltage (HF/DC) was used to obtain Cu particles. A technique for producing nanometer-sized copper particles was developed and studied, and as further analysis using a scanning electron microscope showed, the particles have a spherical shape with diameters ranging from 60 nm to 300 nm.

Green Synthesis of Copper Nanoparticles and its Characterization

Green Synthesis of Copper Nanoparticles and its Characterization

Green Synthesis of Copper Nanoparticles Using Nutmeg Oleoresin and Its Antimicrobial Activity Against Oral Pathogens.

Background: Nanotechnology has a major impact in a variety of applications in the biomedical, engineering, chemical, medicinal and food industries. Nanotechnology is employed to treat microbial infections. Nanotechnology is seen as an emerging scientific field in many aspects, and has a great impact on human daily life with various applications. Nutmeg oleoresin is used as a flavouring agent for foods. Nutmeg oleoresin has strong antimicrobial activity with less cytotoxic activity. Aim: The aim of the study was to analyse the antimicrobial activity of copper nanoparticles synthesized using nutmeg oleoresin Materials and Methods: The nutmeg oleoresin mediated copper nanoparticles was synthesized and confirmed by UV visible spectroscopy and antimicrobial activity was tested aganist staphylococcus aureus, Enterococcus faecalis and Streptococcus mutans and Candida albicans, by agar well diffusion method using respective media. Results: Nutmeg oleoresin mediated copper nanoparticles showed good results for antimicrobial activity. Among the four organisms, Candida albicans (fungal organism) showed more zones of inhibition when compared to Staphylococcus aureus, Streptococcus mutans and Enterococcus faecalis (bacterial organisms). Conclusion: Antimicrobial activity of copper nanoparticles prepared using nutmeg oleoresin is exhibited with significant antimicrobial activity with minimal side effects. Antimicrobial activity of copper nanoparticles showed a maximum zone of inhibition at 100μl.The sensitivity Candida albicans > Staphylococcus aureus> Streptococcus mutans > Enterococcus faecalis.

Preparation, Structural Characterization, and Catalytic Performance of Green Synthesized Cu/Fe <sub>3</sub>O <sub>4</sub> Nanocomposite as Recyclable Nanocatalyst for Synthesis of Pyrano[3,2-C]Chromene Derivatives

In this work, we have described the biogenic synthesized copper nanoparticles being supported over plant phytochemicals modified magnetic Fe3O4 nanoparticles. Hibiscus sabdariffa flower extract was used as a green reducing agent and an excellent stabilizer of the synthesized NPs. The biomolecules are adorned as a protective shell over the core ferrite NPs. Physicochemical characterization of the as-synthaesized Cu-Hibiscus@Fe3O4 nanocomposite was carried out through Fourier transformed infrared spectroscopy (FT-IR), electron microscopy (SEM and TEM), energy dispersive X-ray spectroscopy (EDX), elemental mapping (WDX), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and inductively coupled plasma-optical emission spectroscopy (ICP-OES). The as-synthesized bio-nanomaterial was used as an excellent heterogeneous and magnetically retrievable catalyst in the three-component condensation of 4-hydroxycoumarin, malononitrile and various aldehydes in refluxing aqueous media. A broad range of aromatic aldehydes underwent the reaction to produce diverse pyrano[3,2-c]chromene derivatives in very good yields irrespective of the nature of bearing functional groups or their respective geometrical positions. Due to superparamagentic character, the material was easily magnetically decanted out and recycled for 8 successive times with preservation of its catalytic activity.

Potential Antibacterial Activity of Green Synthesized Copper Nanoparticles and its Characterization

Potential Antibacterial Activity of Green Synthesized Copper Nanoparticles and its Characterization

Sustainable fabrication, optical properties and rapid performance of bio-engineered copper nanoparticles in removal of toxic methylene blue dye in an aqueous medium

Copper nanoparticles have obtained due to the green process in a one-pot reaction at ambient temperature using Malva Sylvesteris leaves extract. The plant extract has used as a reducing and capping agent, providing stability and avoiding oxidation of synthesized copper nanoparticles for more than eight months. Many techniques have exploited for the investigation of optical and physicochemical properties of copper nanoparticles. UV-VIS spectroscopy showed two bands at different locations for the extract and nanoparticles at 340 and 390 ​nm, respectively. Fourier transform infrared spectroscopy confirmed the role of bioactive materials in the plant extract as a reducing and capping agent. X-ray diffraction tool affirmed the crystalline nature of fabricated copper nanoparticles at average (20 ​nm) and showed a centred cubic structure. Field emission scanning electron microscope (FESEM) chart illustrated the roughly spherical shape of distributed copper nanoparticles. The copper nanoparticles showed high-efficiency removal of methylene blue dye in water samples.

