Influence of Experimental Parameters on the Synthesis of Gold Nanoparticles by Electroless Deposition

2011 ◽  
Vol 324 ◽  
pp. 125-128
Author(s):  
Mikhael Bechelany ◽  
Jamil Elias ◽  
Jihane Hankache ◽  
Pierre Brodard ◽  
Laetitia Philippe ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electroless Deposition ◽  
Au Nanoparticles ◽  
Synthetic Route ◽  
Galvanic Displacement ◽  
Synthetic Process ◽  
Wide Range ◽  
Experimental Parameters ◽  
First Time

We report a simple synthetic route based on electroless deposition (galvanic displacement) and natural lithography to synthesize organized Au nanoparticles (NPs). We will study the influence of different experimental parameters (time, temperature, pH and additives) on the synthetic process. We show for the first time the formation of organized extended domains of Au nanorings using gelatin as an additive. A wide range of applications can be envisaged for these nanostructures, as for instance chemical- and bio-sensors using the SERS effect.

Enhancement of efficiency in graphene/porous silicon solar cells by co-doping graphene with gold nanoparticles and bis(trifluoromethanesulfonyl)-amide

2017 ◽  
Vol 5 (35) ◽  
pp. 9005-9011 ◽  
Author(s):  
Ju Hwan Kim ◽  
Dong Hee Shin ◽  
Ha Seung Lee ◽  
Chan Wook Jang ◽  
Jong Min Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Solar Cells ◽  
Porous Silicon ◽  
Au Nanoparticles ◽  
Silicon Solar Cells ◽  
Porous Si ◽  
Co Doping ◽  
Si Solar Cells ◽  
First Time

The co-doping of graphene with Au nanoparticles and bis(trifluoromethanesulfonyl)-amide is employed for the first time to enhance the performance of graphene/porous Si solar cells.

Iron-Promoted Construction of Indoles via Intramolecular Oxidative C–N Coupling of 2-Alkenylanilines Using Persulfate

Synthesis ◽  
2019 ◽  
Vol 51 (16) ◽  
pp. 3085-3090
Author(s):  
Menglan Wang ◽  
Yudong Li ◽  
Qing-An Wu ◽  
Shuping Luo ◽  
Yuehui Li
Keyword(s):  
Intramolecular Cyclization ◽  
Synthetic Route ◽  
Cyclization Reactions ◽  
Wide Range ◽  
First Time ◽  
Drug Intermediates

Indole scaffold synthesis relies primarily on oxidative C–H amination of N-protected alkenylanilines for C–N intramolecular cyclization reactions. Herein, for the first time, without N-protection, various readily prepared 2-alkenylanilines were transformed into the desired indole products in good yields by using K2S2O8 as oxidant in the presence of catalytic amounts of FeF2. The K2S2O8/FeF2 system offers a direct and benign synthetic route to 3-arylindoles and it is applicable to a wide range of substituted indoles including drug intermediates.

scholarly journals Electrochemical preparation system for unique mesoporous hemisphere gold nanoparticles using block copolymer micelles

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8309-8313 ◽  
Author(s):  
Hyunsoo Lim ◽  
Tomota Nagaura ◽  
Minjun Kim ◽  
Kenya Kani ◽  
Jeonghun Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Electrochemical Reduction ◽  
Au Nanoparticles ◽  
Electrochemical Preparation ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Self Assembled ◽  
First Time

Mesoporous hemisphere Au nanoparticles using self-assembled micelles, for the first time, are demonstrated by using electrochemical reduction on a Ti substrate.

scholarly journals Addition of Zn during the phosphine-based synthesis of indium phospide quantum dots: doping and surface passivation

2015 ◽  
Vol 6 ◽  
pp. 1237-1246 ◽  
Author(s):  
Natalia E Mordvinova ◽  
Alexander A Vinokurov ◽  
Oleg I Lebedev ◽  
Tatiana A Kuznetsova ◽  
Sergey G Dorofeev
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Particle Growth ◽  
Colloidal Quantum Dots ◽  
Synthetic Route ◽  
Zn Doping ◽  
Photochemical Etching ◽  
Wide Range ◽  
Dopant Atoms ◽  
First Time

