Characterization of Green Synthesized Copper Nanoparticles Stabilized by Ocimum Leaf Extract

2014 ◽  
Vol 1704 ◽  
Author(s):  
Sathiraju Annapurna ◽  
Yathapu Suresh ◽  
Bojja Sreedhar ◽  
Ganghishetti Bhikshamaiah ◽  
A.K. Singh
Keyword(s):  
Electron Microscopy ◽  
Copper Nanoparticles ◽  
Leaf Extract ◽  
Chemical Reduction ◽  
Ocimum Sanctum ◽  
X Ray Diffraction ◽  
Copper Salts ◽  
Visible Absorption ◽  
X Ray ◽  
Average Size

ABSTRACTCopper nanoparticles are synthesized successfully through chemical reduction of different copper salts stabilized by Ocimum Sanctum Leaf extract, a natural biopolymer. The resulting copper nanoparticles are characterized by using UV Visible Absorption Spectrometer, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS) and Fourier Transform Infrared Spectroscopy (FTIR) experiments. Copper nanoparticles prepared display an absorption peak at around 558 nm. X-ray diffraction analysis shows that the particles are FCC crystalline. SEM and TEM display the formation of copper nanoparticles with an average size of 10 nm. The SAXS studies demonstrate the formation of spherical nanoparticles with bimodal size distribution. The FTIR spectrum analysis has confirmed the presence of functional groups of stabilizer Ocimum Sanctum leaf extract in capping the copper nanoparticles.

Receiving Copper Nanoparticles: Experiment and Modelling

2019 ◽  
Vol 288 ◽  
pp. 140-147 ◽  
Author(s):  
Andrey V. Nomoev ◽  
Erzhena C. Khartaeva ◽  
Natalia V. Yumozhapova ◽  
Tumen G. Darmaev ◽  
S.P. Bardakhanov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Copper Nanoparticles ◽  
Pure Copper ◽  
Current Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Embedded Atom ◽  
Transmission Electron ◽  
Average Size

The copper nanoparticles were obtained by evaporating the metal by the relativistic electron beam. The average size of synthesized particles was about 120 nm. They were characterized by X-ray diffraction, transmission electron microscopy. The results of the X-ray diffraction showed high content of the pure copper for closed setup with an inert gas. Transmission electron microscopy cleared some particles to have an icosahedral structure. These nanoparticles were obtained when the target was exposed by the beam with the highest current strength used in the experiment and the highest cooling of the copper vapor. The process of copper nanoparticle formation by the molecular dynamic method using EAM – potentials (potentials in the Embedded Atom Method form) was studied.

scholarly journals Green Synthesis of Polymer-Capped Copper Nanoparticles Using Ocimum sanctum Leaf Extract: Antibacterial and Antioxidant Potential

2021 ◽  
Vol 14 (4) ◽  
pp. 1831-1838
Author(s):  
Chirag Makvana
Keyword(s):  
Copper Nanoparticles ◽  
Leaf Extract ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Ocimum Sanctum ◽  
Scavenging Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible

The advancement of green nanotechnology has piqued the interest of researchers into the environmentally responsible production of nanoparticles. Conventionally used chemical methods for the synthesis of the nanoparticles have shown adverse effect on environment due to the use of highly toxic chemicals. They are also expensive as they utilize costly chemicals as a reducing and capping agent. Use of plant extract can be an environment friendly and cost-effective approach for the synthesis of nanoparticles. Copper is the metal which humans utilize from the ancient time period and it doesn’t show any adverse effect on humankind as well as on environment. Leaf extract of Ocimum sanctum was employed with CuSO4 (1:9, v/v) to synthesize stable copper nanoparticles (CuNPs) that were then functionalized with Polyvinyl Pyrrolidone (PVP) polymer. Characterization of synthesized copper nanoparticles was carried out using UV–Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Synthesized CuNPs were subjected against the human pathogenic bacterial strain to evaluate their antibacterial potency. Antioxidative characteristics of CuNPs were analyzed using DPPH free radical scavenging activity. The UV–visible spectra of CuNPs showed unique peaks at 322 and 247 nm indicates the stable formation of nanoparticles. X-ray diffraction pattern suggest the face cubic centered (FCC) structure of copper nanoparticles. FTIR analysis revealed the presence of biomolecules attached on the surface of CuNPs. TEM analysis proven the synthesis of spherical shaped CuNPs with the average particle size of 73.50 ± 1.78 nm. Biosynthesized CuNPs showed maximum zone of inhibition against E. coli which was tends to be 20 mm. 51.48 % of DPPH free radical scavenging activity was observed by synthesized PVP coated CuNPs. As a result, this technology can be employed for the quick and environmentally friendly biosynthesis of stable copper nanoparticles with antibacterial and antioxidant activities with the size range from 10 to 100 nm, implying their potential application in the healthcare, clinical as well as pharmaceutical fields

scholarly journals Green Synthesis of Silver Nanoparticles using Strobilanthes flaccidifolius Nees. Leaf Extract and its Antibacterial Activity

2016 ◽  
Vol 8 (1) ◽  
pp. 1523-1532 ◽  
Author(s):  
Sujata D Wangkheirakpam ◽  
Wangkheirakpam Radhapiyari Devi ◽  
Chingakham Brajakishore Singh ◽  
Warjeet S Laitonjam
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Electron Paramagnetic Resonance Technique ◽  
Average Size ◽  
Green Technique

The leaf extract of Strobilanthes flaccidifolius Nees. was used for the synthesis of silver nanoparticles through a green technique of synthesis. The nanoparticles was characterized by UV-VIS spectroscopy which proves the formation silver nanoparticles. FTIR (Fourier Transmission infra red spectroscopy) study was carried out to assess the biomolecule as indigo precursors, Energy dispersion X-ray analysis(EDX) data further proves it. EPR (Electron paramagnetic resonance technique) shows the free radical in silver neutral state and XRD(X-ray diffraction technique) also repots silver neutral formation.The morphology and the shape of the silver nanoparticles were determined by Scanning electron microscopy(SEM) and Tunneling electron microscopy (TEM).The nanoparticles adopted spherical morphology and the size ranging from 6nm to 54.11nm and average size was determined as 12.15± 5.3nm.The nanoparticles had antimicrobial activity

scholarly journals Formation of ZnO/Zn0.5Cd0.5Se Alloy Quantum Dots in the Presence of High Oleylamine Contents

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 999
Author(s):  
Yi-An Chen ◽  
Kuo-Hsien Chou ◽  
Yi-Yang Kuo ◽  
Cheng-Ye Wu ◽  
Po-Wen Hsiao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Particle Size ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Alloy Quantum Dots ◽  
First Time

To the best of our knowledge, this report presents, for the first time, the schematic of the possible chemical reaction for a one-pot synthesis of Zn0.5Cd0.5Se alloy quantum dots (QDs) in the presence of low/high oleylamine (OLA) contents. For high OLA contents, high-resolution transmission electron microscopy (HRTEM) results showed that the average size of Zn0.5Cd0.5Se increases significantly from 4 to 9 nm with an increasing OLA content from 4 to 10 mL. First, [Zn(OAc)2]–OLA complex can be formed by a reaction between Zn(OAc)2 and OLA. Then, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) data confirmed that ZnO is formed by thermal decomposition of the [Zn(OAc)2]–OLA complex. The results indicated that ZnO grew on the Zn0.5Cd0.5Se surface, thus increasing the particle size. For low OLA contents, HRTEM images were used to estimate the average sizes of the Zn0.5Cd0.5Se alloy QDs, which were approximately 8, 6, and 4 nm with OLA loadings of 0, 2, and 4 mL, respectively. We found that Zn(OAc)2 and OLA could form a [Zn(OAc)2]–OLA complex, which inhibited the growth of the Zn0.5Cd0.5Se alloy QDs, due to the decreasing reaction between Zn(oleic acid)2 and Se2−, which led to a decrease in particle size.