Green Synthesis of Copper Oxide Nanoparticles Using Protein Fractions from an Aqueous Extract of Brown Algae Macrocystis pyrifera

Amongst different living organisms studied as potential candidates for the green synthesis of copper nanoparticles, algal biomass is presented as a novel and easy-to-handle method. However, the role of specific biomolecules and their contribution as reductant and capping agents has not yet been described. This contribution reports a green synthesis method to obtain copper oxide nanoparticles (CuO-NPs) using separated protein fractions from an aqueous extract of brown algae Macrocystis pyrifera through size exclusion chromatography (HPLC-SEC). Proteins were detected by a UV/VIS diode array, time-based fraction collection was carried out, and each collected fraction was used to evaluate the synthesis of CuO-NPs. The characterization of CuO-NPs was evaluated by Dynamic Light Scattering (DLS), Z-potential, Fourier Transform Infrared (FTIR), Transmission Electron Microscope (TEM) equipped with Energy Dispersive X-ray Spectroscopy (EDS) detector. Low Molecular Weight (LMW) and High Molecular Weight (HMW) protein fractions were able to synthesize spherical CuO-NPs. TEM images showed that the metallic core present in the observed samples ranged from 2 to 50 nm in diameter, with spherical nanostructures present in all containing protein samples. FTIR measurements showed functional groups from proteins having a pivotal role in the reduction and stabilization of the nanoparticles. The highly negative zeta potential average values from obtained nanoparticles suggest high stability, expanding the range of possible applications. This facile and novel protein-assisted method for the green synthesis of CuO-NPs may also provide a suitable tool to synthesize other nanoparticles that have different application areas.

Direct coating of copper nanoparticles on flexible substrates from copper precursors using underwater plasma and their EMI performance

The metal coated textiles and polymer films have become increasingly important in view of electromagnetic interference (EMI) shielding. In this study, we propose a simple underwater plasma system for direct coating of copper nanoparticles on textiles and polymer films to intercept electromagnetic wave. The proposed system can synthesize copper nanoparticles and coat it on substrate at once. We analyzed the characteristics of coating layer in order to optimize coating fabrication. When the copper nanoparticles were coated using optimized condition, the thickness of coating layer is about 1 μm and sheet resistance is about 95.44 mΩ/sq. The improved conductivity of polyimide film and nonwoven fabric significantly contributed to effective shielding of electromagnetic interference measured at 38.83 and 82.31 dB in frequency from 1 to 10 GHz.

Synthesis of ternary nanoparticles using the complexation-reduction method and their catalytic activities for hydrogen generation from formic acid

A complex-reduction method was used for the synthesis of glycine-capped copper nanoparticles (Gly-CuNPs). Glycine-Cu2+ was prepared at room temperature, and the resulting complex was treated with NaBH4. Gly-Cu/Ag and Gly-Cu/Ag/MnO2 were prepared by using the stepwise metal displacement plating method. Gly-Cu, Gly-Cu/Ag and Gly-Cu/Ag/MnO2 were employed as catalysts for hydrogen generation from the decomposition of formic acid. The alkaline barium hydroxide solution was employed to trap CO2 formation, and pseudo-first-order rate constants were calculated by using the kobs = 2.303/t log(Aα-A0/Aα-At) relation. Hydrogen generation followed fractional order kinetics with formic acid, and various kinetic parameters were calculated for various concentrations of promoter (sodium format), catalyst and temperature. The catalytic activity was found to increase with an increasing number of incorporated metals, and the order of reactivity was as follows: Gly-Cu/Ag/MnO2 > Gly-Cu/Ag > Gly-Cu. For Gly-Cu/Ag/MnO2, the values of activation parameters (Ea = 56 kJ/mol, ∆H# = 53 kJ/mol, ∆S# = − 68 J/K/mol) were determined with the Arrhenius and Eyring equations, which show higher catalytic efficiency than that of Gly-Cu/Ag (Ea = 69 kJ/mol, ∆H# = 66 kJ/mol, ∆S# = − 25 J/K/mol) due to the synergistic effect and strong interactions between the three metals. The catalytic stability and recyclability were excellent for five consecutive cycles, but the stability and recyclability decreased due to the higher reactivity of MnO2 NPs.

Copper nanoparticles: Green synthesis and managing fruit rot disease of chilli caused by Colletotrichum capsici.

The present study was focused on synthesis and characterization of copper nanoparticles to evaluate their efficacy against fruit rot pathogen of chilli crop. The green synthesis of nanoparticles was carried out by using extracts of Eucalyptus and Mint leaves. The synthesis of copper nanoparticles was confirmed by XRD, PSA, SEM and TEM. The average size of these particles synthesized by Eucalyptus leaf extract (CuNP-E) ranged from 10 to 130 nm, while as size of Mint leaf extract synthesized particles (CuNP-M) ranged from 23 to 39 nm, thus confirming their nano size. These green synthesized copper nanoparticles were evaluated against Colletotrichum capsici where Carbendazim 50 WP @ 500 ppm and copper oxychloride 50 WP @ 2500 ppm served as standard checks. The mycelia inhibition of Colletotrichum capsici caused by copper nanoparticles was studied on PDA medium. CuNP-M @ 1000 ppm showed highest mycelial inhibition of 99.78% followed by 93.75% at 500 ppm and CuNP-E @ 1000 ppm compared to standard fungicides, carbendazim 50 WP @ 500 ppm (72.82%), and copper oxychloride 50 WP @ 2500 ppm (85.85%). The CuNP-M @ 500 ppm were significantly superior to carbendazim 50 WP @ 500 ppm and copper oxychloride 50 WP @ 2500 ppm, but was statistically at par with CuNP-E @ 1000 ppm. This shows effectiveness of much lower concentration of copper nanoparticles compared to conventional fungicides. In detached fruit method, nanoparticles applied before inoculation of pathogen showed better results with regard to incubation period, lesion number and lesion size than after inoculation of pathogen. The present study reveals a simple, convenient, non-toxic and cost-efficient technique for the synthesis of nanoparticles and their effectiveness against Colletotrichum capsici. CuNP-M first time synthesized and evaluated against Colletotrichum capsici performed better than CuNP-E.

