Chemical reduction of Ag+ to Ag employing organic electron donors: evaluation of the effect of Ag+-mediated cytosine–cytosine base pairing on the aggregation of Ag nanoparticles

2021 ◽  
Author(s):  
Takenori Dairaku ◽  
Rika Kawai ◽  
Kanako Nozawa-Kumada ◽  
Kentaro Yoshida ◽  
Tetsuya Ono ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Total Concentration ◽  
Electron Donors ◽  
Base Pairing ◽  
Reduction Activity ◽  
Organic Electron

The formation of C–Ag+–C base pairing inhibits the aggregation of AgNPs in solution. The total concentration of the obtained AgNP solution can be controlled by the degree of the reduction activity of the organic electron donors.

Switching from single to simultaneous free radical and anionic polymerization with enamine‐based organic electron donors

2021 ◽  
Author(s):  
Yuxi Zhao ◽  
Marion Rollet ◽  
Laurence Charles ◽  
Gabriel Canard ◽  
Didier Gigmes ◽  
...  
Keyword(s):  
Free Radical ◽  
Anionic Polymerization ◽  
Electron Donors ◽  
Organic Electron

Aggregation Characteristics of Cu and Ag Nanoparticles in Presence of Starch as the Polymer Stabilizer

2010 ◽  
Vol 123-125 ◽  
pp. 615-618 ◽  
Author(s):  
Indrajit Sinha ◽  
Manjeet Singh ◽  
Rajiv Kumar Mandal
Keyword(s):  
Small Molecule ◽  
Ag Nanoparticles ◽  
Growth Models ◽  
Chemical Reduction ◽  
Cluster Aggregation ◽  
Diffusion Limited ◽  
X Ray Scattering ◽  
Polymer Stabilizer ◽  
Aqueous Conditions ◽  
Diffusion Limited Cluster Aggregation

This presentation deals with the aggregation characteristics of Cu and Ag nanoparticles in presence of starch as the polymer stabilizer. Uncontrolled aggregation of the destabilized nanoparticles offers problem for applications based on surface plasmon activity. Polymer or small molecule surfactants are used to control nature of aggregation of nanoparticles produced by chemical reduction synthesis routes. Different growth models such as diffusion limited cluster aggregation (DLCA), reaction limited cluster aggregation (RLCA) proposed to explain the formation of fractal colloidal aggregates do not account for aggregate formation in presence of polymer or small molecule surfactants. We shall be discussing the role of starch on the aggregation characteristics of copper and silver nanoparticles formed by chemical reduction in aqueous conditions. The effect of NaOH concentration and consequently the pH on such aggregation kinetics during such synthesis is delineated. We use small angle x-ray scattering (SAXS) to quantitatively understand different aspects of aggregation behavior.

Facile Synthesis of Silver Nanoparticles by Chemical Reduction Route

2013 ◽  
Vol 756 ◽  
pp. 99-105
Author(s):  
Rajasingam Ratnamalar ◽  
Mustapha Mariatti ◽  
Zulkifli Ahmad ◽  
Sharif Zein Sharif Hussein
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Facile Synthesis ◽  
Cubic Lattice ◽  
Vis Spectroscopy ◽  
Simple Chemical ◽  
The Face ◽  
Fine Control ◽  
Xrd Patterns

This work reports a simple chemical reduction route for the preparation of uniformed Ag nanoparticles whereby a fine control over the sizes of the Ag nanoparticles was studied by varying the concentrations of the reducing agents used. In characterization, UV-Vis spectroscopy showed the changes in optical properties of the Ag nanoparticles with regards to their sizes, where as the XRD patterns of the synthesized Ag nanoparticles confirmed the distinct peaks approximately at 2θ = 38.1°, 44.3°, 64.4°, 77.4°, and 81.5 representing Bragg’s reflections from (111), (200), (220), (311), and (222) planes of the face centred cubic lattice phase. This route of synthesis is feasible to produce Ag nanoparticles with diameters in the range of 30-45 nm.