Zinc-doped InP(Zn) colloidal quantum dots (QDs) with narrow size distribution and low defect concentration were grown for the first time via a novel phosphine synthetic route and over a wide range of Zn doping. We report the influence of Zn on the optical properties of the obtained quantum dots. We propose a mechanism for the introduction of Zn in the QDs and show that the incorporation of Zn atoms into the InP lattice leads to the formation of Zn acceptor levels and a luminescence tail in the red region of the spectra. Using photochemical etching with HF, we confirmed that the Zn dopant atoms are situated inside the InP nanoparticles. Moreover, doping with Zn is accompanied with the coverage of the QDs by a zinc shell. During the synthesis Zn myristate covers the QD nucleus and inhibits the particle growth. At the same time the zinc shell leads to an increase of the luminescence quantum yield through the reduction of phosphorous dangling bonds. A scenario for the growth of the colloidal InP(Zn) QDs was proposed and discussed.

scholarly journals Novelty Au Nanoparticles with Different Nano Sizes as an Acidity Sensor

2021 ◽  
Vol 31 (3) ◽  
pp. 167-173
Author(s):  
Zehraa Najim Abdul-Ameer
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Energy Gap ◽  
Uv Spectroscopy ◽  
Ph Sensor ◽  
Spherical Shape ◽  
Optical Energy Gap ◽  
Covalent Bonds ◽  
Wide Range

The amazing wide range, applications of gold nanoparticles corresponding to excellent optical and electronic properties enhance utilization of Au NP as PH sensor. Gold nanoparticles were synthesized in simple and rapid Turkevich method to accomplish optical sensing technologies covalent or non-covalent, bonds formation causes, aggregation of the nanoparticles in the target substance. Au nanoparticles characterization was studied using XRD, UV-spectroscopy and SEM. XRD indicate polycrystalline. Nanoparticles with two different sizes according to reducing agent amount to obtain 20 30 nm. Optical energy gap was calculated for both particle size to find it (2.13) eV for 30nm particle size and (2.33) eV for 20nm.Scanning Electron Microscope showed spherical shape particles. PH test were performed to investigate efficiency of Au Np’s for PH sensor and that is found to be excellent results for both sizes with more efficiency for 30 nm due to its rough surface. Which is a fantastic tool and measurement device to test the pH of soil, food, and other puncture-worthy applications.

scholarly journals Morphology-Tailored Gold Nanoraspberries Based on Seed-Mediated Space-Confined Self-Assembly

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1202 ◽  
Author(s):  
Yan Yu ◽  
Yujun Xie ◽  
Pan Zeng ◽  
Dai Zhang ◽  
Rongqing Liang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Near Infrared ◽  
Sio2 Nanoparticles ◽  
Uniform Size ◽  
Synthetic Process ◽  
Precise Control ◽  
Wide Range ◽  
Plasmon Resonances ◽  
Seed Mediated

Raspberry-like structure, providing a high degree of symmetry and strong interparticle coupling, has received extensive attention from the community of functional material synthesis. Such structure constructed in the nanoscale using gold nanoparticles has broad applicability due to its tunable collective plasmon resonances, while the synthetic process with precise control of the morphology is critical in realizing its target functions. Here, we demonstrate a synthetic strategy of seed-mediated space-confined self-assembly using the virus-like silica (V-SiO2) nanoparticles as the templates, which can yield gold nanoraspberries (AuNRbs) with uniform size and controllable morphology. The spikes on V-SiO2 templates serve dual functions of providing more growth sites for gold nanoseeds and activating the space-confined effect for gold nanoparticles. AuNRbs with wide-range tunability of plasmon resonances from the visible to near infrared (NIR) region have been successfully synthesized, and how their geometric configurations affect their optical properties is thoroughly discussed. The close-packed AuNRbs have also demonstrated huge potential in Raman sensing due to their abundant “built-in” hotspots. This strategy offers a new route towards synthesizing high-quality AuNRbs with the capability of engineering the morphology to achieve target functions, which is highly desirable for a large number of applications.

