Swarnima Rawat; Nilanjal Misra; Virendra Kumar; Shubhangi Atmaram Shelkar; Narender Kumar Goel; Rakesh Kumar Singhal; Lalit Varshney
Abstract
A robust and reusable Copper Nanoparticles Immobilised Catalytic Reactor (Cu-NICaR) system was fabricated by immobilising Copper Nanoparticles (Cu NPs) onto a radiation functionalized polymer support. Gamma radiation induced simultaneous irradiation grafting process was employed for introducing poly-glycidyl ...
Read More
A robust and reusable Copper Nanoparticles Immobilised Catalytic Reactor (Cu-NICaR) system was fabricated by immobilising Copper Nanoparticles (Cu NPs) onto a radiation functionalized polymer support. Gamma radiation induced simultaneous irradiation grafting process was employed for introducing poly-glycidyl methacrylate (poly(GMA)) chains onto non woven PE-PP matrix. Optimization of the grafting process was carried out by studying the effect of experimental parameters, such as absorbed dose, monomer concentration and solvent polarity on grafting yield. The poly(GMA)-g-PE-PP matrix was used as a functional polymer support for Cu NPs, synthesised under optimized conditions using NaBH4 as reducing agent. Characterization of the samples was carried out by UV-Visible spectrophotometer, Fourier Transform Infrared (FTIR) Spectroscopy, X-ray fluorescence (XRF), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM). Catalytic activity of Cu NPs immobilised poly(GMA)-g-PE-PP catalytic system was studied by spectrophotometrically monitoring the catalytic reduction of p-nitrophenol (PNP), using NaBH4 as reducing agent. The Cu NPs-immobilised-poly(GMA)-g-PE-PP was observed to exhibit excellent catalytic activity both in batch process (12 cycles over a period of 30 days) as well as in fixed bed column reactor mode, without significant loss of activity.
B. Parvathy Devi; Sandeep K Das; Yian Tai
Abstract
This study examines the effect of cheap and easy to synthesize copper nanoparticles (CuNPs) for its surface plasmon resonance behavior on the performance of organic solar cells (OSC). A simple synthesis of stable CuNPs is reported together with a procedure for their optimized incorporation in the OSC ...
Read More
This study examines the effect of cheap and easy to synthesize copper nanoparticles (CuNPs) for its surface plasmon resonance behavior on the performance of organic solar cells (OSC). A simple synthesis of stable CuNPs is reported together with a procedure for their optimized incorporation in the OSC architecture via dispersing them on ZnO interfacial layer. The CuNPs triggers the localized surface plasmon resonance resulting in enhancement of short circuit current density under AM1.5 illumination.
Kalawati Saini; Rajaya Shree Pandey
Abstract
Quantum dot of copper (Cu) and nanoparticles of copper and copper oxide (Cu2O, 6CuOCu2O, Cu3O4) were synthesized by electrochemical route using the tri-sodium citrate (TSC) and ascorbic acid as a capping and reducing agent. The synthesis was done at 3.2 V, 311 K and 15 V, 373 K using copper rod as a ...
Read More
Quantum dot of copper (Cu) and nanoparticles of copper and copper oxide (Cu2O, 6CuOCu2O, Cu3O4) were synthesized by electrochemical route using the tri-sodium citrate (TSC) and ascorbic acid as a capping and reducing agent. The synthesis was done at 3.2 V, 311 K and 15 V, 373 K using copper rod as a working electrode and platinum wire as a reference electrode. The electrochemical set up was kept under inert nitrogen-purged conditions. Cu nanoparticles were synthesized in large-scale for the first time by direct dissolution of Cu 2+ into the solution of capping agent from copper electrode in the electrochemical cell. Nanoparticles were characterized by using UV–visible absorption spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. High resolution TEM pictures showed the formation of different shapes of nanostructures such as spherical, dendrites and leaf-shape respectively. The copper nanoparticles in presence of 200 mM of ascorbic acid were obtained with sizes of 2.10 - 4.81 nm in spherical shape and 24.5 - 49.4 nm with 2.88 mM of ascorbic acid. At lower concentration, the particles were also obtained in leaf-shape with ascorbic acid. The leaf shape was also obtained with 250 mM of TSC. This new kind of synthesis method shows the excellent stability compared with that of another chemical method of copper nanoparticles. These particles were used for degradation of methyl orange. The kinetic study of methyl orange with leaf shape particle capping via TSC shows complete degradation of methyl orange in 120 min.