Copper Nanoparticles: A Review on Synthesis, Characterization and Applications

An emerging field of science “Nanotechnology” which is involved in manipulation of atoms and molecules has shown great potential in all fields of sciences. Nanotechnology deals with nanoparticles ranging from size 1 to 100 nm in diameter, due to small size and high surface area eventually increases the state of activity. This review focuses on metal and metal oxide nanoparticles and mainly on green synthesis, characterization and application of copper nanoparticles. Green synthesis of copper and copper oxide (Cu and CuO) is economically beneficial and ecofriendly. Copper nanoparticles are used in diverse fields such as biomedicine, pharmaceuticals, bioremediation, molecular biology, bioengineering, genetic engineering, dye degradation, catalysis, cosmetics and textiles. Structural properties and biological effects of copper nanoparticles have promising effectivity in field of life sciences.

Polyester fabric modification through fabrication of nano-copper compounds

This research introduces a new method of polyester fabric surface modification in order to achieve distinctive features. The copper sulfate, sodium hydroxide and cetyl trimethylammonium bromide (CTAB) were used to synthesize copper nanoparticles, and loaded on the polyester fabric surface. The optimal sample was considered by SEM-EDX, FT-IR and XRD devices. SEM images showed copper nanoparticles in shape of nano-plates with 150 to 600 nm in length and thickness of about 30 nm. The best results obtained on the modified fabric processed at boil for 120 min. According to the results of experiments CuO and Cu0 were synthesized on the fabric.

Synthesis of citrate-capped copper nanoparticles: A low temperature sintering approach for the fabrication of oxidation stable flexible conductive film

Printable flexible electronics are gaining attention day by day over the last few years due to the increasing demand for wearable electronics. Copper-based conductive inks are the most promising material for printing flexible electronics due to their high conductivity and cost-effectiveness. However, high-temperature sintering under reductive environment, rapid oxidation in the air and poor bending stability are the big constrains in the widespread utilization of copper inks. Herein we describe a facile method for fabrication of flexible conductive PET film under ambient air using as-synthesized citrate-capped copper nanoparticles. Sodium alginate paste (made in hydrazine) was used as a sintering aid to make the film conductive at low heating temperature. The citric acid capping protects the particles from oxidation while esterification with sodium alginate contribute to mechanical stability. The achieved resistivity of 74.4 ± 9 × 10−2 μΩ m is way better than reported in literature considering ambient air sintering under 60 ○C with improved adhesion, to the best of our knowledge. Persistent current flow even after 2500 bending cycles (not reported before) shows the exceptional mechanical stability of our film against bending, while the utilization of facial screen-printing fabrication technology made the process commercially viable and cost-effective.

Facile microwave-mediated green synthesis of non-toxic copper nanoparticles using Citrus sinensis aqueous fruit extract and their antibacterial potentials

This study focuses on the utilization of orange (Citrus sinensis) fruit extract for microwave mediated green synthesis of copper nanoparticles for the first time. After completion of the synthesis cycles, the presence of a maximum peak at the wavelength of 560 nm by UV–vis spectroscopy indicated the formation of CuNPs. FTIR spectrum identified the functional biomolecules of the orange juice extract, responsible for the bioreduction, stabilization of copper nanoparticles. Scanning Electron Microscopy (SEM) indicated the presence of globular shaped nano-sized copper particles with smooth surfaces whereas Energy Dispersive X-ray Spectrometry (EDX) confirmed the presence of copper, carbon and oxygen atoms with the amount of 77.68%, 17.55% and 4.77%, respectively. Transmission Electron Microscopy (TEM) illustrated that the CuNPs are morphologically round in shape with the distribution range of 6.93 nm–20.70 nm in diameter. X-ray diffraction (XRD) analysis revealed the presence of face-centered cubic crystalline structures of copper nanoparticle, and Zeta potential analysis confirmed their high stability by showing the strong negative potential value (−25.60 mV). Moreover, these biosynthesized copper nanoparticles displayed their efficiency in controlling the growth of the bacteria, i.e., Escherichia coli and Staphylococcus aureus. The results revealed their non-cytotoxic nature on the L929 mouse fibroblast cell line through XTT cell viability assay. All these studies indicated that CuNPs synthesized by orange extract have the potential to serve as a green nanomaterial for biomedical applications.