UV-driven overall water splitting using unsupported gold nanoparticles as photocatalysts

2018 ◽  
Vol 54 (15) ◽  
pp. 1845-1848 ◽  
Author(s):  
Bining Tian ◽  
Qin Lei ◽  
Bin Tian ◽  
Wenxing Zhang ◽  
Yanxia Cui ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Water Splitting ◽  
Au Nanoparticles ◽  
Overall Water Splitting ◽  
First Time

UV-driven water splitting was achieved over Au nanoparticles (>10 nm) for the first time without the assistance of cocatalysts.

Observation of uniform ligand environments and 31P–197Au coupling in phosphine-terminated Au nanoparticles

2016 ◽  
Vol 52 (58) ◽  
pp. 9020-9023 ◽  
Author(s):  
Lauren E. Marbella ◽  
Scott E. Crawford ◽  
Michael J. Hartmann ◽  
Jill E. Millstone
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
First Time

Phosphine-terminated gold nanoparticles exhibit unexpectedly uniform ligand environments that enable the identification of 31P–197Au coupling for the first time in these systems.

Safety assessment of biological raw materials in the system of medicines quality assurance

2020 ◽  
pp. 63-72
Author(s):  
Yu. Olefir ◽  
E. Sakanyan ◽  
I. Osipova ◽  
V. Dobrynin ◽  
M. Smirnova ◽  
...  
Keyword(s):  
Raw Materials ◽  
State Level ◽  
The State ◽  
Spongiform Encephalopathy ◽  
Safety Standards ◽  
Wide Range ◽  
The Russian Federation ◽  
Key Aspects ◽  
First Time ◽  
Medicines Quality

The entry of a wide range of biotechnological products into the pharmaceutical market calls for rein-forcement of the quality, efficacy and safety standards at the state level. The following general monographs have been elaborated for the first time to be included into the State Pharmacopoeia of the Russian Federation, XIV edition: "Viral safety" and "Reduction of the risk of transmitting animal spongiform encephalopathy via medicinal products". These general monographs were elaborated taking into account the requirements of foreign pharmacopoeias and the WHO recommendations. The present paper summarises the key aspects of the monographs.

Synthesis of a silymarin-gold nanoparticle conjugate and analysis of its liver-protecting activity

2021 ◽  
Vol 22 ◽  
Author(s):  
Sergey Staroverov ◽  
Sergey Kozlov ◽  
Alexander Fomin ◽  
Konstantib Gabalov ◽  
Alexey Volkov ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liver Disease ◽  
Carbon Tetrachloride ◽  
Glutathione Depletion ◽  
Laboratory Animals ◽  
Experimental Hepatitis ◽  
Acute Liver Disease ◽  
The Mean ◽  
Extent Of Damage ◽  
First Time

Background: The liver disease problem prompts investigators to search for new methods of liver treatment. Introduction: Silymarin (Sil) protects the liver by reducing the concentration of free radicals and the extent of damage to the cell membranes. A particularly interesting method to increase the bioavailability of Sil is to use synthesized gold nanoparticles (AuNPs) as reagents. The study considered whether it was possible to use the silymarin-AuNP conjugate as a potential liver-protecting drug. Method: AuNPs were conjugated to Sil and examine the liver-protecting activity of the conjugate. Experimental hepatitis and hepatocyte cytolysis after carbon tetrachloride actionwere used as a model system, and the experiments were conducted on laboratory animals. Result: For the first time, silymarin was conjugated to colloidal gold nanoparticles (AuNPs). Electron microscopy showed that the resultant preparations were monodisperse and that the mean conjugate diameter was 18–30 nm ± 0.5 nm (mean diameter of the native nanoparticles, 15 ± 0.5 nm). In experimental hepatitis in mice, conjugate administration interfered with glutathione depletion in hepatocytes in response to carbon tetrachloride was conducive to an increase in energy metabolism, and stimulated the monocyte–macrophage function of the liver. The results were confirmed by the high respiratory activity of the hepatocytes in cell culture. Conclusion: We conclude that the silymarin-AuNP conjugate holds promise as a liver-protecting agent in acute liver disease caused by carbon tetrachloride poisoning.

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