Prahlad K. Baruah; Anuma Singh; Iffat Jahan; Latha Rangan; Aditya N. Panda; Ashwini K. Sharma; Alika Khare
Abstract
The effect of concentration of copper (Cu) nanoparticles (NPs) on surface enhanced Raman scattering (SERS) in furanoflavonoid karanjin is reported in this paper. Cu NPs were synthesized by pulsed laser ablation of Cu target immersed in distilled water (DW). The absorption spectrum of colloidal solution ...
Read More
The effect of concentration of copper (Cu) nanoparticles (NPs) on surface enhanced Raman scattering (SERS) in furanoflavonoid karanjin is reported in this paper. Cu NPs were synthesized by pulsed laser ablation of Cu target immersed in distilled water (DW). The absorption spectrum of colloidal solution of Cu NPs displayed a broad peak around ~625 nm corresponding to the surface plasmon resonance (SPR) oscillations. Transmission electron microscope (TEM) images confirmed the formation of nearly spherical Cu NPs having average size of ~12-13 nm. The solution of furanoflavonoid karanjin dissolved in dimethyl sulphoxide (DMSO) was treated with the synthesized NPs and subjected to micro-Raman spectrophotometer for the SERS studies as a function of concentration of Cu NPs. Raman signal of Cu NP treated karanjin was observed to be ten times more as compared to that of untreated one for the most intense C=O stretching band of flavone ring. This corresponds to an enhancement factor of the order of 10 2 and was observed at the optimum concentration of ~0.08 mg/mL of Cu NPs.
Razium Ali Soomro; Syed Tufail Hussain Sherazi; Najma Memon; Mohammad Raza Shah; Nazar Hussain Kalwar; Keith Richard Hallam; Afzal Shah
Abstract
The undertaken study describes synthesis of air resistant copper nanoparticles (Cu NPs) in an aqueous phase using sodium borohydride as a reducing agent via chemical reduction method. The hydrosol has resistant to oxidation by atmospheric oxygen for several days. The air stability was induced by capping ...
Read More
The undertaken study describes synthesis of air resistant copper nanoparticles (Cu NPs) in an aqueous phase using sodium borohydride as a reducing agent via chemical reduction method. The hydrosol has resistant to oxidation by atmospheric oxygen for several days. The air stability was induced by capping Cu NPs with anionic surfactant “sodium dodecyl sulfate (SDS)”. Ascorbic acid was used as an antioxidant. These Cu NPs were characterized by ultraviolet-visible (UV-VIS) spectroscopy, which contributed towards the understanding of surface plasmon resonance (SPR) generation and optical behavior of Cu NPs. It was used as an optical tracer for size control and confirmation of Cu NPs and was found to be affected by various parameters like reaction time, pH, concentration of copper sulfate and the surfactant SDS. SPR peaks were found to shift from 597 to 569 nm, while apparent color changes from yellow to brick red. Further characterization studies were carried out by using fourier transform infrared (FT-IR) spectroscopy to investigate the co-ordination between Cu NPs and SDS. X-ray diffraction (XRD) was used for phase purity of Cu NPs. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) were used the size and morphological characterization. The average size of the Cu NPs was found to be 15 nm in diameter with an average height of 14 nm. The Cu NPs showed excellent catalytic activity in the reductive degradation of Eosin B (EB) dye in just 16 sec of reaction time and maintained their catalytic activity when reused multiple times. The degradation rate was found to follow first order reaction kinetics with the EB degradation. The Cu NPs enhanced the rate of EB degradation 30 times more than the control test. Copper was found an attractive catalyst in the nanosize regimes. The Cu NPs are more economical as compared to noble metals. The Cu NPs are expected to be suitable alternative and play an imperative role in the fields of catalysis and environmental remediation.
)