Growth of Ag Nanoparticles by Spin Coating

2013 ◽  
Vol 24 ◽  
pp. 163-167 ◽  
Author(s):  
S.D. Sartale ◽  
A.A. Ansari
Keyword(s):  
Ag Nanoparticles ◽  
Spin Coating ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Environment Effects ◽  
Uv Visible ◽  
Absorbance Spectra ◽  
Scanning Electron ◽  
Better Than

Ag nanoparticles were grown on glass substrate by spin coating of Ag ions (AgNO3) solution followed by either chemical reduction, in aqueous hydrazine or NaBH4 solution, or by thermal reduction in H2 environment. Effects of different reducing agent have been explained. Morphology and absorbance spectra ofAg nanoparticles films, measured by using Scanning Electron Microscopy (SEM) and UV-visible Spectrophotometer techniques, are used to understand effect of reduction process on growth of Ag nanoparticles. To grow uniformly size distributed Ag nanoparticles thermal reduction in H2 is better than chemical reduction by aqueous either NaBH4 orhydrazine hydrate solutions.

scholarly journals Base-Free Generation of Organic Electron Donors from Air-Stable Precursors

2018 ◽  
Vol 57 (12) ◽  
pp. 3148-3153 ◽  
Author(s):  
Guillaume Tintori ◽  
Pierre Nabokoff ◽  
Ruqaya Buhaibeh ◽  
David Bergé-Lefranc ◽  
Sébastien Redon ◽  
...  
Keyword(s):  
Electron Donors ◽  
Organic Electron ◽  
Free Generation

scholarly journals Organic Molecule Detection Based on SERS in Microfluidics

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Xin Zhang ◽  
Haiyan Zhang ◽  
Sheng Yan ◽  
Zugang Zeng ◽  
Anshou Huang ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Ag Nanoparticles ◽  
Organic Molecule ◽  
Organic Molecules ◽  
Chemical Reduction ◽  
Fdtd Method ◽  
Great Influence ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate

AbstractSensitive in situ detection of organic molecules is highly demanded in environmental monitoring. In this work, the surface enhanced Raman spectroscopy (SERS) is adopted in microfluidics to detect the organic molecules with high accuracy and high sensitivity. Here the SERS substrate in microchannel consists of Ag nanoparticles synthesized by chemical reduction. The data indicates the fabrication conditions have great influence on the sizes and distributions of Ag nanoparticles, which play an important role on the SERS enhancement. This result is further confirmed by the simulation of electromagnetic field distributions based on finite difference time domain (FDTD) method. Furthermore, the SERS spectra of organic molecule (methylene blue) obtained in this plasmonic microfluidic system exhibit good reproducibility with high sensitivity. By a combination of SERS and microfluidics, our work not only explores the research field of plasmonics but also has broad application prospects in environmental monitoring.

scholarly journals 1,2,4,5‐Tetrakis(tetramethylguanidino)‐3,6‐diethynyl‐benzenes: Fluorescent Probes, Redox‐Active Ligands and Strong Organic Electron Donors

2020 ◽  
Vol 26 (45) ◽  
pp. 10336-10347
Author(s):  
Conrad Wagner ◽  
Franka Kreis ◽  
Dennis Popp ◽  
Olaf Hübner ◽  
Elisabeth Kaifer ◽  
...  
Keyword(s):  
Fluorescent Probes ◽  
Electron Donors ◽  
Redox Active Ligands ◽  
Redox Active ◽  
Organic Electron

Synthesis of Ag Nanoparticles-Clinoptilolite Composite by Homogeneous and Heterogeneous Nucleation

2013 ◽  
Vol 755 ◽  
pp. 97-103 ◽  
Author(s):  
A. Ruíz-Baltazar ◽  
R. Esparza ◽  
R. Pérez ◽  
G. Rosas
Keyword(s):  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Heterogeneous Nucleation ◽  
Ag Nanoparticles ◽  
Natural Zeolite ◽  
Colloidal Solution ◽  
Chemical Reduction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

In this study, a natural zeolite clinoptilolite-type was impregnated through homogeneous and heterogeneous nucleation with silver nanoparticles. The synthesis of Ag nanoparticles was carried out by chemical reduction of silver nitrate (AgNO3) with sodium borohydride (NaBH4). In the case of homogeneous nucleation, colloidal solution of Ag nanoparticles at concentrations of 1, 2 and 4 parts per million was added and magnetically mixed with the porous material. With respect to heterogeneous nucleation, a solution of clinoptilolite and silver nitrate (0.01 M) was prepared and stirred; subsequently, the reduction of Ag was possible due to the addition of an aqueous solution of sodium borohydride. For the structural characterization, transmission electron microscopy (TEM), X-ray diffraction (XRD) and infrared spectroscopy (IR) techniques were carried out. The results were compared and discussed in both types of nucleation.

scholarly journals Pushing the Limits of Neutral Organic Electron Donors: A Tetra(iminophosphorano)-Substituted Bispyridinylidene

2015 ◽  
Vol 54 (38) ◽  
pp. 11236-11239 ◽  
Author(s):  
Samuel S. Hanson ◽  
Eswararao Doni ◽  
Kyle T. Traboulsee ◽  
Graeme Coulthard ◽  
John A. Murphy ◽  
...  
Keyword(s):  
Electron Donors ◽  
Organic Electron
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