SYNTHESIS OF GOLD NANOPARTICLES VIA CHEMICAL REDUCTION METHODS …
SYNTHESIS OF GOLD NANOPARTICLES VIA CHEMICAL REDUCTION ..
EU SYNTHESIS OF GOLD NANOPARTICLES VIA CHEMICAL REDUCTION METHODS ..
Plant in Nanoparticles Synthesis: Plants offer a better option for synthesis of nanoparticle as the protocols involving plant sources are free from toxic chemicals; moreover, natural capping agents are readily supplied by the plants. Sastry et al., reported the synthesis of gold and silver nanoparticles using geranium extracts 21. Further, gold nanotriangles and silver nanoparticles were synthesized using Aloe Vera plant extracts 22. Most reports available on the synthesis of silver or gold nanoparticles use broths resulting from boiling fresh plant leaves.
However, Huang et al., synthesized silver and gold nanoparticles using the sundried Cinnamomum camphora leaf extract 23. A simple green synthesis method for production of well-defined silver nanowires was reported recently by Lin et al24. The method involves reduction of silver nitrate with the broth of sundried Cassia fistula leaf at room temperature without using any additive. Various plants/plant tissues, nanoparticles synthesized using them, their shape and size and the references are listed in Table 1.
A chemical reduction approach to the synthesis of ..
Silver nanoparticles (NPs) have been the subjects of researchers because of their unique properties (e.g., size and shape depending optical, antimicrobial, and electrical properties). A variety of preparation techniques have been reported for the synthesis of silver NPs; notable examples include, laser ablation, gamma irradiation, electron irradiation, chemical reduction, photochemical methods, microwave processing, and biological synthetic methods. This review presents an overview of silver nanoparticle preparation by physical, chemical, and biological synthesis. The aim of this review article is, therefore, to reflect on the current state and future prospects, especially the potentials and limitations of the above mentioned techniques for industries.
In summary, we presented a new biocompatible synthesis method of gold nanoparticles by Tris, a widely used buffer of nucleic acids and proteins. The method has a useful feature to allow modifying the DNA during the process of preparation of gold nanoparticles. However, the mechanism responsible for biomolecule-directed gold nanoparticle formation remains unclear due to the lack of structural information about biological systems and the fast kinetics of biomimetic chemical systems in solution .
Photochemical synthesis of colloidal gold nanoparticles …
Gold nanoparticles' novel properties are widely realized in catalysis, plasmonics, electronics, and biomedical applications. For biomedical application, one challenge is to find a non-toxic chemical and/or physical method of functionalizing gold nanoparticles with biomolecular compounds that can promote efficient binding, clearance, and biocompatibility and to assess their safety to other biological systems and their long-term effects on human health and reproduction. In the present study, we describe a new method by using Tris(hydroxymethyl)aminomethane (Tris), a widely used buffer solvent of nucleic acid and proteins, as the reducing agent for synthesizing gold nanoparticles by one step. It is found that Tris carries out the reduction reactions in relatively mild conditions for biomacromolecules. Particularly, it can be used to modify the DNA during the process of preparation of gold nanoparticles. The morphology and size distribution of gold nanoparticles are consistent and were confirmed by many different approaches including dynamic light scattering (DLS), UV-visible (UV-vis) spectrophotometry, atomic force microscopy (AFM), and transmission electron microscopy (TEM).
DNA-mediated gold nanoparticles were synthesized by the chemical reduction of DNA-Au(III) complexes using hydrazine () and sodium borohydride () as reducing agents.
Photochemical synthesis of colloidal gold nanoparticles
General method of synthesis for metal nanoparticles | …
The method is applied to study the classical GNP synthesis route via the reduction of ..
General method of synthesis for metal nanoparticles
Mechanism of Gold Nanoparticle Formation in the Classical Citrate Synthesis Method ..
Journal of Nanomaterials will highlight ..
A chemical reduction approach to the synthesis of copper nanoparticles …
Synthesis of Cu Nps by a Chemical Reduction Method
Chapter 3-2: Synthesis of metal nanoparticles and films. • Chemical reduction method: (synthesis of Au and bi-metallic nanoparticles). • Electrochemical …
A Facile pH Controlled Citrate-Based Reduction Method …
Highly monodisperse sodium citrate-coated spherical silver nanoparticles (Ag NPs) with controlled sizes ranging from 10 to 200 nm have been synthesized by following a kinetically controlled seeded-growth approach via the reduction of silver nitrate by the combination of two chemical reducing agents: sodium citrate and tannic acid. The use of traces of tannic acid is fundamental in the synthesis of silver seeds, with an unprecedented (nanometric resolution) narrow size distribution that becomes even narrower, by size focusing, during the growth process. The homogeneous growth of Ag seeds is kinetically controlled by adjusting reaction parameters: concentrations of reducing agents, temperature, silver precursor to seed ratio, and pH. This method produces long-term stable aqueous colloidal dispersions of Ag NPs with narrow size distributions, relatively high concentrations (up to 6 × 1012 NPs/mL), and, more important, readily accessible surfaces. This was proved by studying the catalytic properties of as-synthesized Ag NPs using the reduction of Rhodamine B (RhB) by sodium borohydride as a model reaction system. As a result, we show the ability of citrate-stabilized Ag NPs to act as very efficient catalysts for the degradation of RhB while the coating with a polyvinylpyrrolidone (PVP) layer dramatically decreased the reaction rate.
The synthesis of gold nanoparticles using citrate reduction ..
We report the first discovery of pure face-centered-cubic (fcc) Ru nanoparticles. Although the fcc structure does not exist in the bulk Ru phase diagram, fcc Ru was obtained at room temperature because of the nanosize effect. We succeeded in separately synthesizing uniformly sized nanoparticles of both fcc and hcp Ru having diameters of 2–5.5 nm by simple chemical reduction methods with different metal precursors. The prepared fcc and hcp nanoparticles were both supported on γ-Al2O3, and their catalytic activities in CO oxidation were investigated and found to depend on their structure and size.
Facile synthesis of concentrated gold nanoparticles …
Although gold nanoparticles (GNP) are among the most intensely studied nanoscale materials, the actual mechanisms of GNP formation often remain unclear due to limited accessibility to in situ-derived time-resolved information about precursor conversion and particle size distribution. Overcoming such limitations, a method is presented that analyzes the formation of nanoparticles via in situ SAXS and XANES using synchrotron radiation. The method is applied to study the classical GNP synthesis route via the reduction of tetrachloroauric acid by trisodium citrate at different temperatures and reactant concentrations. A mechanism of nanoparticle formation is proposed comprising different steps of particle growth via both coalescence of nuclei and further monomer attachment. The coalescence behavior of small nuclei was identified as one essential factor in obtaining a narrow size distribution of formed particles.
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