Facile synthesis of water-soluble graphene-based composite: Non-covalently functionalized with chitosan-ionic liquid conjugation

2016 ◽  
Vol 09 (03) ◽  
pp. 1650045 ◽  
Author(s):  
Pei-Ying Li ◽  
Kai-Yu Cheng ◽  
Xiu-Cheng Zheng ◽  
Pu Liu ◽  
Xiu-Juan Xu
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Chemical Reduction ◽  
Water Soluble ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Text Interaction

Chitosan-ionic liquid conjugation (CILC), which was prepared through the reaction of 1-(4-bromobutyl)-3-methylimidazolium bromide (BBMIB) with chitosan, was firstly used to prepare functionalized graphene composite via the chemical reduction of graphene oxide (GO). The obtained water soluble graphene-based composite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), ultraviolet-visible (UV–Vis) spectroscopy and so on. CILC-RGO showed excellent dispersion stability in water at the concentration of 2.0 mg/mL, which was stable for several months without any precipitate. This may be ascribed to the electrostatic attraction and [Formula: see text]–[Formula: see text] interaction between CILC and graphene.

Mixed-Solvothermal Preparation of Mace-Like CdS Nanocrystals

2012 ◽  
Vol 502 ◽  
pp. 164-168
Author(s):  
Ling Xu ◽  
Han Mei Hu ◽  
Hai Yan Xu
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Volume Ratio ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Cds Nanostructures ◽  
Uv Visible ◽  
Solvothermal Preparation

Novel mace-like (wolf-teeth clubs) CdS nanostructures were successfully prepared on a large scale using CdCl2•2.5H2O and NH2CSNH2 as starting materials through a convenient mixed-solvothermal route. The as-synthesized products were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDX), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy. The experimental results reveal that the morphology of CdS products was greatly affected by the volume ratio of anhydrous ethanol and distilled water. The possible mechanism for the formation of mace-like CdS nanostructures is simply discussed.

scholarly journals Biosintesis Nanopartikel Perak menggunakan Ekstrak Daun Ketapang, Modifikasi dengan Asam p-kumarat untuk Aplikasi Deteksi Melamin

2017 ◽  
Vol 4 (2) ◽  
pp. 367-372
Author(s):  
Andi Rusnaenah ◽  
Muhammad Zakir ◽  
Prastawa Budi
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Leaf Extract ◽  
Reduction Method ◽  
Coumaric Acid ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Unit Cells ◽  
Visible Absorption Spectroscopy

Biosynthesis of silver nanoparticles (AgNPs) using ketapang leaf extract, modification with p-coumaric acid for detecting melamine has conducted. This research aimed to synthesize AgNPs via bio-reduction method using ketapang leaf extract followed by modification with p-coumaric acid (APK), and evaluating its application detecting melamine. The AgNPs were characterized through ultraviolet-visible absorption spectroscopy (UV-Vis) and X-ray diffraction (XRD). Observation suggested that an increase of incubation time had affected its surface Plasmon resonance trend. Further analysis of crystallite via XRD suggested that nanoparticle size at 43 nm estimated using Debye-Scherer, within the form of unit cells is cubic. The performance of product as melamine detector suggested that the AgNPs-APK had detected melamine in range of concentration from 0.1 to 1000 ppm.

scholarly journals Phytofabrication of Silver/Silver Chloride Nanoparticles Using Aqueous Leaf Extract of Oedera genistifolia: Characterization and Antibacterial Potential

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4382 ◽  
Author(s):  
Kunle Okaiyeto ◽  
Mike O. Ojemaye ◽  
Heinrich Hoppe ◽  
Leonard V. Mabinya ◽  
Anthony I. Okoh
Keyword(s):  
Electron Microscopy ◽  
Cytotoxic Effect ◽  
Leaf Extract ◽  
Silver Chloride ◽  
Xrd Analysis ◽  
Reducing Agent ◽  
X Ray ◽  
Aqueous Leaf Extract ◽  
Average Size ◽  
Silver Silver

In this present study, silver nanoparticles (Ag/AgCl NPs) were synthesized using an aqueous leaf extract of Oedera genistifolia as a reducing agent. The biosynthesized Ag/AgCl NPs was characterized by UV-visible spectrophotometry, transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). In addition, sequel to antibacterial assay, the cytotoxic effect of the phytofabricated Ag/AgCl NPs was assessed against the HeLa cell line (human cervix adenocarcinoma). The results of the characterization of the synthesized Ag/AgCl NPs indicate the successful synthesis using plant extract as a reducing agent, with UV-Vis spectra between 290–360 nm. TEM results showed that Ag/AgCl NPs was spherical in shape with an average size of 34.2 nm. EDX analysis revealed that the particles were predominantly composed of carbon, oxygen, chlorine, and silver, while FTIR identified major phytochemical compounds, which could be responsible for bio-reducing and capping potential. XRD analysis showed the crystallinity of Ag/AgCl NPs, with a face-centred cubic structure. The studied Ag/AgCl NPs had no cytotoxic effect on HeLa cells and exhibited antibacterial activity (minimum inhibitory concentration (MIC) 0.25–1 mg/mL; minimum bactericidal concentration (MBC) 2–16 mg/mL) against both the Gram-negative and Gram-positive bacteria investigated. Findings from this study suggest that this plant as a good candidate for producing new antibacterial drugs.

scholarly journals Synthesis of Flower-Like Cu2ZnSnS4Nanoflakes via a Microwave-Assisted Solvothermal Route

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Fei Long ◽  
Shuyi Mo ◽  
Yan Zeng ◽  
Shangsen Chi ◽  
Zhengguang Zou
Keyword(s):  
Electron Microscopy ◽  
Raman Scattering ◽  
Zinc Acetate Dihydrate ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Direct Band ◽  
Xrd Patterns ◽  
Average Size

Flower-like Cu2ZnSnS4(CZTS) nanoflakes were synthesized by a facile and fast one-pot solution reaction using copper(II) acetate monohydrate, zinc acetate dihydrate, tin(IV) chloride pentahydrate, and thiourea as starting materials. The as-synthesized samples were characterized by X-ray diffraction (XRD), Raman scattering analysis, field emission scanning electron microscopy (FESEM) equipped with an energy dispersion X-ray spectrometer (EDS), transmission electron microscopy (TEM), and UV-Vis absorption spectra. The XRD patterns shown that the as-synthesized particles were kesterite CZTS and Raman scattering analysis and EDS confirmed that kesterite CZTS was the only phase of product. The results of FESEM and TEM show that the as-synthesized particles were flower-like morphology with the average size of 1~2 μm which are composed of 50 nm thick nanoflakes. UV-Vis absorption spectrum revealed CZTS nanoflakes with a direct band gap of 1.52 eV.

Combustion Synthesis of V(CN) Powders

2012 ◽  
Vol 452-453 ◽  
pp. 278-281
Author(s):  
Yun Сhao Mu ◽  
Bao Yan Liang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Combustion Synthesis ◽  
Titanium Carbonitride ◽  
Scanning Electron Microscopy Image ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microscopy Image ◽  
Average Size ◽  
Scanning Electron

Titanium carbonitride, V(C, N) has been prepared by combustion synthesis from V powders and a carbon-nitrogen precursor. The phase composition of the sample was investigated by X-ray diffraction. The scanning electron microscopy image indicates that the average size of the obtained V(C, N) grains was 1µm.

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